Hi Guys,
Thanks for the replies.
I did some testing today with switches of various types used in various positions.
It looks like a micro switch is the only type of switch that goes fully on to fully off with no contact bounce.
I set up various switches in the vice of my VMC and pushed on them with the back of a milling cutter. They were connected up to an led to see they their state. I moved the z axis, to switch each type on and off 10+ times, and recorded each set of readings.
I found that the microswitch used in a straight push, could turn on to an accuracy of 0.005mm but would disconnect with an accuracy of 0.002mm this would have been 0.001mm but the first reading was 0.001mm different (the other 9 were exactly the same), which could have been my fault when I moved the Z axis for the first time.
I am afraid that I cannot measure the movement any better than that as my VMC only has 3 decimal points on it!!, so I would say that is pretty good.
Question is, can Mach3 software be made to trip on switch release rather than switch on, to use the more reliable reading of the zero position.
Thanks
Dom  |