Posted by Robi on March 05, 2010 at 02:34:38:
I have always been fascinated with gears, so I finally got a gear hobber for my home shop. I have a 132 that I have been playing with, but there is very little info available.
So I thought I would post some stuff I have figured out and maybe trade info with other Mikron owners.
My change gears are 14mm bore, 12mm wide, 1.25mm module (determined by meshing two gears and measuring center distance)
The change gear setup I have is 68 driving 84 then 42 driving 72, with this setup when I turn the hob arbor 34 times the workpiece turns just over 1 time. Sounds a bit odd, shouldn't it exactly 34?
The main spindle and tailstock are a nonstandard size. I made an arbor out of aluminum to see If I could determine the taper. After several attempts I finally got a good fit at 4.5 degrees, large end .600, length 1.375. I will tap the end 5/16-24.
I also made a drawbar, .355 diameter, 9.00 long, with a 5/16-24 x .75long thread.
The hob arbor is 10mm diameter, I found an illustration which leads me to believe the hob arbor can be changed out for different holders.
I am also designing a live tailstock arbor.
I would like to know what would a full set of change gears would consist of. Also does anyone know what the machine constant is?
Thanks,
Robi