Love of lathes.

[ex 2 Base]

It was the math part that was Greek to me. Still is, but I didn't have to design them, just repair them.

Sounds horribly familiar.

- Joe

Hello Colin and others, I have worked on repulsion motors,we had them on small compressors.To change direction of rotation we moved the brushes to a point passed the neutral position, usually marked by the manufactuer.On the more common type of repulsion motor the brushes are short circuited, some had a centifugal brush lifting arrangement so that when the motor was up to speed the brushed were clear of the comm.We never under cut their comms it was deemed not necssary, but did on other DC motors/generators. All comms were skimmed between centres, we had a machine made by Martindale for big motors/generators but smaller one was done by hand using a ground up hacksaw blade in home made holder.We had a tail stock rotating chuck for those motors which didn't have a centre both ends, such as starter motor. I made myself one as they were expensive, but I notice they are now advertised in the model engineer for about £70.Don't forget to carry out an insulation test on the motor as the lead insulation is often rubber covered with cotton and it rots and become brittle.Very interesting brings back a lot of memories, best of luck with the lathe.Ted