Step 07.13 — A belt: S-wrap the A drive motor pulley¶
Step 13 of 39 · Chapter 07 — A/B belts and tensioning
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Parts:
- the A belt · already on the bench
Do: At the rear-right A drive unit, take the belt round the first stack, over the toothed motor pulley, and back out round the second, the S-shape on p.133. Seat the belt on the pulley teeth, not on a flange.
Check
Nudge the belt: the motor pulley indexes tooth by tooth and does not slip. The belt leaves heading forward along the right Y extrusion.
What you're looking at
The S-wrap gives a drive pulley its grip: the belt comes in over one bearing, wraps a large arc of the toothed motor pulley, and leaves over a second bearing. More teeth in contact means the belt cannot skip under hard acceleration.
Source: Voron manual p.133