Nicely done, I especially enjoyed the part where you got the chip breaker right and decided to quit before bozo showed up. I usually never quit until it is too late. lol
Hi Tom New to your vids.i was directed to you by BlondieHacks.I have a part to make involving surface grooves and thought back to my days as a machine operator when I used trepanning a lot. But that was back in the 60,s(not 1860)and it was all set up for me as an operator by the setter.Your video brings it all back beautifully. Thanks a lot and keep em coming.
awesome man saved my day literally. don`t need the ring but have to make a lot of o ring grooves. 100% agree on developing the skill of grinding hss and knowing how to homebrew cutting fluids too. thanks tom. take care. pete
Great video Tom! I use this technique making 4" dia. PET seals that are.08 cross section. I end up with a 3.62 dia, chunk of material left that other parts can be made from. ATB, Robin
Hey Robin, Do you grind yours at an angle similar to what I showed or do you sprinkle some Renzetti pixie dust on your to make them cut 20x depth? Thanks for stopping by. All the best, Tom
Hey Tom, I am lazy and I like carbide so I use the micro100 "LC" series brazed groove tools and just add about .010" back taper and radial clearance on one side of the tool. the rest is already ground. I orient the tool the same general direction you have yours with just a few thousandths of clearance tilt over the length of the carbide. Of course ceramic lapped with 3 micron on the cutting end. No chip breaker as I find it unnecessary at carbide speeds and flood coolant. ATB, Robin
Very interesting for me: not only to make rings and save material, but also to make frontal grooving, that is what i have to do now! So super thanks from Italy !! Alberto
I remember spending way too much time on trepanning tools when I was training.We were taught to leave as much material as possible for the 'outer' curve then 'match it' to diameter required but include 7 deg clearance. Our tutor could be a right ass sometimes. Setting 0.010"~0.015" above centre gives some extra clearance and sometimes a better cut. Angle grinder would have been a great thing to have back then
Nice demo, Tom. Very similar to how I do it, too. I use the same type of tool for a recurring job I do for a Coleman lantern parts business. If you look inside the fuel cap on an older (pre 1970) Coleman white gas lantern, you will see one of the types of parts I make for them. There is a brass insert inside the fuel cap, held in by a screw, and that brass insert has a groove for a rubber gasket. My tool grind to make that groove is so much like what you show here, but smaller, as needed. I just happen to have an order of 600 of those parts in the shop right now. Trepanning my can off. :) For some of the gents below who mentioned having a hard time cutting a chip breaker on the grinder, try holding your tool bit in a vise and use a Dremel tool with a thin grinder blade. It is a little easier to control, for me, anyway.
Thanks Tom, another excellent and informative video. I actually liked the no guard grinder, simply because they get in the way, and really, you're supposed to be in control of the tool, not the other way around.
Nicely ground toolbit. When i was an apprentice in RDN, I were only tought to grind toolbits. As you say, anything is possible, and even today, allmost 40 years on, I hardly ever uses an insert.
Thank you for the thorough explanation and example. My dad and I got talking about drills. I made a joke about the medical practice of trepanning and he said there was a similar workshop term using a lathe. Found your video and we both learned something today. This is really cool. Thanks.
That clears up a question I had for a long time. A friend gave me some HSS tools when I bought my first Myford and one was this tool, but he couldn't tell me what it was for. The only time I used it, it was as a parting off tool.
Thanks for this useful video. I’ve been pondering how to cut rings from 2 inch dia phosphor bronze for several days now. In general I hate the waste of time and material from boring large holes in anything, so I’ll be using this technique as often as I can.
SWEET IDEA. Thank you Tom, I definitely will put this too to use. Thank you for posting this as well as the hundreds of other videos that you have produced for us through the years. Your expert machinist skills coupled with thinking outside the box is a great boost to all who view your channel.
Tom, EXCELLENT VIDEO! I've previously searched for a video on this tool (& came up empty), particularly for a quicker way to cut a round out of square plate stock, without having to spend soooo much time cutting the square corners off a chip at a time (think pulleys). Pay no attention to all of the safety complainers, or the confused comments about terminology or grinding/red hardness... Definitely the best trepanning bit video on the Tube! Thanks for taking us along.
Catching up on things I had missed. Very nice job explaining how and why you grind a high speed tool for a special job. Makes me want to go out to the shop and play with the lathe for a while. Take Care and Stay Safe. Bob
Neat! It's always a pleasure to spend some time listening to a guy who really understands what he's doing. I hope someday to work in a place where there are people like Tom Lipton around.
Fantastic... I once did it using a hss power saw blade that was broken on some brass material for training of some trainees.. Glad to get some new idea from you. Thanks for sharing 🙏🏻
Excellent video! Thanks. I made similar tools for cutting large holes in the face of a half inch plate but after watching this video I suspect my next tool will function better.
Lot of people think HSS is no longer a viable option ...how wrong are they . I've made so many different styles of tools using HSS . Great video Tom (I'm a wee tad late to the party )
Very Nice, I like how you explained the need for clearing the outside surface of the of the tool. it is a real neat solution. Not to change the subject, but changing the subject. I want to tell you that I really enjoyed the video on the differential screw. I hope that you have more videos where you make tools that use that principle. I liked how the screw controls very fine movements over short distances. The only complaint I have about your videos is that there are not enough of them. Keep up the good work. P. S. I met you at the bash (6/24) and I hope to come and visit you at your shop some day. I'll definitely call first and make sure that you have some free time. I promise to not spend all day checking out the shop (:-).
Nice tool grinding, Just in time for me I'm making some bearing race compressors out of 0-1 tool steel and wanted to save the center of the stock for another project, this will be perfect. Thanks for the detail, Eric
I enjoyed that Tom - good to see HSS being used - we home shop chaps seldom have the larger lathes capable of getting the best from insert tools. Tried trepanning on some aluminium round stock a while back - it got interesting when I got more than 0.500" deep ... sticky stuff and the fine honed edge still got gummed up - thankfully I didn't need too many rings.
We once used a "face groove" carbide insert tool for a project at work. Basically the exact same thing you just made except I think the manufacturer was a little embarrassed of the depth capable. I think we needed 8 pieces and would use an insert and a half on one part, not particularly difficult material either. I think we ended up relocating the op on the next batch and milling the faces for the o-ring seats in one of our live tooling lathes. great video as always.
I made a small groove bit for the seal on a air gun barrel talk about small and fragile LOL I enjoyed your video Thank you for taking the time I never thought about making a ring but now I know if I need one
Great tip Tom, many applications, O-ring grooves springs to mind, I've also used trepanning to cut large holes in 3mm plate clamped on a face plate in the lathe works like single point annular cutter. Regards Ralph
needed to learn how to make that tool for future jobs. PS thanks for the couple of items I purchased from you at the Bar Z swapmeet. Used the mike a few times already. Still need to install the high pressure gage.
Nice job Tom. It was lovely to see the chip curling away so smoothly from a shop made tool. It reminded me of when I was making hand planes some years ago and the pleasure I got when the plane produced a long, thin, curling shavings. B
Hey, Tom, great video. I've done this in a mill but never thought of it as a way to economize on expensive round (or hex!) stock. Very practical. Thanks again.
That's a neat trick Tom! I'll have to lock that a way in the old noggin. I work with a guy that saves used carbide grooving inserts and regrinds them for special jobs. It's always cool to learn something new like that.
Thanks for the vid and the info. Wish I had thought of the cut off wheel or seen this video a couple of weeks ago, I ordered a piece of 16mm square Fagersta 10% Co and made a double ended chamfer tool and that stuff is HARD to grind away. Took me a long time to grind away the 45 degree bevels. I guess it was my own fault since I used a cutoff wheel in a dremel to cut it to length and never gave thought to cutting the bevels away.
Great video. I can see this being useful. I am not sure why I have never considered using a but off wheel on tool bits before. It certainly is a lot faster than grinding to get the rough scape.
Hi Tom . Thanks for your informative channel . I sometimes use a small ball shaped diamond burr , to make an indent , where you put your positive relief , at the front end of the tool . this causes the shavings to go concave and pull away from the job .
Amazing that there is so much to learn. This was informative and knowing that I can cut tool steel with an angle grinder is a big help. I love the Flexovit 0,8mm thick cutoff blades which makes cutting steel something like cutting butter compared to even a 1.0mm thick blade. Nice video for sure. Thanks for sharing!
Thank You Tom! I cannot express how much I learned from this video. Of course I'm just wanna-be home machinist. My next door neighbor is real machinist and gets tired of my constant requests for information. 73, Bob
great that you posted this! I need to do something just like this and was puzzling over the tool geometry. TYSM! now I know what this is called haha. annular cutting, face grooving and trepanning
Very good video. I’m still at it after over 50 years. One thing I make my apprentices do is grind their own tools(sometimes). They seem to hate for doing so but they thank me later. It helps in learning visualization skills. Thanks.
Tom, Great demo of making and using a trepanning tool. At the end I noticed a card for the etching press. Any news on the progress of that project. I'm amazed at the level of detailed hand work you are putting into that project.
Great demo. I used the disc grinder minus the guards but always wear a full fact shield. Usually the bigger ones (4+ inches in diameter) don't explode like the dremel tool sizes, those are terrible!
Next time you want to fine tune a chip breaker, use a 1/4" shank mounted chain saw sharpening point. You get 3 or 5 in a blister pack. You get better finishes and the grinding striations align with the chip flow. And you can doctor up a dull tool up on the lathe.
Hi Forrest, I have little experience with chain saws and never knew such a tool existed. It always amazes me the tools I didn't know I needed. All the best, Tom
Look here for chainsaw sharpening stones. www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=chainsaw+sharpening+stones&_sacat=0 Lotsa choices, lotsa radii. Not expensivve
Good stuff, Tom. This was well timed for me. I bought an old, abused monstrosity of a machine vise to use on the shaper. It came mounted to a chunk of very hard 5/8 plate that is oversized for the shaper table. My thought was to use part of it to fabricate a swivel type base. It would be a huge waste to turn what I don't need into chips (not to mention taking forever) and I think trepanning would be a great way extract what I want to keep. However, this is tough stuff, and I'm not certain that HSS would last long (if at all) before burning the edge off. So, if you are aware of carbide options for such an operation, I would appreciate hearing about them. The only other option I can see at this point would be to flame cut it, and that would bring in a whole different can of worms with it.
Great video Tom. I can always count on learning something in every one of them. I've been waiting to see you do more with your lapping series. Please don't let the Bozo's and their comments/arguments dissuade you from doing more on the lapping plates you made. I want to see them being put to use and what they will do. Please???
Always an interesting time watching you Tom. enjoyed the tour of the high energy physics lab you did great to know our high tech is being serviced by American professional machinists
Cool video, thank you. I wonder, is there any specific reason the tool is not straight, but has an angle? It seeeit woukd be easier to relieve just a side of the blank and end up with a straight tool. Then one would feed it in like a boring bar. Perpendicular to the work's face. Also, I wish cutting a dovetail trepan (in steel or stainless) is shown in a video in future.
Hi Tom, My Friday's video #133 on making a DIY Tapmatic shows an adjustable angle V block I bought. I can't find any videos on how to clamp something in it. None! Would be great if you could shed some light on this void... Dave
Great video once again. Although couple of things caught my eye in the video. First is that there's no disc guard in your angle grinder. I guess you've never had a disc get thrown apart or maybe you're experienced enough to take other precautions. In my opinion, you should still warn others for the very likely hazard as you're an example to a lot of people! Other thing is that does the heat build up to the HSS blank damage it's tempering while cutting it with the angle grinder?
