The dowel should protrude just under 3mm from the top gear. Thread and glue together the three gears onto the dowel carefully lining up the teeth. The main gear has eighteen teeth and is made from three layers. Planetary gear viewed from the other side. …and fit the cover piece into place gluing it to the spacers to complete the first planetary gear module. Glue together the three gear pieces and centre them over the dowel.ĭrop the three small gears into the spider. Glue and clamp the spacer side of the gear to the spider lining it up carefully with the hole in the spider. Glue them onto one side of the gear.Ĭarefully clamp them up as the glue dries. The two spacer pieces have a slightly larger centre hole than the holes in the gears. Use the small arrow to help accurately line up the teeth. Thread and glue the three gears to the dowel and centre them along the length of the dowel. You will need a dowel 12mm diameter x 15mm long Thread the spacer into position glue it and clamp it into position at the top of the ring. Repeat this process to make up the second ring.įit the two rings into the base and glue them down. Notice how the longer tongue protrudes from the centre of the ring.Ĭlamp the parts up and let the glue dry thoroughly. Glue the third layer into place and again line it up with cocktail sticks through the location holes. Use cocktail sticks to help align the pieces as you glue them together. The centre layer has a longer tongue than the two outer layers. Each of the two ring gears is made from three layers. Cut out the parts from 3mm plywood on your laser cutter. You will need to cut out two copies of the ring gears. Start with the parts from the ringgear.pdf file.

12mm dowel: 15mm long x 1 | 55mm long x 1 | 30mm long x 1

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