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Ch 0227 / 44

Step 02.27 — Fit the 16T pulley to a Z motor at 10.7 mm

Step 27 of 44 with a helper · Chapter 02 — Z drives, Z idlers, Z rails, deck panel

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gather Gather for this segment — steps 02.27–02.28 (~25 min)

Motion box

  • GT2 16T pulley ×4

Fasteners, Tools & Misc box

  • M4×4 set screws ×8
  • M3×8 SHCS ×12

Motor Kit box

  • NEMA17 Z motor LDO-42STH48-2004AC ×4

Printed parts

  • z_motor_mount_a ×2 · bin 02-Z0, 02-Z2
  • z_motor_mount_b ×2 · bin 02-Z1, 02-Z3

Already on the bench

  • the four Z motors with their 16T pulleys

Parts:

  • NEMA17 Z motor LDO-42STH48-2004AC ×4 · Motor Kit box
  • GT2 16T pulley ×4 · Motion box
  • M4×4 set screws ×8 · Fasteners, Tools & Misc box

Do:

  1. Check the tooth count: the only 16T pulleys in the printer.
  2. Slide one on each motor so motor face to pulley underside is 10.7 mm.
  3. Rotate so a set screw meets the flat; tighten both with threadlocker.

check Check

On all four, 10.7 mm on the caliper, the tooth band level with the 80T it will drive, no slip under hand force.

helperHelper Counts each pulley's teeth to 16 and reads the 10.7 mm caliper aloud.

What you're looking at

Manual p.38: a Z stepper motor with its 16T pulley. The Z motors are the only place in this printer that uses 16T. The 20T pulleys elsewhere look identical, and fitting a 20T here silently changes the gear ratio the firmware assumes. See the glossary.

tip Tip

when all four are done, physically remove every remaining 16T pulley from the bench so one cannot end up on an A/B motor in Chapter 04. src

tip Tip

The pulley may sit better flipped, depending on the motor. What matters is where the teeth end up, not which way the boss faces.

Source: Voron manual p.38 · LDO Build Notes (Rev D) · Video: Part 2 @1:15:06

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