Quote Originally Posted by cropwell View Post
Kit,

If you find reed relays in the homing circuit don't give you a consistent zero point, you could try DC-DC SSR's
To be honest I'm hoping I don't have to try anything else for quite a while. I've spent too much time messing about with the machine rather than making anything with it. I'm reasonably confident that the relays will work OK. The response time (including bounce) is specified at 0.5mS. Variation in response time is going to be a lot less than that, especially as they are safe in the control box and not being vibrated and bashed about like the old microswitches were. If the dimensional errors from all the other weaknesses in this machine prove to be small enough for the relays to become significant I shall be very happy!