Wear on spindle drive blocks-should I see any?

vmipacman · Sep 22, 2017

With a spring pack drawbar properly tensioned should the drive blocks in the spindle nose see any wear from toolholders? I have a CAT 40 spindle. The drive blocks had wear when I got the machine, I flipped them around so I could see for myself. They have a little new "hammering", I suppose you could call it. Otherwise the drawbar and cutting finishes seem to be fine. I only use about 20% of the machines hp, so not a ton of load. Is this the first sign I need to rebuild the drawbar?
Thanks!

ewlsey · Sep 22, 2017

Possibly. It might also indicate that you need to have the spindle taper ground.

vmipacman · Sep 22, 2017

I actually DO need to do this! I have way more runout than desired. But bearings seem fine, I was going to have it reground in place.

DavidScott · Sep 22, 2017

Could be from tool changes, something else to check.

ewlsey · Sep 22, 2017

You need to check the drawbar force after the taper is ground. If it's low, you'll need to replace the belville springs and possibly shim the stack to get it where it should be.

Ox · Sep 22, 2017

Seems to me that toolchange arm alignment and / or spindle "orient" could be players in this.

???

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Wear on spindle drive blocks-should I see any?

vmipacman

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DavidScott

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ewlsey

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Ox

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