I'm seeing signs on my tool holders and my work pieces that lead me to believe the pull force from my draw bar is not up to bar. During light cuts i can see marks indicating the tool holder is moving in the spindle. It doesn't happen during heavy cuts.

I don't have a spindle draw bar force gauge. I looked around and I see they can be had for about 1k.... I'd prefer not to shell out if I will only use this thing once every few years.

Would it just be wise to go ahead and replace the stack of belville washers on the drawbar? Is this something where you need a gauge to verify or if you just replace the washers it will be correct?

How difficult is it to access these parts?

Anything I need to be aware of safety wise while trying to get to them?


Machine is 1988 MV-40B with a 8k RPM spindle and Fanuc 10m