Quote:
Originally Posted by cad321
I heard when we were at Waterloo last year that 1114 also ran into this issue last year when making a their custom PTO (correct me if I'm wrong). Finally for the machining aspect, we CNC'd the plates last year in our shop and they turned out fantastic! I wouldn't even want to imagine having to do it on a manual mill though. I would definitely suggest having access to a CNC, water jet or laser cutter for this.
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IIRC, 1114 didn't have a PTO in 2013.
As for the transmissions, they aren't actually that difficult to do on a manual mill if you don't include fancy lightening holes, or you use a thin plate and add bends for rigidity.
To make them on a manual mill, you need holes for the motor/motor mounts (2 holes, 4 mounting holes), then holes for your bearings, then mounting holes for the gearbox. If you want press fit bearings, drill the holes undersize and ream them.
I can get a much more accurate part on a 60's bridgeport that on a 20k CNC machine I've used on a robotics team. On my bridgeport, I can always approach my hole from the same way, meaning backlash in the ball screws doesn't affect my accuracy.