Ch 06Checkpoint

Checkpoint 06

Checkpoint · Chapter 06 — Z axis (and Chapter 06b — Gantry squaring)

What you should have now — The gantry is in the machine at last, hanging on the four Z joints - you built it over Chapters 04 and 05, so it is grey here. New this chapter: the Z joints themselves, closed around the carriages, and the four Z belts run from drive to idler. CAD Z belts are cut for the 250. Chapter 06 gives the 350 length.

• Four z_joint_upper blocks fitted, each with its M5 nut seated, cutouts facing outward
• Zero 6×3 magnets used; zero z_joint_upper_hall_effect parts printed or fitted
• Four z_joint_lower on the Z carriages, four M3×20 SHCS each, all four bolted flat
• Four M5×40 SHCS in, all still light — they are torqued hot in Ch 14, not now and not in Part B
• Four Z belts routed drive → idler → clamp, teeth engaged on every pulley, none twisted
• Both belt ends clamped at every corner: the first under the lower clip and bearing block, the second under the upper clip's two M5×16; tails folded and zip-tied
• Four belts pluck to roughly the same note; nothing rubs anywhere in ±30 mm of Z travel
• The six XY-joint-to-X-beam bolts (Steps 05.38–05.39) fully tightened with the gantry held back against both A/B drives (p.122); Z belt-clamp bolts and rail screws untouched
• Gantry holds its own height on the belts; zip ties and mid-rail stoppers removed
• Z-chain parts bagged and labelled for Ch 10

Next: Ch 07 — A/B belts and tensioning — Part B (Ch 06b) below cannot start until Ch 13 Step 13.34 hands off to it.

You built a gantry hanging level on four belted Z corners. 8 gummy worms.

← PreviousStep 06.26 — Close out the mechanical Z axis

Next →Step 07.1 — Confirm the gate before you start