Once the magic smoke comes out, things don't work any more.
John Kasunich
jmkasunich@fastmail.fm
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Sat, 24 Nov 2007
Stepper motor pulleys bored out
It has been nearly a year since I posted about progress on my Shoptask CNC conversion. Unfortunately, that is because it's been nearly a year since there was any progress. Today I finally did something in that direction.
The Shoptask is (sort of) set up for CNC when you get it. There are motor mounts, and it comes with tooth belt pulleys for the motors. However, the pulleys are bored for 3/8" motor shafts (traditional NEMA-34 steppers). But my motors are modern high-torque square frame ones, and they have 1/2" shafts. So tonight I bored out the pulleys to 0.495, then reamed them to final size. The hardest part of the job was figuring out how to hold them accurately. The flanges are thin and not concentric. The hubs are too small to grab. I wound up boring a short piece of 1-1/2" aluminum bar to fit between the flanges and over the main portion of the pulley. Then I split it into two half-circles with the bandsaw. The 1-1/2" OD is just enough to clear the flanges, and chucking on that OD gets the hub nicely concentric.
(posted: 24 Nov 2007 21:50) (permalink)