- Joined
- Jan 3, 2015
- Messages
- 400
Sure. 200 steps per revolution with 8x microsteps. No pulley or other reduction, just 1:1.
A special thanks to jbolt for enlightening me on this test. You can isolate the source of your backlash by mounting a dial indicator to something other than the table, e.g. the column or the saddle then set the dial indicator tip to the end of your table. Remove the stepper motor and the AC bearings. Push the table in one direction and set the DI to zero. Now push the table in the opposite direction and note the DI reading. It should be zero but if it isn't then you have clearance in the ball screw/ball nut assembly. This is a test I have not done yet but intend to do when I get back in the shop on Tuesday.
I have done the test Dave described in his post above and I have zero screw movement in relation to table movement with the AC bearings assembled and preloaded. This is telling me my backlash problem is not with the bearings. Hopefully I will find the source of backlash is in the ball nut.
Tom S.
Newbie question: does the tightness of the gibs affect backlash?