Step 07.33 — Move the gantry, return, and re-check¶
Step 33 of 39 · Chapter 07 — A/B belts and tensioning
(no image — see text)
Parts: none.
Do: Move the X extrusion back at least a few centimetres and then forward again to re-establish the 150 mm span. Re-measure both belts.
Check
Both belts read within a few Hz of each other, at about 110 Hz, after moving the gantry and returning.
What you're looking at
Moving the gantry and bringing it back re-seats both belts in every stack and lets any trapped slack redistribute. A reading that only holds while the gantry has not moved is not a reading.
Why equality beats the absolute number here — and what to do if they won't converge
Equality between A and B matters more right now than hitting 110 Hz exactly: unequal A/B tension racks the gantry and will fight the squaring you do in Ch 06b, which releases this tension completely anyway. If the two will not converge, the usual causes in order are unequal belt lengths (Step 07.8), unequal tail protrusion at the carriage, or a belt rubbing somewhere.
Good stopping point · ~30 min since the last one
belt-rub inspection clean at all fourteen contacts, both belts reading ~110 Hz over a 150 mm span and equal to each other after moving the gantry. This tension is provisional; do not chase the number further — Ch 06b releases it entirely and Ch 14 sets it for the last time.
Source: Voron docs § Secondary printer tuning — A/B Belts · survey §7.2 Ch 07 · Video: Part 6 @0:15:01