Ch 0429 / 38
Step 04.29 — B drive: upper frame face down, two M5×30 BHCS¶
Step 29 of 38 · Chapter 04 — A/B drive units and front idlers
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Gather for this segment — steps 04.29–04.37 (~45 min)
Motion box
- F695 bearing ×6
- GT2 20 T 6 mm pulley ×1
Fasteners, Tools & Misc box
- M5×30 BHCS ×2
- M5 precision spacer ×6
- M3×30 SHCS ×3
Motor Kit box
- stepper motor, 0.9° A/B ×1
Printed parts
b_drive_frame_upper×1 · bin 04-Bb_drive_frame_lower×1 · bin 04-B
Tools and consumables
- printed
pulley_jig.stl· bin 00-jigs - caliper
- Loctite 243
- 1.5 mm hex key
- free end of the 6 mm belt reel, uncut
- masking tape
- marker
Already on the bench
- the pulley's two set screws
- the B motor with its pulley
Parts:
-
b_drive_frame_upper×1 · bin 04-B - M5×30 BHCS ×2 · Fasteners, Tools & Misc box
Do: As at Step 04.20: flat face up, drop an M5×30 BHCS into each of the two 5.4 mm holes, then turn the frame over so the heads are underneath and the threads stand up.
Check
This is a B part: no cutout and no heat-set inserts. Either one means you picked up the A frame.
What you're looking at
Manual p.77 and the same pair render: b_drive_frame_upper, laid out the same upside-down way. This is the B part, with no cutout lobe on the base plate and no insert bosses. Seeing either means you picked up the A frame.
Source: Voron manual p.77