The Home Machinist!

My first though this morning was that was good thinking for 8-1 but not for 30-1 Then I read your post. I was using grade school math I had forgot that Pi thing. I will go back to the drawing board. Maybe increase the size of the big pulley say to 5.5 inches make it a wheel use the o ring as tread r...

I did not do the math when I made the drawing.I was thinking the 3/8-10 acme would be moving in and out any way so put a pulley on lt and haft the problem is solved. Make that a 4 inch pulley and a 1/2 inch drive pulley with the o ring drive belt. The finished part is a little over 1/2 inch long mak...

This came to mind. Both pulley and drive wheel would move in and out together. just have to figure out pulley size to get 30 to 1 ratio

PIC_1646.JPG Harold Sorry you are right it that old saying being to close to the forest ? The part has 5 groves .090 wide and .065 deep land between each grove as close as I can measure is.033 the diameter is 3/8 length is about .648. I'm inclosing a photo of a finished part That I hope will help c...

As I said in the beginning I have a small that is SMALL 3 in 1 Its just a little bigger than the old NUMAT. I can't find a name on it so I guess finding part will be a nightmare. Any way I just checked on RPM and 2500 is tops on the lath and the mill does that mean I need to start looking to farm ou...

Thanks for your 2 cents. I will work on doing away with the hand crank maybe replace it with a worm drive of some kind. I'm not suer I understand your suggestion about the two nuts and spring. Do you mean to use nuts instead of threading the fixture itself ? would you elaborate on that a little. Due...

Fixture.jpg I came up with this fixture off the top of my head. Do you think this might work?. Jump in any one add your 2 cents. My program would on let me add any text on the drawing so I'm adding them here the fixture is made from 6X4X1 with 3/8-10 ACME threaded rod with hand crank. the 3/8 Brass...

What are you making it out of? How big is it? No doubt it would be simple to replicate with a 4 or 5 axis CNC machine and in the past there were all sorts of mechanical gear making machines that could advance and rotate the workpiece simultaneously. But given the limitations of a 3-in-1 machine, my...

For some reason, I can barely make out your drawing -- it's very faint and very small. It looks like it might be a worm, rather than a gear? I think you can cut those in the same manner as cutting a thread. You would have to grind a form tool the right shape, and you would have to figure out the pi...

Can any one describe how to cut this gear. I have a small hobby 3 in 1. and willing to learn Thanks Jim