Kiri

First geometry printed. Housing confirmed printable. Gears too small, caused binding. Rotor geometry mismatched. Motion test: 2/10. Confirmed the geometry was printable and identified where to improve.

Gears removed to test rotor clearance independently. Confirmed rotor and housing were fundamentally different geometries — not built from the same mathematical foundation. Required full redesign.

Full rotor redesign. RX-7 K=7 proportions locked in. R=28mm, e=4mm. First successful rotation and full orbit achieved. Smoothness 7/10. Rotor drifts without gears confirmed.

Full redo using corrected parametric equation. Gears introduced for first time — module 0.80, 20/30 tooth, 3:2 ratio. Good mesh, minimal slippage. PLA friction identified as major issue requiring lubrication.

Eccentric shaft and hand crank added. First complete mechanical assembly. Rotor tracked epitrochoid path under hand crank power. Kiri moved for the first time. Gear slipping under extreme load noted.

Filleted edges, cover plate with window, 4-bolt mounting. Silicon grease introduced. Shaft clearance relief added. Smoothness 8/10. Modular design proven — cover reprinted without touching other parts.

YM2707 4.5VDC motor, 5:1 external gear reduction. Arduino soft-start code. Battery powered operation. Motor driven rotation confirmed after identifying hand crank obstruction. Silicon grease on all moving parts.

Full rear plate 4-screw motor mount. First confirmed sustained motor driven rotation achieved. Eccentric shaft identified for full redesign. Brass inserts required for grub screw. Looked great at speed.

Full eccentric shaft redesign with bearing pockets in front cover and rear plate. Shaft printed vertically — wrong orientation, snapped under hand load. Bearing bore undersized due to elephant foot. Both issues identified and fixed for V1.51.

Shaft reprinted horizontal — dramatically stronger. Front joiner geometry failed under load. Motor mount gear clearance reintroduced when housing thickness changed. Shaft orientation locked in as horizontal permanently.

Single most impactful improvement of the V1 series. 608RS ball bearing pressed into rotor central bore. Rotor went from high PLA-on-PLA friction to spinning almost completely freely. Estimated 90% friction reduction. Bearing locked in as permanent feature.

Motor driven rotation achieved for 2-3 seconds before motor gear slipped off smooth shaft. Root causes identified — motor gear angular drift, eccentric shaft gear and rear section as two separate pieces causing misalignment, front cover rubbing rotor. Full mechanical redesign initiated for V1.6.