Step 02.17 — Fit the 20T pulley to the 5×60 shaft, 33 mm out¶
Step 17 of 44 with a helper · Chapter 02 — Z drives, Z idlers, Z rails, deck panel
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Gather for this segment — steps 02.17–02.21 (~35 min)
Motion box
- 5×60 mm shaft ×4
- GT2 20T 9 mm pulley ×4
- 625-2RS bearings ×12
- GT2 80T pulley ×4
Fasteners, Tools & Misc box
- M4×4 set screws (pre-threadlocked) ×16
- M5 precision spacer 1 mm ×16
Belts, Chains & Fans box
- Gates 2GT closed loop 6 mm × 188 mm ×4
Tools and consumables
- caliper
Already on the bench
- the four shafts with their 20T pulleys
Parts:
- 5×60 mm shaft ×1 · Motion box
- GT2 20T 9 mm pulley ×1 · Motion box
- M4×4 set screws ×2 (pre-threadlocked) · Fasteners, Tools & Misc box
Do:
- Slide the 20T pulley on so 33 mm of shaft protrudes on the long side.
- Rotate until you see the D-cut flat down a set-screw hole.
- Fit both set screws with a hex driver, not a ball-end.
Check
One set-screw hole showed the flat before the screws went in; 33 mm from the long shaft end to the pulley's near flange.
Helper Reads the caliper aloud: 33 mm from the long shaft end to the pulley.
What you're looking at
Manual p.32: the Z drive's shaft assembly. The 5 × 60 mm shaft is the drive's axle; the 20T pulley is what the long Z belt runs over. A set screw is a headless screw that clamps a pulley to a shaft.
Caution
Rev D+ / LDO: the kit's M4×4 set screws arrive with threadlocker pre-applied — do not add more. If a screw has clearly been used before or has no visible compound, add Loctite 243 and keep it off the printed parts. src
Source: Voron manual p.32 · LDO 350 Rev D BOM