Fingers crossed it'll cut ally

[Jonathan]

Disregard steps 1 and 2, that's not safe to do if the parallel port outputs over 5v. Measure the max voltage as I said in the previous post then just desolder the switch and solder the signal output wire from the parallel port to the PCB pin of the switch which was connected to R31. Then adjust the pot untill it gives the same reading for voltage with mach3 at 100% spindle speed as it did with the pot at 100%. Good idea to remove R32 whilst you adjust the voltage, then put it back when you're sure it's right - that guarantees not to break anything. Quite tricky soldering though!

[blackburn mark]

hahaha!! yove been busy jonathan... hope you werent late up this morning

iv still got loads of drilling to do so i cant afford to pull my servo tester apart at the mo but iv orderd one exsactly the same for you to experiment with (if you agree) , PM me your address and ill send it over to you once it turns up here.

if you manage to solve the issue then let me know how you did it and we'll call it even

ps: dont worry about it if its more than you can be botherd with :)

[Jonathan]

iv orderd one exsactly the same for you to experiment with (if you agree) , PM me your address and ill send it over to you once it turns up here.

if you manage to solve the issue then let me know how you did it and we'll call it even

That sounds like a good plan :) I've sent the PM. I'll work it all out properly and take some photos of what I do when I get it.

If that voltage is 3v max then we can use the existing potentiometer to scale the voltage from your parallel port to be the same.