Mechanical CAD Designer — Glass Bangle Cutting & Joining Machine Ended

We're building a benchtop-to-production machine that converts a drawn glass spiral into finished closed bangles — scoring, snapping single turns, dropping each ring onto a
travelling mandrel, flame-relieving and flame-fusing the joint under a spring-limited press, then discharging by gravity. We have a working parametric CadQuery model and a
frozen design specification (Rev A). We need a CAD designer to take it to manufacturing-ready.

Target throughput: ~1 bangle/second, single lane. Bangle range: 54–64 mm ID, ~2.5 mm section, soda-lime glass.
Scope of Work

- Convert / rebuild the existing parametric model into clean production CAD (SolidWorks / Fusion 360 / Onshape — your call, state which)
- Produce a fully constrained assembly with named bodies, materials, and a mate/joint tree
- Detail every part per the spec's §6 part list (~20 parts): frame rails, sprockets, roller chain, mandrel pallet, helicoid seat, press bell-crank + spring cartridge, cam rails
(cycloidal profile), burners + manifolds, cutting head, drop guide, discharge bin
- 2D manufacturing drawings with GD&T, tolerances, and title blocks for all "make" parts
- A complete, costed BOM (make/buy split, materials, quantities)
- Interference and clearance checks across the full mechanism
- Design-for-manufacture review (weldments, machining, sheet metal)

Hard Requirements (non-negotiable design rules)

These are settled engineering decisions — the designer must preserve them, not "improve" them:
- Parametric throughout — driven by a master parameter block; no hard-coded dimensions
- Self-adjusting locating features — everything must work across the full 54–64 mm ID range (an 18% spread)
- Helicoid mandrel seat with vertical riser for passive joint clocking (bangle is a one-pitch helix, not a flat ring)
- Spring-set press force (~1.3 N), not cam-position force; hard stop sets flatness
- Force path never through cold glass — presser → joint → anvil only; cold-arc hold-downs ≤ 0.3 N
- Two-bank burners: joint burner at 90°, relief burner opposite at 270°
- Fillet all internal corners; no sharp internal edges

Deliverables

1. Native CAD files (parametric, editable)
2. STEP export of the full assembly
3. Dimensioned 2D drawings (PDF + native) for all make parts
4. BOM (CSV/Excel): part, qty, material, mass, make/buy, HOT-near-flame flag
5. Interference/clearance report read less