RepRap: Blog

I put the RepRapMicron through a few more paces and found the Axis Driver I had fitted wasn't quite concentric and didn't have enough tension on the anti-backlash bands. Here's how to fix:

To put more tension on the bands, move the axis so that there is minimal band tension. Lift the groups of bands one group at a time with a screwdriver, and slip the booster in underneath. There are no fasteners, it's held there by band tension and lugs.

Then loosen the two screws next to the bands a bit so that the bar supporting the bands can be moved around. While driving the axis, adjust the position of the bar for minimum unwanted wriggle of the drive screw. I do this by watching the squared protrusion that contacts the limit switch. When it is in a good position, carefully tighten the two screws again.

I tighten the screws in gentle increments alternately until they're tight. This will all minimise unwanted axis deviation. It's a shame this is still necessary, but at least it's much simpler to do than the previous Axis Driver design!