Great series Mr. Pete. You are the "owner's manual" for my DUMORE #44. I believe it's a 1940's vintage like my 9" SBL-A which was "born" December, 1941 -- what a month! God bless.
As always, an enlightening video if there ever was one. There is NO body like our "Mr Pete". This is where one should go to learn "how" it is done in the fascinating world of machinists and machining. Thanks a million Lyle.
If you took another pass or two at .0005” doc, or as little as you can see on the dials, it should help with the surface finish. Much the same as on a surface grinder. I don’t need to regrind any dead centres, but I’d love to make a few different sized live centres, as they can be quite expensive. Even for Chinese. Making a tool post grinder has long been on my to-do list. You’ve bumped the tool post grinder project up a few spots on that list. Thanks for the video, Mr Pete.
Off subject for this video ( somewhat ) but it has to be said . I was just in the process of laying out some features on a piece of sheet metal. I had drawn pencil lines and picked up a punch. Just then , i remembered a tip from our shop teacher mrpete222. I scribed over the pencil lines that I had drawn earlier . I was then able to lightly drag a prick punch in to the scribed lines and make the job much more accurate. Thank You mrpete for your guidance and wisdom .
Ohh... good video, I would not spend 12 bucks and throw out a piece that is useful yet, and I can still use it, with you I always learn something more.
Another great tutorial on grinding tips (I wonder how many people have put grinding tips in the search bar hoping to find something more dubious?) me, no not me Pete, engineering does enough for me and that all I have to say about that. Love the tutorial Pete as per usual top notch teaching us on here what modern school are no longer able to teach, I think that it’s like that all around the globe. I for one are grateful for the interesting topics that you post, I’m sure that there are many more people who are grateful for the information, keep showing us Pete and we will keep watching the videos..all the very best wishes from the UK......Phil
34 years doing production machine shop maintenance and I only did one tool post grinding repair on a manual lathe. We did dress spindle tapers on CNC mills (CAT 40 and CAT 50). We set up with a grinder perpendicular to the Z axis travel and programmed a Z axis taper move. The grinder arbor was naturally long enough to reach full depth of the spindle taper, and we ground only with the corner of the wheel, so no dressing was required. We didn't own our own setup for spindle tapers, so we contracted this service with a local vendor. Slight, but significant, damage could be dressed out when spindle bearings had not yet been compromised. Dressing naturally moves Z axis tool position requiring resetting Z axis home position. Dressing not only saved compromised spindle tapers, but avoided costly spindle replacement/rebuilding and the machine teardown time. A typical dressing could be done with less than 4 hours production interruption. Really aggressive dressing could affect tool retention force, so this required testing with a drawbar force gauge and potential drawbar spring force correction.
Consider using tin foil over the ways instead of your wife's drapes as cloth can get picked up in the spindles and create quite a hazard. It will be safer and your wife will be happier. :) Another great video, thanks for taking the time to make and post it.
I use worn out 6mm carbide endmills as centers in my 6mm watchmaker lathe. wish I could make female centers from them aswell,. Sadly grinding internal cone in carbide to tolerances needed and with 0.1mm hole in exact center is beyond me (the hole is to protect the tips that bear in the jewels). So I have to live with steel for now.
A series on what else can be done with a toolpost grinder would be cool. Especially the part on just how accurate you can get. Do they have any application on a milling machine?
I always wonder what a tool post grinder was used for and how to use it. Thank you Mr Pete for the video, keep them coming. Just a swarf maker here. P.S Try to make a mold for model steam engine's fly wheels like you did. Did not turn out so great. The half's did line up. Will keep on trying. If you can and if others are interested on how you did it maybe you can do a video on it. I know it is time consuming to make a video and you need to keep the majority of your views interest in a vast learning field of machining methods. Keep up the excellent work and ignore the naysayers.
I always look forward to your videos sir, your voice reminds me of my machine shop teacher, Mr. Brown. I was just wondering, does your breath smell like peppermint schnapps too? Good ole Mr. Brown had a thermos in the big drawer of his desk, and i always wondered why he would run down the hall to the teachers lounge and get coffee in his mug just to sit at his desk and pour more coffee in from his thermos. Found out one day when he was takin a kid to the nurses office. WOO! 100 proof peppermint rocket fuel. Lol. That man was one of my favorite teachers, and 35 years later i still think of him fondly with a smile on my face.
Mr Pete, Very good video! I love Cutter-Grind, it's truly an art that's falling by the wayside. And $10 or 12, waste not want not, I'd rather grind them.
Mr .pete the wheel broke all the way down on the first pass that was why your finish was not good you could see it in the video. Would live to have a tool post grinder just not in budget now.. Nice setup and a nice toll post grinder. 👍👍👍👍👍 Watching in Alabama
Nice work and video. A word of caution though. Sucking sparks with a vacuum cleaner could be a risky idea. If the dust bag contains combustible material it is possible that it may catch fire when you turn your back to it. To be safe you can take it out and put it in a steel bucket over night.
Mr, Pete - This may seem like a silly question, but other than a finer grit on the wheel, is there another way to improve the finish? (scotch brite, crocus cloth, etc.) Or would that destroy the angle accuracy? Great video, truly enjoy all the information you are passing on to the world. Also, how would this process work for live centers?
real grinding is complex, a lot of factors all combining. remember when you look at a nice bit of shafting, justhow good the grind finish was. very rarely do they go to the next step of lapping or burnishing anymore. theres not just grit count. theres bond strength, grain structure... you can have two 40 grits, one close packed with large grit size, whilst you can have a loosely packed and open wheel with fine grit. the spacing and "coarseness" is still the same. one will grind faster, but produce more heat in the work. the other will get the good finish but will tend to glaze burn load up clog... but then with some fiddling on speeds and feeds and you can almost reverse those properties. as wheels spin slower they get "softer", faster they get "harder". different metals want different combinations... sadly these days the selection of wheels is really limited. searching online and yeah... unless you wanna cough up. do you intend on grinding all day? may as well get a dedicated grinder whilst youre at it. i grab any old stone i can find that rings "solid". quite happy to core them out and redress them to the size i need... 5" usually. once the labels have gone, no idea what im using, but you soon get a feel for what stone suits what work? just because it looks good doesnt mean it is good! arrrgh!
Outstanding video MrPete, but I have a question for the crowd:Is turning between centers inherently more precise or is holding in a four jaw chuck on one end more precise? Which do you think best?
I have some tool post grinders that are on the bucket list of shop projects. How did you figure out the thickness of your adapter shim? (that's the next step for my project). I like how you set square, but i wonder how much would be involved to set the angle with a sine bar. Also, a video on regrinding a spindle taper would be cool to see.
What is your reasoning for running the lathe in reverse? I own an automotive machine shop and grind crankshafts . On my crankshaft grinder the crankshaft and grinder stone feed into each other with their rotations, not oppose each other like you just did??? I love all your videos!!! Keep them coming! I just watched again, I stands corrected , same thing only opposite/backwards!
Like the vac idea, will have to add that to my next grind. Would any type of cutting oil help the finish? Just comparing to the fluid drip on some valve grinders during the grinding operation.
Hello Well another great video to add to your arsenal! Being a owner of a South Bend Heavy L I caught you using a spindle adapter for the morse tapered centers, WOW I sure could use a #2 and #3 sized adapter. Do you know if they are available anywhere? Thanks for your input and knowledge! Ray P
Mr. Pete, can you talk about the coarse grind? Does it work like scraping, in the sense that the peaks are the contact surfaces, and the valleys are just along for the ride?
Just another way I put a dead centre in the head stock and a live centre in the tail stock my grinder has a centre hole on both sides that way I get both up and down and centre.
My chuck has some threaded holes in the side to attach a lifting ring. I simply bolted a diamond to that and dressed the wheel. I’m not quite sure how to get a picture of the setup to you.
the finish is dependent less on the grit and more on other factors... that I may not understand as well as solid rock machine shop inc. they have a lot of useful information on surface grinding to precision... as they are tool makers. there is a youtube channel where they post grinding tips among other things. c: I'm not sure if it is especially useful to get into depth on grinding skills and methods for your application, however, any information is useful information... And more so if it is from those with very pertinent experience.
I've got that same grinder... or at least the Sears equivalent of it. It always made me a bit nervous to have that much mass on top of such a tiny toolpost. I've only ever used it twice. The man who owned the lathe before me had purchased just about every option possible... then I came across another lathe with damaged gears... it had the rest of the options. At some point, I'll convert the second lathe into a CNC machine... I have the steppers and hardware... I just need the space to set it up. Something about working on a lathe... dunno... very relaxing.
BARNEZY44 _ - nope, it really. I’ve seen a few for sale privately around me (Ontario, Canada) for around $750. A luxury item. But.... when you need a ground finish, you need a ground finish. If you have a surface grinder, it’s easier and cheaper to make a grinding fixture.
I'm looking for a tool post grinder for my Southbend 9" lathe. Any tips on where to find one? I recently bought this lathe and got EVERYTHING original with it (built in 1945). No OD grinder though :(
Hisham Mosa I found the video it is MACHINE SHOP TIPS #147 GRINDING THE JAWS ON A 3 --- JAW CHUCK TUBALCAIN. Hisham Mosa if your English is not very good and you are trying to learn I would be glad to help you out. Let me know and if it is a language problem I will give you my Email. Send reply. If you just want me do look for things because you're lazy forget it. I would be glad to help anyone that is trying to improve there self.
@@hishammosa6977 that's what I thought. Hisham Mosa my Email is Andyzulim@gmail.com. just call me Andy if you need anything don't hesitate to email me. It would be good for me to for I've had health issues for 28 years and am just starting to get back in the shop. I have alot of knowledge going to waste. If you are new to machining I am sure that I can help you improve your chuck.
Would you consider making a 5c to MT adapter? I need to do this for my Harrison Lathe as it is missing the factory adapter. Mine would be Jarno 13 to MT3
Excellent Mr Pete. What is the approximate rpm of the grinding wheel. I am considering making my own tool post grinder using a Makita Router as the power source and a home made spindle belt drive like the Dumore has.
Grinding on a lathe 😱... Are towels enough? I've herd bad things about it.... Stuff like metal powder getting into bearings and carriage gaps. But I've also seen rotary tool attachments for lathe
Well then what exactly would you suggest? He had the vacuum cleaner running that I would guess picked up over 80% of the dust. Don’t over think things.
@@SurajGrewal dust can ruin ways slowly,and after using lathe 50 or 60 years ,there will be much sloppiness in lathe....its all depend how long you will have that lathe ,how good you cleaned it ,and how long you think you will lived
