Any of the compass there is a limit in describing them circles. However, a circle of the desired radius can be obtained using… line. Just drill in it a large number of holes, then the first of them to insert the pin-axis and the other, stepping back to the desired distance, pencil. The circle will get no worse than that made by a compass.
Recommend to read
STAND FOR DRILL
If the drill breaks in the work is placed on the table or on the floor, I don't like, but still tolerable. But if on the ground, but still raw? So I had the idea to make a stand-"the...
“PERSISTENT” ASKS IN THE FLIGHT
So call your plane the club-model airplanes and their leader — Vadim B. Rumyantsev from the city of Privolzhsk, Ivanovo region, whose hands at the local station of young technicians...