Ch 0433 / 38
Step 04.33 — B drive: set the pulley on the B motor at 6.5 mm — flipped¶
Step 33 of 38 with a helper · Chapter 04 — A/B drive units and front idlers
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Parts:
- stepper motor, 0.9° A/B ×1 · Motor Kit box
- GT2 20 T 6 mm pulley ×1 · Motion box
- printed
pulley_jig.stl· tool - caliper · tool
Do:
- Slide the pulley on teeth first, hub up.
- Stand the jig on the motor face beside the pulley, B tab toward it.
- Push it down to level its teeth underside with the B tab underside, 6.5 mm.
Check
Caliper 6.5 mm, motor face to teeth underside, hub up. ~13 mm means pulley on tab. Side by side, A high, B low.
Helper Reads the caliper aloud and says whether the pulley is the flipped one.
What you're looking at
Manual p.79: the B motor's pulley, fitted the other way up from the A drive's. The two pulley heights, 16.5 mm on A and 6.5 mm on B, separate the two belt planes; set them the same and the belts rub.
Source: Voron manual p.79 · Video: Part 3 @1:12:46