Step 04.28 — A drive: check your work and the belt path¶
Step 28 of 38 with a helper · Chapter 04 — A/B drive units and front idlers
Tap to enlarge
Parts:
- free end of the 6 mm belt reel, uncut · tool
- masking tape · consumable
- marker · tool
Do:
- Motor down, compare against p.76's elevation: pulley in the upper plane, level with the near pair.
- Lay the belt end across the pulley teeth, near pair and far post's upper pair.
- Label it A: REAR RIGHT.
Check
Belt path straight: belt flat on the pulley, the near pair and the far post's upper pair; no tilt, no flange contact.
Helper Sights along the belt at eye level and says if it tilts.
What you're looking at
Manual p.76's elevation and the belt reel's free end used as a straightedge. The A pulley runs in the upper belt plane, level with the near pair and the far post's upper pair.
Tip
the far post's lower pair sits 10 mm below the belt. That is correct: it carries the B belt, so leave the stack alone.
Good stopping point · ~25 min since the last one
the A drive is finished: 2-bearing near post, 4-bearing far post, frames closed snug, pulley at 16.5 mm hub-down and threadlocked, motor in with three M3×30 and the cable exit inboard, belt path checked straight. Labelled A — REAR RIGHT. This is the natural stop; do not leave a bearing stack loaded with the lower frame off.
Source: Voron manual p.76 · Video: Part 5 @1:12:36