Tread Set
AssemblyThe full run of identical wedge-shaped treads plus the spacer rings between their hubs; rotating each tread before clamping sets the rise and the helix. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Bill of materials for Tread Set
4 top-level lines as of r162335| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Wedge Tread 5 parts | spiral-staircase-tread | 12× | 12 | 0 | assembly |
| 2 | Spacer Ring | spiral-staircase-spacer-ring | 12× | 12 | · | part |
| 3 | Tread Hub Bushing | spiral-staircase-tread-bush | 12× | 12 | · | part |
| 4 | Riser Guard Bar | spiral-staircase-riser-bar | 11× | 11 | · | part |