Second Z-Axis Scale for Knee Mills

[OANY]

Hi all,

I’m looking at a retrofitted Bridgeport that uses a Centroid all in one package, with X, Y, and Spindle Z controls.

I’m wondering if it’s possible to add a scale for the Knee-Z the could be used to automatically compensate for knee movement.

My concern is the relatively short Z distance of the spindle and doing tool swaps that require knee movement— I’d love to be able to crank the knee down for a longer tool, but not have the machine lose its place.

Thanks for any input!

Edit:

I think this technical bulletin on adding axii is what I’m looking for:

https://www.centroidcnc.com/centroid_di ... term=TB131

[cnckeith]

short answer yep!

Z axis summing can be employed with a knee and a scale on the knee.

or you can just have the Z scale work like a DRO with the position appearing on the control position read out.