Have never not given a thumbs up, and certainly not on this one. It is amazing what one can do with a bit of creativity, math, reference books, your teaching and experience and TH-cam. Love it! Thanks for this one. PS I'm in a hotel in Qaqortoq in South Greenland as part of a tour as pianist with a Greenlandic opera singer, two extremely good musicians playing cello and flute respectively, and lucky me on piano. Watching your video here made me feel strangely back at home where I could fall asleep while watching after a hard day's work. No work here though! Just pleasure.
I made a 2" hitch ball using coordinates. Didn't come out quite as perfect as yours, but was more than good enough to pull a lawn trailer around. I had lots of points and it was pretty time consuming.
Salut Gaëtan! Je ne sais pas si tu le sais mais mes vidéos sont également disponibles en français. Voir mon site web pour les trouver facilement! THATLAZYMACHINIST.COM
Yes! Take a diameter cut on a part of scrap and measure it. Then turn the cross slide handwheel by ten thousands and recut. If the parts diameter reduces by ten thousands you have a diameter cutting machine. If it reduces by twice that amount it is radius cutting. If it reduces by a BIZARRE AMOUNT, you probably have a metric lathe (just kidding!!!)Thanks for watching and be safe, Marc
Sorry Howie! The previous answer was meant for Frederick Lynch! This must my new version of going down to the basement and not remembering why! Just another senior moment!
Hi Ray! You are correct. I said divide but I should have said multiply. Thanks for catching the problem, as my father use to say "Marc your mouth is going faster than your brain!" I have added a not around the 15:03 mark and thank you for your vigilance. the notes may not appear on mobile devices and it could take up to a day before the changes occur in TH-cam. Marc
.750 + .375=1.125. I’m pretty sure he meant to say half of the diameter of cutter which is also the radius. The radius of cutter is .1875 so The bolt circle is .750+.1875=.9375B.Circle
Thanks for a great video, new to your channel and have really enjoyed what you're doing. Question please, figuring the dia. I can't get .9375 by adding the dia. Of the stock (.7500) and dia of tool (.3750), should I be taking the radius of the tool. Again, I'm really enjoying your work, have looked forever for a site dedicated to the novice. At 70 I'm not new to much, learning about the incredible art of machining has been one of the most fun things I've ever done. Thanks again.
Hi Bob! Great question! The bolt hole circle calculator in the handbook and on the internet both use the bolt hole circle diameter. Since I am using a 3/8" diameter tool I have to add that to the diameter of the bolt hole circle. WHY? Because you have to include two times the radius of the tool (which is equal to its diameter) since this is on a lathe and a lathe cuts on both sides simultaneously. I hope this helps, I will include a sketch in the beginning of the next little quickie video. Thanks for watching and for taking the time to write, Marc.
Marc... you are a damn fine machinist and teacher - and you crack me up with your little jokes! Hope you are doing well - You are in my prayers.
If you know your way around the unit circle and basic trig, you could figure it the coordinates out by hand.
I agree and I do know how but I am thatLAZYmachinist.
good work. thanks
note you stated .194 for the x coordinates for point 2. instead of .324 at time 9.02. I think this may be incorrect.
cheers
Have never not given a thumbs up, and certainly not on this one. It is amazing what one can do with a bit of creativity, math, reference books, your teaching and experience and TH-cam. Love it! Thanks for this one. PS I'm in a hotel in Qaqortoq in South Greenland as part of a tour as pianist with a Greenlandic opera singer, two extremely good musicians playing cello and flute respectively, and lucky me on piano. Watching your video here made me feel strangely back at home where I could fall asleep while watching after a hard day's work. No work here though! Just pleasure.
Thanks Jim! you always have something nice to say and a great story to tell. It is appreciated, Marc
By a simple extrapolation this method could be used to create any profile. Classic 3 ball handles or crowning a flat belt pulley for example.
I made a 2" hitch ball using coordinates. Didn't come out quite as perfect as yours, but was more than good enough to pull a lawn trailer around. I had lots of points and it was pretty time consuming.
Well that aint half bad. Great video, thanks.
Great as always. old school is the way for me
Good info. Great method. Excellent teaching! Thanks!
Cool, thanks for the tip Marc.
Another great video!! Could you make a video of grinding and sharping the radius tool?
Thanks for that Mark. It brings me right back to the stuff we learnt as apprentices. Keep it up.
That was TOO COOL!!
Nice job of kellering on the lathe.
Hi Randy! I know what you mean but you should check out the definition of kellering in the urban dictionary!
thank for a great video good to see you looking well.
Dear Marc, thank you very much
Lesson: 67
I'd just like to thank you for your videos that are a great tutorial resource!
Good work
I like this method - thanks!
Clever!
Great work
Great video.
Great information.
If you are a lazy machinist ?, That's makes bone Idle !
Liked and subscribed
From the UK.
just great , I love this kind of stuff
thanks, all your video are well explain
Salut Gaëtan! Je ne sais pas si tu le sais mais mes vidéos sont également disponibles en français. Voir mon site web pour les trouver facilement! THATLAZYMACHINIST.COM
Other than actually measuring the distance the cross slide moves, is there a way to tell if a lathe is cutting on the radius or diameter?
Thank you for sharing this with us. Can this principal be applied to tapers and portions of a radius to produce a curve?
Seems the circle plotting formula(x² + y² = r²) would work nicely here. No?
If you like the video, my name is Marc, if you don't like it, my name is Howie! Thanks Marc, good video, I enjoyed it, Salut!
Yes! Take a diameter cut on a part of scrap and measure it. Then turn the cross slide handwheel by ten thousands and recut. If the parts diameter reduces by ten thousands you have a diameter cutting machine. If it reduces by twice that amount it is radius cutting. If it reduces by a BIZARRE AMOUNT, you probably have a metric lathe (just kidding!!!)Thanks for watching and be safe, Marc
Sorry Howie! The previous answer was meant for Frederick Lynch! This must my new version of going down to the basement and not remembering why! Just another senior moment!
Hey i understand, I am sitting here awaiting OAP check #1 myself
OK how about turning a complete ball on the lathe?
Why not! Great suggestion, it will be the subject of my next little quickie. Thanks for watching and be safe, Marc
Hi Marc, wouldn't you double the calculated values for a diameter reading lathe because the tool only moves half the distance?
Hi Ray! You are correct. I said divide but I should have said multiply. Thanks for catching the problem, as my father use to say "Marc your mouth is going faster than your brain!" I have added a not around the 15:03 mark and thank you for your vigilance. the notes may not appear on mobile devices and it could take up to a day before the changes occur in TH-cam. Marc
.750 + .375=1.125. I’m pretty sure he meant to say half of the diameter of cutter which is also the radius. The radius of cutter is .1875 so The bolt circle is .750+.1875=.9375B.Circle
Thanks for a great video, new to your channel and have really enjoyed what you're doing. Question please, figuring the dia. I can't get .9375 by adding the dia. Of the stock (.7500) and dia of tool (.3750), should I be taking the radius of the tool. Again, I'm really enjoying your work, have looked forever for a site dedicated to the novice. At 70 I'm not new to much, learning about the incredible art of machining has been one of the most fun things I've ever done. Thanks again.
Hi Bob! Great question! The bolt hole circle calculator in the handbook and on the internet both use the bolt hole circle diameter. Since I am using a 3/8" diameter tool I have to add that to the diameter of the bolt hole circle. WHY? Because you have to include two times the radius of the tool (which is equal to its diameter) since this is on a lathe and a lathe cuts on both sides simultaneously. I hope this helps, I will include a sketch in the beginning of the next little quickie video. Thanks for watching and for taking the time to write, Marc.
This confused me too. It appears to be the diameter of the ball (0.75) plus the radius of the cutter (0.1875).
ahem. taofledermaus. you make it they shoot it (out of shotguns), just sayin'