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  #71  
Old 12-11-2021, 06:05 PM
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Being in the Christmas spirit, I hunted up a piece of AL eXtrusion out of inventory.
4 7/8 x 5 x 5/8" thick. Should do for a practice piece.

If you PM me an address, I'll get it posted off to you.

Merry Christmas IM.
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Design to 0.001", measure to 1/32", cut with an axe, grind to fit..
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  #72  
Old 12-18-2021, 06:03 PM
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This seems to be a thorough runthrough of setting up and cutting a gear.

https://youtu.be/vehd9VWNfhs

Disclaimer though. English is not his first language. He does do fairly well though, IMHO.
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  #73  
Old 12-18-2021, 06:52 PM
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Quote:
Originally Posted by camdigger View Post
This seems to be a thorough runthrough of setting up and cutting a gear.

https://youtu.be/vehd9VWNfhs

Disclaimer though. English is not his first language. He does do fairly well though, IMHO.
That's timely as the $90 dollar involute cutter set arrived from China a couple days ago.
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  #74  
Old 12-18-2021, 09:15 PM
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Geez....haven't you got that thing done yet?
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Measure twice and cut once...or...wait, was that the other way around?
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  #75  
Old 12-22-2021, 11:35 AM
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Nope.
I have to make a metric mandrel to hold the work, and a metric mandrel to hold the cutter. That's 1/2 done, cutting keyways today
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  #76  
Old 12-22-2021, 12:09 PM
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Quote:
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I'm getting closer to the day I have to cut a 51 tooth gear for my drill press.

This gearbox is not filled with oil, it runs dry like a angle grinder gearbox.
The existing gear is a 3/4" micarta gear meshing with a steel gear. I obviously am not going to use micarta. I would like to use a self lubricating material. I have been thinking about bronze for that, or go with aluminum, nylon, or cast iron.
The meshing gear is steel that can be easily cut with a file, so it is mild. If it was hardened, I could cut a mild steel gear.

So, what does the brain trust suggest?
graphite impregnated bronze would be a good choice.. Oil lite...
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  #77  
Old 12-25-2021, 11:02 PM
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I have always been fascinated by the hobbing process of gear generation. This link is to shopmade hobs and their application. https://youtu.be/F7vQ9oVkX-k
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  #78  
Old 12-26-2021, 08:46 AM
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I got your aluminum test blanks in the mail on Christmas eve, Cam. Thanks
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  #79  
Old 12-26-2021, 02:34 PM
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Quote:
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I got your aluminum test blanks in the mail on Christmas eve, Cam. Thanks
Good to hear they made it.

I am looking forward to hearing how the gear cutting goes.

Random thought.... I found some UHMW cutting boards at Princess designed for the home butcher. As such, they are 50% thicker than typical cutting boards (about 1/2") and a bit larger overall (12x24"). At +/- 20$ - 25$, they would make cheap stock for projects.
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