Help needed to get my 7i76E + 7i85S + 7i73 on my mill going.

It sounds like you have a 5V Vref?

Spindle speed starts at 1rpm and goes up in 100rpm increments for each push of the + button.

With a scalemax of 2000 you would expect a voltage of 0.25V per push of the + button. Which is what you have.

With a scalemax of 5 rpm (why?) Spindle-on gives 1 rpm = 1V. Press + for 100V and that is _lots_ more than your 5rpm maximum output, and so you get the full 5V.

So, I don't think anything is wrong at the LinuxCNC end.

tecno wrote:

"Spindle speed starts at 1rpm and goes up in 100rpm increments for each push of the + button."


That is not the case = starts at 1 and then 101 after 1 push on + but no more after that even if you push 5 times or more!

That's odd. Which LinuxCNC version?
I don't even think that there is a speed limit configurable that might be wrong.

You are looking at the motion.spindle pins?