How to use ? - Trammel of Archimedes - ellipsograph

Step 1

On the 15 x 15 cm wooden board, measure and draw a cross with 11 mm wide sections.

With hot glue, fix precisely the four 5 x 5 cm wood pieces in each corner of the cross.

Step 2

Drill two holes in the wood slat with a No4 bit : one at 1cm an the other one at 5.5. cm of one end.

Glue a wooden pearl on the other end of the slat (or as shown a small wooden dowel).

Drill the centres of the two small wooden pieces with a No4 bit.

With a No8 bit, drill a few millimetres into the hole, enough to fin an M4 nut in.

Step 3

Using the two M4 bolts and M4 nuts, attach the two small wood parts on the slat.

Do not tighten too hard so that the parts can still rotate freely.

Step 4