My point, exactly, was that most of us are not professional machinists. Saying that you need to grind multiple tools to cut the profiles necessary would be useful information, though not sufficient. OP asked for pics of the necessary tool. So it is pretty obvious to me that he is, in fact, clueless, and trying to educate himself. What he got was snark, and not at all helpful.?
This hobby needs more people to keep it alive. It isn't intended strictly for crusty old professionals. I'm not a professional, either, but I'm taking a class to become one. And you know what? They haven't taught me how to cut a pulley in my class, and won't. It's not in the curriculum. They don't teach making gears, either. Professionals buy those things now. They don't make their own. Pretty much anyone MAKING a pulley or gear is an amateur, now. The info is available if you know where to look, but it's buried in old books and magazines and the fossilized brains of old machinists. It's hard to dig out because most of those guys have forgotten how they learned. Someone showed them, back in the mists of time.
Besides, GP is notorious for that.?
/Rant
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
On Friday, April 17, 2020, 08:35:42 AM CDT, jmartin957 <jmartin957@...> via groups.io <jmartin957@...> wrote:
Guenther¡¯s reply may have seemed harsh, but I don¡¯t think he was far off target.
I¡¯d have instead said that any decent machinist - or anyone with experience running one of these light lathes - will already know how to grind the tools to cut the pulley grooves. Because the key word here is tools - not tool.
Trying to turn grooves for normal sized V belts on lathes like these doesn¡¯t work very well with form tools. ?Instead, you need several different tools - the ones you use every day. ?A parting tool to cut the depth of the groove, and to cut the bottom to width. ?A facing tool to cut the left side of the groove, with the compound feeding at the proper angle. ?And then the mirror image of that facing tool to cut the right side of the groove, with the compound set the other way. ?No pics should be needed.
Not only would a form tool make no sense because of the likelihood of chatter, but you¡¯d need different form tools for each pulley diameter. ?The angles are different for each diameter.
On Apr 17, 2020, at 12:44 AM, Bill in OKC too via groups.io <wmrmeyers@...> wrote:
? Guenther, most of us here are amateurs. Not professional machinists. That is quite enough. If you do not have something constructive to say, do not say anything at all.
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
On Thursday, April 16, 2020, 11:26:20 PM CDT, Guenther Paul <paulguenter@...> wrote:
Any decent machinist should know how to grind cutting tool for his machining job
GP
On Thursday, April 16, 2020, 7:33:53 PM EDT, mike allen <animal@...> wrote:
??? ??? any one have any pic's of the tool profile they use for makin pulleys ? ??? ??? animal
On 4/16/2020 2:46 PM, Dave Matticks wrote:
John, Nice article! Procedure look good, I'd use different tooling but same idea. Not going to make one for this episode but I have made a pulley or 2 in the past. Trued up a couple die cast ones as well, some are near useless out of the box. Not only made in USA but 2 miles from my house!
Dave
On April 16, 2020 at 1:02 PM "John Wilshusen via groups.io" <wilshusen@...> wrote:
Bruce, One additional thing to add to your literature pile. ?I read and applied what i learned in this write-up when I was making the motor pulley for my lathe. ?You might find it useful as well.
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Good luck! John ?
So you're planning to create a pulley, eh? I'd really like to see a video of that!? Most of us have to settle for fabricating things. On Wed, Apr 15, 2020, 7:00 PM Dave Matticks < dpm100@...> wrote: Bruce, Yeah, 7075 is expensive but 6061 would work better than fine. 7075 just cuts so nice. Going cast iron is not going to save any money regardless of how you do it unless you pour it yourself! They don't carry round 7075 but you might get a good price on 6061 from Clinton Aluminum. McMaster Carr can surprise you sometimes. Alro sucks price wise! Have fun,
Dave On April 15, 2020 at 7:46 AM exerpd+groupsio@... wrote:
Thanks all! ? Glenn N ¨C Yes, Robert Downs put this file in the files section. ? Brad ¨C How can 3-D printing & casting & machining be less expensive than the piece of aluminum? ? Kay ¨C Thanks for the Speedy Metals link. ? Robert Downs / Guenther Paul ¨C Thanks for the suggestions on how to machine it more easily. ? Kay Davis / Dave Matticks ¨C 7075 seems much more expensive than the other aluminum choices. ? Craig Treleaven ¨C Thanks for filling me in on the edits I make causing problems.? I get the update only daily, so do not have this problem.? The only times I do this instead of a separate post, is when I have grammar or formatting errors.? It seems like every group has different formatting defaults.? And in this group you cannot see what the final formatting is going to look like until AFTER you post.? Will try to be more careful. ? So everyone understands, it may be a while before I create this aluminum pulley.? I will update everyone when I complete this or have questions.? Prior to November, I did not even own a lathe, so I am new to this & still learning.? What might be easy to some, is new to me.? I am going to a) wait a little while to see if I can locate an OEM 60-29 pulley.? b) If not, then I will do the aluminum pulley machining.? As was discussed early in this thread, I do not use the drill press constantly & it is working as is.? So this is not an immediate necessity. --
Bruce Varner
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Bill in OKC too