Now that I’ve defined what success should look like, I have to start putting the pieces together. This started as a set of pen & paper drawings in my sketchbook. Then I had a friend model the entire thing in Solidworks. This model uses
- Some sheet metal or wood for top & bottom plates (blue)
- Some 3D printed brackets (green)
- 24 3D printed ABS bearing mounts
- 12 3/8″ OD bearings (between the bearing mounts)
- Three pieces of 16mm hollow square aluminum bar (grey)
- Three NEMA17 stepper motors
- Six pieces of 4mm threaded rod
- Six 1cm rods (attaches bearing mounts to square bar & bottom plate)
Before I could say this design is finished I still need to do a number of changes and tests, based on my previously stated goals:
- The 1cm rods should be supported on bearings to make movement nice and smooth.
- Bearings means a redesign of the square rod, the 1cm bar, and the bottom plate.
- The legs that will hold up the delta robot haven’t been designed yet
- Length of the 16mm square bar, length the 4mm threaded rod, and size of the plates will change once I calculate the correct numbers for the work area and accuracy that I want. I just hope the motors I have will be up to the task!
- Solidworks can simulate material stress and do other kinds of performance analysis. I should be able to test how much weight the machine can carry before I start making anything, which will help me make sure my targets are being met.