MAKING AND USING LARGE DIAMETER LAPS

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Design of a easy to make large diameter ID lap system. Showing all the machining steps of making two new sizes of lap rings. And lapping two D2 tool steel parts at 60 RC hardness using these laps and diamond slurry.
Paypal donation www.paypal.com...
Support through Patreon / robrenz
I am "robinrenzetti" Instagram lots more content there!
Great synopsis of the video by brs_workshop
"Shop Notes"*
• Explanation of project and overview of the lap design
• Facing and turning the lap
• Creating the reliefs with the DRO bolt pattern function
• Cutting the flexure slits with the bandsaw
• De-burring with a pencil type air grinder (looks like a Dotco model).
• Blue Moly links:
McMasterCarr: www.mcmaster.c...
Amazon: www.amazon.com...
• Turning and cutting the grooves
• TapMagic Aluminum:
McMasterCarr: www.mcmaster.c...
KBC Tool: www.kbctools.c...
• Lapping the parts with 15µ diamond
• Aerosol lube is Stoner brand lube with PTFE (not surprising, it cannot be sold in California).
Stoner's website: www.criticalcle...
• 3M 467 Adhesive Transfer tape:
McMasterCarr (60yd): www.mcmaster.c...
Amazon (.5 in/20yd): www.amazon.com...
(other sizes): www.amazon.com...
3M's website: www.3m.com/3M/...
• Using inside mics as a measurement transfer tool with outside mics
• Crack in D2 stock
*Not affiliated with any manufacturer or distributor. Links for convenience.

Опубликовано:

28 сен 2024

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Комментарии : 391

@martinmurrell5924 4 года назад

I just wanted to say "THANKS!", this is a great video, and I used much of your design in building an arbor to lap a new Big End into a vintage motorcycle I am rebuilding. I worked perfectly. I could not have done it without all your clear instruction. Thanks so much!!!!!

@ROBRENZ 4 года назад

Glad to hear it!

@chuckturner6984 8 лет назад

Hi Robin. I absolutely love watching the lapping videos. Tom Lipton's edge finder was the first one I watched. I am a carpenter and we go down to 1/32" with our measurements. I love seeing that you guys can get to absolute accuracy, as absolute as the measuring tools will measure, anyway. Please continue your videos. Thanks.

@ROBRENZ 8 лет назад

Thanks Chuck glad you are enjoying them. Thanks for commenting and watching! Robin

@Tjousk 8 лет назад

I most certainly found this interesting. Your videos continue to be rather information dense compared to most others I watch. Keep it up.

@ROBRENZ 8 лет назад

Thanks tjousk and thanks for commenting and watching! Robin

@stevenshaw9559 8 лет назад

Thank you robin, I am still very young in the trade and your videos have helped me advance my skill tremendously

@ROBRENZ 8 лет назад

That is great to hear Steven, that is my motivation in doing this so thanks for the engouragement! Robin

@jurskas7965 8 лет назад

Thank you for the video. You don't find much knowledge available on subjects such as lapping, I am glad your willing to share.

@ROBRENZ 8 лет назад

Thanks Jurs and thanks for commenting and watching! Robin

@sblack48 8 лет назад

I've never seen anything like this. Amazing.

@ROBRENZ 8 лет назад

Thanks scott and thanks for commenting and watching! Robin

@philmay7834 4 года назад

I know nothing about any of this, but find it really interesting and it makes a great watch.......almost calming in a way. What I’ve gathered from watching quite a few hours over the past week is that very little of what we take for granted would be possible without this process. And to think that my father started out as an apprentice machinist for CN Rail back in the steam days. Glad I found this site, and others, dedicated to the machinists art.

@johnneundorf1585 4 года назад

Its a real pleasure watching someone of your caliber make stuff...well done Robin.

@forrestaddy9644 8 лет назад

MOST interesting and informative. Among the weaknesses in my technical lore is gage lapping (and metallurgy and gear metrology and...) Many thanks for the revelations. I imagine external laps are designed much the same but inside out with a consricting bolt.

@ROBRENZ 8 лет назад

Thanks Forrest, an example of small external lapping is in the Custom Calipers Part 1video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-5RZw5bJd5TQ.html Thanks for commenting and watching! Robin

@glennfelpel9785 8 лет назад

you sure do keep things interesting! It sure is nice to be able to learn and enjoy doing it.Thank you for sharing, this is fascinating.

@ROBRENZ 8 лет назад

Thanks for the encouraging words Glenn and thanks for watching! Robin

@pierresgarage2687 8 лет назад

Hi Robin, Not so familiar with the ultra finishing work, learning a lot from what you show. This is where RU-vid is at it's best, keep the great projects coming, it doesn't make us rich but at least we have fun... lol ATB, Pierre

@ROBRENZ 8 лет назад

Thanks Pierre, Lots more to come. ATB, Robin

@Steve_Just_Steve 8 лет назад

Always love to see a new one pop up from you Robin and always always learn a ton! Looking forward to the more in depth lapping video. Thanks again for sharing another awesome skill with us.

@ROBRENZ 8 лет назад

Thanks Steve and thanks for commenting and watching! Robin

@xmachine7003 3 года назад

The lessons I get every time I watch your videos,PRICELESS. THANK YOU ROBIN, Chuck.

@ROBRENZ 3 года назад

Glad you like them!

@xmachine7003 3 года назад

@@ROBRENZ look up Dan Gelbart. He built a lathe,grinder. Air bearings. Interesting.

@ROBRENZ 3 года назад

@@xmachine7003 I have watched them all!

@xmachine7003 3 года назад

@@ROBRENZ 😂😂of course you have.😉

@alexkern9134 8 лет назад

Looking forward to more videos on lapping, especially interested in lapping parts parallel, like gage blocks. Also looking forward to the stoning video. I liked how you used the lathe to groove the laps. Awesome video Robin. Thanks, Alex

@ROBRENZ 8 лет назад

Thanks Alex, there seems to be a great interest in lapping so much more to come. That lathe grooving was done before you could even think about taking the part to a mill ; ) Thanks for commenting and watching! Robin

@McFingal 8 лет назад

Fantastic information, it's always nice learning something new.

@ROBRENZ 8 лет назад

Thanks, glad it was informative. Thanks for commenting and watching! Robin

@bcbloc02 8 лет назад

I feel more precise already!

@ROBRENZ 8 лет назад

Glad its working for you bcblock! Robin

@totalcardetailing2022 4 года назад

Great job!! I know what you mean about never drilling into a parallels. I think we all have seen someone else do it one time lol.

@billdlv 8 лет назад

Nice work Robin, very interesting on the lapping. I enjoy seeing all the mods to your lathe too, I have an AML-618 in the shop.

@ROBRENZ 8 лет назад

Thanks Bill, I will do some videos on the lathe mods. Thanks for commenting and watching! Robin

@matter9 8 лет назад

As always another great video! Thanks for taking the time to share your experience.

@ROBRENZ 8 лет назад

Thanks Spencer and thanks for commenting and watching! Robin

@rtwolfrt 7 лет назад

Great videos mate, moves along at a good pace and lots of technical details.

@ROBRENZ 7 лет назад

Thanks Rhys and thanks for watching and commenting!

@StefanGotteswinter 7 лет назад

What puzzled me for quite some time now: How do you handle singlepoint threading on the Hardinge without the compound? Do you have another trick up your sleeve or is that just something that does not come up very much in your work? Same question for tapers, do you use a taper attachement or do you put the compound back on? I like the sturdy look of the lathe without the compound and the fact that it makes drilling with the carriage so easy..

@ROBRENZ 7 лет назад

Single point threading works just fine using a straight infeed of the cross slide for the size threads I commonly do (16TPI and smaller). Most of the materials I use are 416 SS, A2 tool steel, and Aluminum, all which thread very nicely with the straight infeed. I can put the compound back on when I need to and I do have the taper attachment for the lathe. Most short tapers I do with lapped straight tool set on the angle I need and just plunge the angle. Tools are extremely more rigid when the compound is gone so you can do things not possible before. Like plunge a 1" wide form tool with no chatter. BUT now that I have a CNC lathe in the shop I will probably never mess with the compound on the Hardinge for a (non between centers) taper ever again. Thanks for commenting Stefan and keep up your great work!, ATB, Robin

@yosmith1 8 лет назад

Fascinating process, Robin! Thanks for sharing

@ROBRENZ 8 лет назад

You are welcome Neil and thanks for commenting and watching! Robin

@travisshrewsbury7169 8 лет назад

great video as always, brilliant work

@ROBRENZ 8 лет назад

Thanks Travis and thanks for commenting and watching! Robin

@StefanGotteswinter 8 лет назад

Great video, Lapping is something I have not done very much, but I find it a very interesting process - Its hard to find good literature on it. Any chance of getting a shop tour? You seem to have some interesting machinery :)

@ROBRENZ 8 лет назад

Thanks Stefan, there seems to be a great interest in lapping so much more to come. I wont do a shop tour but I promise you will see everything in minute detail eventually. Thanks for commenting and watching! Robin

@gandersson6121 8 лет назад

you have a wealth of knowledge Robin. and thanks for sharing it!

@ROBRENZ 8 лет назад

Thanks Georg and you are welcome. Thanks for commenting and watching! Robin

@Kettletrigger 8 лет назад

Another great vid...looking forward to more info on lapping. Would also love a detailed tour of your lathe. That HLV-H is the stuff of dreams. I may never own one, but I'd sure like to see more of it!

@ROBRENZ 8 лет назад

Thanks Kettletrigger, I will do some videos on the lathe mods. Thanks for commenting and watching! Robin

@Latheman666 8 лет назад

Great video. Thanks for sharing.

@ROBRENZ 8 лет назад

Thanks Latheman666 and thanks for commenting and watching! Robin

@davidcolwill860 8 лет назад

Fantastic videos. Please keep them coming!

@ROBRENZ 8 лет назад

Thanks David, plenty more to come and thanks for commenting and watching! Robin

@barrygerbracht5077 8 лет назад

What did you do with the crack? Was it OK to just leave it? I like your videos. No BS, just high end professional machining showing your expertise. Lots to learn from.

@ROBRENZ 8 лет назад

Thanks Barry, yes it was ok to just leave it. Glad you are enjoying the content. Thanks for commenting and watching, Robin

@mikewalton5469 8 лет назад

very fine work! it was very interesting as well as inspirational

@ROBRENZ 8 лет назад

Thanks m Walton, glad you liked it and thanks for commenting and watching! ATB, Robin

@1jtolvey 8 лет назад

GREAT VIDEO !!! ANOTHER HOME-RUN !

@ROBRENZ 8 лет назад

Thanks OLD WIPPER-SNAPPER, and thanks for commenting and watching! Robin

@sharpx777 8 лет назад

very interesting, thanks for sharing. wouldn't mind seeing a tour of your lathe and maybe the way you did your fix toolpost (if you ever get around to do it).

@ROBRENZ 8 лет назад

Thanks sharp x I will do some videos on the lathe mods. Thanks for commenting and watching! Robin

@mudnducs 9 месяцев назад

I did. Very interesting…thank you!

@lensman5762 6 лет назад

Incredible level of skill and craftsmamnship. Well beyond my ability as an amateur model engineer with minature lathes and mills.

@wallacesaan 8 лет назад

Really beautiful work!

@ROBRENZ 8 лет назад

Thanks wallacesaan. ATB, Robin

@dartzt1 7 лет назад

Thank you so much! Great video! From a novice perspective its great to watch an expert.....thanks for sharing!

@ROBRENZ 7 лет назад

You are welcome, Thanks for watching and commenting!

@warcube91 7 лет назад

Amazing video. I just discovered your channel through you doing the level work with Tom Lipton. You do some truly amazing work. My job is as quality control for an automotive transmission parts supplier and seeing you do gage level work is just mind blowing to me. I hope to see you doing many more videos!

@ROBRENZ 7 лет назад

Thanks, I will be back at it in Jan 2017. Thanks for watching and commenting!

@glenlynch9765 8 лет назад

lapsed a taper lock bushing into a steel roller. I had deep tool marks so it didn't come out very good. But it seems to lock onto the shaft ok. Thanks for the video as I need to learn more about lappinv.

@ROBRENZ 8 лет назад

Thanks for commenting and watching Glen! Robin

@metlmuncher 7 лет назад

Very nicely done. I really appreciate you making vids like this.. I also need to get me some of that tape to have around. It looks indispensable

@ROBRENZ 7 лет назад

Thanks Adam and thanks for watching and commenting!

@gertskjlstrup1804 8 лет назад

very very nice, thanks for showing!

@ROBRENZ 8 лет назад

Thanks Gert and thanks for commenting and watching! Robin

@larrysnell1891 5 лет назад

Thank you. This was very helpful for me. Was starting to use some brass barrel laps and got a lot of pointers and ideas! Great education!

@jorgescordamaglia1654 8 лет назад

Great video Rob for a useful tool. I noticed a mod on your tool post that I've been thinking to make. To have a solid attachment for it by removing the top slide that in fact is hardly used. If you could ever give us a tour of your shop and equipment would be great. Cheers Jorge

@ROBRENZ 8 лет назад

Thanks Jorge, you wont be sorry you got rid of the compound slide when it comes to rigidity and repeatability. No shop tour but I promise you will eventually see it all in detail. Thanks for commenting and watching! Robin

@floodo1 8 лет назад

In a comment in another video Rob talks about having a few dozen tool holders with known Z heights so he can swap between tools without having to re-zero because of the solid toolpost!

@pbmachines972 7 лет назад

I watch using a large lap again very interesting thanx for sharing your knowledge

@ROBRENZ 7 лет назад

Thanks PB Machines and thanks for watching and commenting!

@bundylovess 8 лет назад

Nice job big thumbs up

@ROBRENZ 8 лет назад

Thanks Alan and thanks for commenting and watching! Robin

@isidoromaich7226 8 лет назад

Very interesting Sir! thanks for sharing it with us.

@ROBRENZ 8 лет назад

Thanks Isidoro and thanks for commenting and watching! Robin

@andreymitin7911 3 года назад

Хорошая идея с щитком у резцедержки на токарном станке.

@JanMuell42 8 лет назад

Well, I was about to fall asleep but I guess that has to wait for 23 minutes :)

@ROBRENZ 8 лет назад

That is my goal Jan, If you blink you will miss something important! Thanks for commenting and watching! Robin

@jsmith6821 7 лет назад

Rob: really enjoyed the large dia lapping; super cool tool ideas ! J Smith

@ROBRENZ 7 лет назад

Thanks J and thanks for watching and commenting!

@tek4 8 лет назад

good vid, I did find it interesting

@ROBRENZ 8 лет назад

Thanks tek413 and thanks for commenting and watching! Robin

@clarhettcoalfield3616 7 лет назад

Just wow, this was so cool to watch.

@ROBRENZ 7 лет назад

Glad you liked it.

@MrJugsstein 7 лет назад

Very nice Robin all ways a pleasure looking forward to see more. Tks Will

@ROBRENZ 7 лет назад

Thanks, and thanks for watching and commenting!

@daki222000 8 лет назад

great video, thanks for sharing. cheers.

@ROBRENZ 8 лет назад

Thanks Flip de boer, thanks for commenting and watching! Robin

@ivanpetrov8600 4 года назад

Amazing work! Thank you very mach, Maestro!

@hebrewhammer1000 7 лет назад

Wow amazing video. Keep up the great work. thanks you.

@ROBRENZ 7 лет назад

Thanks Zane and thanks for watching.

@886014 8 лет назад

Nice one Robin, bad luck on the crack, but it sounded as if it didn't affect this part. I have also used aluminium laps and find they hold the diamond just fine. I've found the cast iron laps wear better however. I don't bother cutting any scores in the lap as I don't think that is important with diamond; the particles are too fine. However I use diamond paste which is also far less messy. Once the lap is properly charged it doesn't need to be renewed constantly. Personally I would have flipped that part and lapped it from the other side if possible. Although the bearing surface is not as good to hold it, more of the lap could have been used, as it was cutting on the end of it. It would help to prevent the lap wearing tapered. You did very well to get an ID hard turned to that tolerance. I've never needed to do any hard boring, but there's a lot of pressure on external hard turning from my (limited) experience of doing it. I've had good experience with cermets with OD hard turning and am interested in what you used for the ID?

@ROBRENZ 8 лет назад

Thanks Pete, The one larger lap I showed in the beginning was iron and I agree they wear better. I like the grooves for lube/slurry distribution and swarf removal but I agree they are not essential. Yes a well charged lap can go along way before needing more diamond. The video may have given the impression I was only using slurry but I was using kerosene in a lot of the off screen lapping to remove all the swarf. The lap was able to pass clean thru the bottom of the part going between the vise jaws so I was keeping the lap nice and cylindrical by how I was stroking it. I use "used" cbn throw away inserts that I braze onto shanks or onto standard inserts and then I grind and lap a new cutting edge. They work very well and are resharpenable many times. I do lots of hard turning and boring on the Hardinge. and on smaller diameters like 1.5" and under I can hold +/- .0001" easily on production parts. The large diameters are a problem because the mileage the insert sees per part is huge and the wear that I might chase on 20 small parts adjusting after every part happens during the single large part. All the best, Robin

@886014 8 лет назад

Good one, thanks for that. It sounds like a PIA on semi-production work. I'd be interested in seeing some photos of that tool if it should happen to make a cameo appearance in one of your videos. Your viewers would probably also be similarly interested in seeing some video of your hard boring too. The closest I've come to "hard boring" would relate to the difficulty of the "hard" part, and "boring" is the rate of stock removal!!! At least on my noodle. The finish kicks butt however, and it's almost worth the price of admission for that gee-wizz factor alone!

@ROBRENZ 8 лет назад

I am already collecting clips for a hard turning video!

@oh8wingman 5 лет назад

A great tutorial and I thank you. Could you do a video showing how to fabricate an external lapping tool for doing shafts in a lathe?

@ROBRENZ 5 лет назад

watch my Deckel clone modification video

@oh8wingman 5 лет назад

@@ROBRENZ Thank you I will.

@gilbertodiazcastro8871 8 лет назад

Great video. I'm a machining student and haven't had to do any lapping, this sure will make it easier since now I know how to make custom-sized lapping tools. I also like that your videos go directly to the task being shown, no twenty minutes of boring talk and five minutes of actual machining. Very professional. Thanks.

@ROBRENZ 8 лет назад

Thanks Gilberto, glad you are finding the content useful. Thanks for commenting and watching. ATB, Robin

@joshmedarac8585 7 лет назад

At one point you mentioned cleaning up a shars chuck to make it run a little nicer. Any chance we can see what exactly you had to do? I do like the channel and the content is great. It's going to be a few days before I get caught up.

@ROBRENZ 7 лет назад

Thanks Josh, I have some video and pics on the chucks. I just need time to edit and post.

@ericw867 2 года назад

Hi Rob do you have any suggestions for small O.D. lapping. I can make whatever I need but I don't see a lot out there for O.D. lapping below inches or more in diameter. Namely I'm interested in lapping edgefinders of 5/8 O.D.. or less. Thank you for your channel

@kevlar_87 8 лет назад

Really nice craftsmanship, thanks for sharing Rob. I was interested in the import 3-jaw Chuck, you mentioned re-working and modifying. Do have a video talking more about it? If not, I think that would be a great diy improvement for many people. I always learn something from your videos : )

@ROBRENZ 8 лет назад

Thanks Kev Lar, I didn't do a video but it was mostly cleaning and deburring all the parts. Thanks for watching and commenting!

@somebodyelse6673 8 лет назад

Do you recall what manner of things weren't the cleaning and deburring? I've arrived at the conclusion that import tools / machines are better regarded as kits, but I'm kind of afraid of running into spots where the sloppy manufacturing can't be corrected without adding bushings or shims, etc. I don't have the experience to know how doing things like that will affect rigidity, accuracy, durability, and such. For hobby machinists with more time than money, advice from your level of expertise would be invaluable for avoiding 'hobby ending' debacles that were doomed from the start.

@3rcamera 7 лет назад

Thank you Robin for making and sharing these video's. I also noticed you have a third bolt on the fix jaw of your milling vise. Is that for rigidity? Did you try to taper fix jaw for hold down? Radu

@ROBRENZ 7 лет назад

You are welcome Radu, that is a 1/2-13 tapped hole to use my clamp & stud set for holding long pieces down tight on the vise bottom. Thanks for watching and commenting.

@jeffreylehn8803 7 лет назад

thanks for making these video's

@ROBRENZ 7 лет назад

You are welcome Jeffrey and thanks for watching and commenting!

@pbmachines972 7 лет назад

Nice work Rob you could use some T handle ball ends

@ROBRENZ 7 лет назад

Thanks PB I may get some and thanks for watching and commenting!

@peterthannhauser2225 8 лет назад

Excellent video! Some questions:- 15 microns, that's about 1200 grit equivalent? And that yielded that final mirror finish?- what do you figure was the total material removal through this particular lapping operation?- what was the aluminum alloy? (or does it really matter?)- do you make the diamond slurry yourself from powder, or buy it that way?- you mentioned preferring diamond being cleaner & cutting action (presumably over more traditional 'grease' pastes like silicon carbide). I've heard it can be a bugger dislodging from the part itself if under a certain hardness number. Do you have experience or rule of thumb in this regard?- (newby question) what exactly do you mean by 'hard turning'? Regular carbide lathe cutting tools or some other removal process?

@ROBRENZ 8 лет назад

Thanks Peter. A soft lap like aluminum will give a finer finish than a harder lap like iron. 4" dia. x about 1.5 length that was oversize x .00025" radial material is .0047 cubic inches removed. Not sure on the alloy but probably 6061-T651 and it does not amake a big difference unless it was 7075. Slurry is purchased. Silicon carbide would have taken 2 to 3 times longer to get the same results. As I mentioned it can be a nightmare when your part is not much harder than the lap. If the particles charge into the part you are in trouble. I use CBN tools to hard turn and I am doing a video on that soon. Robin

@gernoff666 8 лет назад

Missed it in the video but your using 15 micron diamond powder in the slurry? Slurry in oil or water? Thanks for the info. BTW voice over is the obvious way to go. I really like how your videos progress w/o a bunch of umms and dead time, just a nice quick description of the process. I'd be willing to pay a subscription to watch surface grinding videos on your channel.

@xyzzyx6468 7 лет назад

Peter, with relatively medium size grit you can get mirror finish, because lap is soft and material is hard (it's D2). Diamond makes better, cleaner, more consistent cuts and gives better geometry after. Example (read user Pumaracing post): www.pistonheads.com/gassing/topic.asp?t=980840

@87FordMudder 8 лет назад

Absolute top quality work. Do you find any disadvantages with aluminum laps as compared to brass? Also, what kind of apron are you using? That pocket configuration looks pretty handy.

@ROBRENZ 8 лет назад

Thanks Duncan, I find the aluminum and brass behave much the same but aluminum is much cheaper and on a lap this size that is a big deal. That is a purchased apron but I sewed right through the left pocket turning it into 3 slots and the right into 2 slots. ATB, Robin

@mesuthan 6 месяцев назад

Hello dear Robin, It has been 7 years since the video, but I want to ask in general, what geometric tolerances, cylindricity is what I wonder the most, could one get with the cylindrical lapping with the right technique and how does the lap material contribute to it?

@ROBRENZ 6 месяцев назад

With good technique, single digit micro inch tolerances.

@PhilsProjects 8 лет назад

in Awe :~))

@ROBRENZ 8 лет назад

Thanks Phil and thanks for commenting and watching! Robin

@rasmusb2523 8 лет назад

Recently found my way to your videos through Tom Lipton and I really appreciate what you share. Good amount of detail and some really interesting stuff you tackle. What did you do to that crack, did you have to redo the part seeing that the customer seemed to have a need for a good and lapped surface?

@ROBRENZ 8 лет назад

Thanks Rasmus B and thanks for commenting and watching! The crack did not cause any issues for the customer. ATB, Robin

@rcdieselrc 8 лет назад

Nice videos. What kind of indicator is that? I have a couple with the dovetail on top, but without the ratcheting tip, they point straight out. I have an old Federal 10ths with a ratcheting tip that I use for centering, but have to use a convoluted arm arrangement to hold it.

@ROBRENZ 8 лет назад

Thanks rcdieselrc, it is a Brown and Sharpe Best Test indicator and thanks for watching and commenting!

@pearcemachineshop5200 8 лет назад

Very interesting Rob what was the bore size to start with and the size of the lap you made to suit it, great film I take a lot from it always interesting a true craftsman always makes it look easy.Regards Alan.

@ROBRENZ 8 лет назад

Thanks Alan, the lap was turned about .0015" smaller than the bore which needed about .0005" lapped out to get it cylindrical and on size. Thanks for commenting and watching! Robin

@dsfs17987 7 лет назад

amazing work! I mean both on the part and the making of the video, and the throughout description of the process. p.s. would there be any benefit to cut the circular slurry slots in a spiral pattern? so when the lap is rotated, the screw action would push the slurry upwards?

@ROBRENZ 7 лет назад

Thanks, spiral would work great but not enough better to warrant setting up a thread

@Gottenhimfella 2 года назад

@@ROBRENZ On first reading, I thought, "yes, indeed", but on reflection: surely it's less work setting up a single-start thread than plunging lots of individual grooves? (obvious exception would be a lathe with no quick-change gearbox, like the change-wheel Myford I used to monopolise as a boy when my Dad was trying to learn model engineering.. Actually I think he was possibly feigning some of his apparent enthusiasm for becoming the oldest person to ever learn machining's dark arts, and it actually was a ruse to get *me* interested in engineering ... and if so, BOY did it work! ) I've still got his Myford, and other assorted lathes of all shapes and sizes... fifty years later.

@jameslamb4573 8 лет назад

Forgot to time that 5 minute video. Been running through some of your "back catalogue", it doesn't surprise me that you'd work on something as fiddly as an RC Helo. Do you sell decade resistance boxes?

@ROBRENZ 8 лет назад

Hi James, you can always run the video at .5 speed so it would seem like 10 minutes! I was making a run of 25 of the Versa Ohm box but lost momentum. I may finish them in the future. Thanks for commenting and watching! Robin

@mrcpu9999 6 лет назад

Just fascinating.

@stevegibson3113 7 лет назад

Would this process work on a smaller scale instead of reaming? Thinking more for odd sizes where you don't always have a reamer.

@ROBRENZ 7 лет назад

It works much easier on hardened materials and is only practical for removing

@xyzzyx6468 7 лет назад

In emergency situation you can lap the hole using lap and coarser grain, but this is not normal practice. Can be done, but not recommended, not effective timewise.

@greasydot 8 лет назад

Did you thin the lapping compound with Naphtha or alcohol?? My compound is a thick paste.

@ROBRENZ 8 лет назад

The lapping slurry comes already mixed as you saw it. You could thin your compound with WD40 or kerosene or very light oil.

@Jloyd18 6 лет назад

I made a set of flat laps at work and I have gotten to a point where the laps are starting to make gouges in each other with 3 micron diamond slurry. Is that do to too much pressure or too much viscosity? Thanks

@ROBRENZ 6 лет назад

Probably contamination or lack of diamond.

@christurley391 7 лет назад

So did the crack spoil the piece or will it still be useable?

@ROBRENZ 7 лет назад

Thankfully still usable.

@christurley391 7 лет назад

Fortunately internal flaws like that are pretty rare. Glad it didn't spoil your work.

@christurley391 7 лет назад

On second thought perhaps not rare so little of the work I've been involved in had such a fine finish. lol

@OldIronShops 8 лет назад

always have interesting stuff coming across the bench. hay where abouts are you located?

@ROBRENZ 8 лет назад

Southern PA Thanks for commenting and watching Chris! Robin

@OldIronShops 8 лет назад

+ROBRENZ ah I'm out in California lot far from Tom Lipton

@jae878 7 лет назад

Very interesting. Would have never thought aluminum would make a good lap. The way you explain it tho makes sense. Thx for the video.

@ROBRENZ 7 лет назад

You are welcome Jeff and thanks for watching and commenting!

@xyzzyx6468 7 лет назад

Almost any different (most of the time softer) material can be used as a lap. Depends on what you do, what industry, etc.

@Gottenhimfella 2 года назад

It used to be that laps for lapping soft materials (like brass or copper) were made of lead. Maybe someone who has actually done that might comment. It is certainly the case that the lap has to be signicantly softer than the workpiece, or the process will work the wrong way round.

@marceltimmers1290 8 лет назад

Hi mate. I had the same question as Barry, what did you do with that cracked piece. Does the retailer of that material reimburse you the costs of your labour and material?

@ROBRENZ 8 лет назад

Hi Marcel, in this case it did not matter but I could hear that crack when I was hard turning the bore. Thanks for commenting and watching! Robin

@EdgePrecision 8 лет назад

I want to thank you for going to the effort to make your videos. I subscribed to your channel not long ago( If memory serves me I think Tom on OXTOOLS recommended you on one of his videos). Your content is different than most RU-vid presenters. As a experienced machinist I have already seen things I can use in the future.

@ROBRENZ 8 лет назад

Glad you are finding useful content Edge Precision and thanks for commenting and watching! Robin

@andrewphillip8432 4 года назад

How much effort do you spend cleaning lapped parts before you measure them? I always wipe down with a paper towel before measurement but I am concerned that extremely fine abrasive on my hands and on the part will cause wear on my micrometer faces. Any thoughts on this?

@ROBRENZ 4 года назад

A lot, very important to have very clean parts or it will eat your measuring tools.

@bielanski2493 8 лет назад

Another good show! How long ago did your friend drill into that parallel? :)

@ROBRENZ 8 лет назад

Thanks Chris, I have a doozie that I will show in the future. Thanks for commenting and watching! Robin

@bielanski2493 8 лет назад

Subbed, too. Your lapping and scraping philo is candy to a part-timer like me that never got elbow deep

@punishr36 2 года назад

I see if the application is for a ring gauge where the bore does not need to be square to either end face and is only relevant to itself. In the case of your hub would it not be easier to first grind to maintain squareness and lap finish if needed? Especially working with a tapered bore and doing it on a vice in a mill would it's squareness not be compromised? Cheers Robin.

@ROBRENZ 2 года назад

You are correct.

@burakbozdagan3333 3 года назад

Dear ROBRENZ , Can we apply this application to graphite carbon material how can we apply it ? What should be roller material and abrasive?What can we do to graphite material for super finish if this application does not. Thank you.

@mryoutuser 7 лет назад

Very Nice, I like the internal mirror like finish, can grinding give the same results?

@ROBRENZ 7 лет назад

Thanks, yes but not practical.

@mdwdirect 8 лет назад

What did the client say about the crack?

@ROBRENZ 8 лет назад

No problem, these things get scratched up in use. Thanks mdwdirect for commenting and watching! Robin

@samrodian919 5 лет назад

Robin, was the part that was cracked scrap, or was it still able to be used by the customer?

@ROBRENZ 5 лет назад

Still useable.

@termlimit Год назад

What air tool did you show about the halfway point? Thanks for your videos!

@ROBRENZ Год назад

Dotco

@trialnterror 7 лет назад

Did you have to scrap the part that had the flaw in it? Is there any reference material that shows how to make the spot drill you made? Type of material, angles etc?

@ROBRENZ 7 лет назад

The part was ok with the crack in it. Material is a trashed spot drill. Just seat of the pants tool grinding on the geometry.

@nikolaradakovic5050 7 лет назад

Rob excuse me but did you say that this chuck is only 170 dollars?

@ROBRENZ 7 лет назад

Yes, Shars tool. They have higher quality chucks that are very inexpensive also.

@nikolaradakovic5050 7 лет назад

trialnterror thanks , it is really affordable. I will search it online

@poozandweeez 5 лет назад

ok so curious question, but could you achieve a consistent tolerance straight accurate part via cylindrical grinding the bore? or do you have that capacity? lapping bores seems like a long way to go about it. I usually machine/hard turn within a couple hundredths of finished size then finish grind.

@ROBRENZ 5 лет назад

I don't have a cylindrical/ID grinder. Lapping is slower but can give better geometry than grinding,

@poozandweeez 5 лет назад

@@ROBRENZ yeah i was going to try and do some lapping for our drawing dies, D2 steel as well, I've found the radial marks cause the tin plate to pick up on the surface finish, we don't have micro honing capabilities or even honing for that matter, but those internal laps look like a good solution.

@matthewhickey942 3 года назад

Your a cool dude

@cmguitar50 3 года назад

Rob, another great video. I like the narrative.. Does water based or oil based slurry matter? Sources of supply would be appreciated - thanks!

@ROBRENZ 3 года назад

No. Kemet, Amplex, Google "metalographic supplies"

@cmguitar50 3 года назад

@@ROBRENZ Thanks!

@Gottenhimfella 2 года назад

@@cmguitar50 Typo alert for anyone wishing to follow this up: Rob inadvertently left an “l” out of "metallographic "

@patricksworkshop6010 6 лет назад

Robin is there a drawbar that holds the chuck on the hardinge?

@ROBRENZ 6 лет назад

No, it is a 4 degree taper nose. I think my chuck stop video shows how it works.

@kundeleczek1 2 года назад

Is there any way to to improve parralelism of base to a hole of a part that you shown by lapping?

@ROBRENZ 2 года назад

I assume you mean perpendicularity and yes you could lap the face square to the bore.

@kundeleczek1 2 года назад

@@ROBRENZ Yes, I mean perpendicularity. Can you guild me please where I can look for information about that method?

@daiwangel 7 лет назад

This resembling motor cylinder rectifier?

@ROBRENZ 7 лет назад

Yes but more accurate and slower.

@redpilled3569 4 года назад

Do aluminum laps ware out fast?

@ROBRENZ 4 года назад

No.

@arnljotseem8794 7 лет назад

Hi Robin. What type of fluid is used in the slurry to suspend the diamond particles? I assume you mix it yourself from a powder or paste? Thanks for an interesting video. Second viewing and learning new stuff every time.

@ROBRENZ 7 лет назад

You can use WD40 and paste but that was purchased as slurry. If you buy slurry make sure you buy oil based not water based.

@DracoOmnia 7 лет назад

Cool looking tool, I like the method of allowing for some expanding and contracting throughout a cylindrical shape, similar movement to an exhaust tubing expander just one solid piece and much less movement, lol. Although, speaking of tubing expanders do you think you could use one as a lap or would it be too inaccurate? You'd have to machine some threads off in order to chuck it up but seems like it could work. At the end you mention something about a generalized lapping video... how's that coming along? :D

@ROBRENZ 7 лет назад

A lap that is meant to improve geometry (not just shine things up) must be fairly rigid in itself. The separate pieces of the expander would tend to follow whatever shape was there already instead of making the hole more round.The lapping video is on the long list.