Laser Cut Single Stage Design

I was having problems working out the full MPRT laser cut design so I thought I would try a single stage design first. It is not that I could not design a laser cut  MPRT, it is just that I was not happy with the design (i.e. too many layers). I know it can be better.

Actually even the single stage design was tricky. But eventally here it is:

The gray components are not necessary but useful for mounting.

So what we are looking at, starting at the bottom:

• The motor mount (the fixed arm), for different steppers I should add at least two more holes.
• The carry ring or output arm, (sun gear is actually on the next slice)
• The fixed ring and planets (offset for cutting)
• The upper carrier ring.

Notes:

• The gears and bolt hole have been adjusted (where required) for a laser cut width of 0.1 mm.
• The bolt holes are for M3 bolts but the final construction assumes the layers will be glued.
• It has been assumed a 2 mm dowel fixed to the planet will rotate in the carrier.
• And finally, the really small holes are for alignment pins (1.2 mm diameter by 25 mm long nails).
• The gear design is 5 turn (input) to 1 turn (output) for the single stage.
• I will wax the wood to reduce friction, may need to add a paper spacers to free up rotation of the carrier.
• The MPRT version (based on the current gear set) will be 55 to 1.

I have to double check the design measurements and lay it out for laser cut panel size.

Here is my laser cut laayout on a 600 mm x 300 mm 6 mm thick MDF board:

Next is to work out the MPRT version.

AlanX