Switches

The Rotary switch recovered from the skip is a Santon RS-125. This is a multi-stackable system that contains rotary wafers with 180 degree contacts across the centre and a single 90 degree contact on the right, so to speak, rated at 10A @ 250V. The switch contained four switch wavers, and six contacts. Adding up, we need 2 wafer contactors for one field winding, and four rotary wafers for the forward/reverse (each waver switches live, another switches neutral for each end of the winding) other winding, making six rotary wafers and 10 contacts. Hmm, problem. The previous application only switched two the motor in a single direction as none, one, other, both.
I spent a long time messing about - I could only use a single rotary wafer with switched live for one winding, but still need four wafers for the forward/reverse winding. I dont like that idea, so wondered about modifying the rotary wafers so they just had 90 degree contacts, and each wafer could then switch both live and neutral. The problem with this is that in one configuration there is no off, and the other the switching goes forward, reverse, off - so to turn off from forward means you crashing through reverse at 1425rpm - not good.
I could make up some brass contacts out of 47thou sheet, but I still dont have enough wafers.
More to come....