Bearing Turntable Base

implemented unverified

A lazy-susan base plate with a precise 608-bearing seat and a countersunk screw pattern — mechanically credible parametric CAD in three operations.

Turntable / lazy-susan base plate around a standard ball bearing (wave R5, pure recipe): a rounded plate with a press-fit bearing seat in the center — pocket, through bore and a probe-verified retaining lip — and a countersunk bolt circle for mounting. The plate is a lightening canvas, so the phyllotaxis spiral applies as an ordinary modifier that respects the seat and screw keepouts.

Why it matters: A pure recipe archetype: three declarative operations build the entire part, and a phyllotaxis field modifier can lighten it without touching the bearing seat.

Built from a real example — orbit to inspect.

Declaration example

A minimal product declaration for this archetype — exposed parameters at their defaults. Validate and build it with forge validate / forge build.

schema: product/v1
id: my_bearing_turntable_base
archetype: bearing_turntable_base_v1@1

params:
  plate_l: 110mm
  plate_w: 110mm

modifiers:
  - id: add_phyllotaxis_field
    target: plate_lightening

Parameters

parameter	type	default	range	role
`plate_l`	`length`	`110mm`	`60mm … 200mm`	functional	exposed
`plate_w`	`length`	`110mm`	`60mm … 200mm`	functional	exposed
`thickness`must swallow the bearing width plus a floor	`length`	`9mm`	`8mm … 16mm`	structural
`corner_r`	`length`	`10mm`	`2mm … 30mm`	aesthetic
`bearing`	`choice`	`608`	`608 \| 625 \| 6001`	functional
`fit`	`choice`	`press`	`press \| slip`	manufacturing
`screw`	`choice`	`M4`	`M3 \| M4 \| M5`	assembly
`bc_d`mounting bolt circle diameter	`length`	`88mm`	`50mm … expr(min(plate_l, plate_w) - 18)`	assembly
`screw_count`	`count`	`4`	`3 … 8`	assembly
`min_web`	`length`	`4mm`	`3mm … 10mm`	manufacturing