Mazak 510c-II Spindle/tool problems

[Zoffen]

2006 Mazak 510C-II with a Matrix Controll.

 

Recently, while hogging with a 3" facemill @ around 900RPM, @ random points the spindle would start making a noise that seemed like a dying dog howling. The sound was definatly cyclic in nature. After stopping the machine to investigage and finding we couldn't reproduce the noise, we would start running the program again and all was fine untill the next day, when the noise came back. This is the same cutting parameters, they varied from 125 IPM @.050DOC to [email protected] DOC for that tool (in mild steel)

 

This started last week. We haven't run any new programs on the machine as now other things are acting up

 

Now when changing a tool, the drawbar will catch and engage the tool but the tool will not be fully seated into the taper. when u turn on the thru spindle coolant you can see it shooting out the gap between the taper and tool holder.

 

Any hints on to what our problem could be?

 

What could that noise have been? I feel it has something to do with some spinning mechanism in the drawbar assembly.

 

thanks for the help!

[Guest SAIPEM]

I've seen similar things on Fadals.

 

They use spring washers in the drawbar assembly.

When they go bad, you'll start dropping tools.

[Robert Ouellette]

yup sounds like the draw bar is done. the belleville washers are not producing enough clamping force and your facemill was bouncing in the taper. thats what you were hearing. we had same thing last year on one of our older mills. had the drawbar rebuilt and all was good after.