RepOlaRap
This is still in draft. I'm just putting down my thoughts and plan to edit it as I proceed with my prototyping:
The Polar RepRap, "RepOlaRap", currently only discusses an X+Y axis robot. I plan on attacking a Z axis once I have a working prototype to test the resolution, positioning accuracy and repeatability, and software complexity for the X+Y.
Structural parts from top to bottom:
Build platform, 14cm radius disk, 15mm thick
- Hole + thrust bearing at center. - MDF? - counter top laminate on bottom for hardness, extending out partially to form belt constraint (?) - groove for belt placement around perimeter?
Top Bearing Race, ring, radius: 13cm outer, 8cm inner, 4cm thick.
- 16x 6mm holes drilled every 22.5 degrees, alternating at 9cm and 12cm radius. - 16x 5mm stainless steel balls.
Upper Radial Arm Platform, 15mm thick
- general shape is a disk 14cm diameter, with an offset half a diagonal square 20cm per side extruded outward. - MDF? - hole drilled for interface bolt from thrust bearing on Build Platform. - counter top laminate on top for hardness on area under bearing race. - Three cut outs: - Two for encoder device and wiring for absolute radial position of Build Platform. - One for radial arm bolt + thrust bearing. - Build platform motor assembly will attach to this.
Lower Radial Arm Platform, 21cm radius disk, 15mm thick.
- Hole + thrust bearing at center. - MDF? - cemented/glued securely to Upper Radial Arm Platform. - One long cutout or groove, 1cm x 9cm, for encoder wiring. - counter top laminate on bottom for hardness, extending out partially to form belt constraint (?)
Lower Bearing Race, ring, radius: 16cm outer, 11cm inner, 4cm thick.
- 16x 6mm holes drilled every 22.5 degrees, alternating at 12cm and 15cm radius. - 16x 5mm stainless steel balls.
Base, 46cm x 46cm square, 15mm (19mm?) thick.
- Hole drilled at center for interface bolt from thrust bearing on Radial Arm Platform. - MDF? - Cut out for encoder device and wiring for absolute radial position of Radial Arm.
TODO: Image to come; saving work so far.