I was wondering...(can you smell the smoke?) On manual knee mills there are often ways to combine the knee and quill scales in the DRO to directly add/subtract from one another, giving only one combined Z reading. This part would be easy enough to do in HAL on a CNC. Add/subtract the quill encoder to the knee's linear encoder(scale). If the drives were enabled (but not necessarily cutting), the quill would even 'chase' the knees position trying to hold a commanded Z. But how would you change the soft limits? You basically need to be able to add the knee's position delta to each the Z+ and Z- limits. Are those accessible in HAL? On a manual bridgeport moving the knee up and down for different tools w/ greatly varying lengths (endmill vs tapping head) is de rigeur. Just wondering if the same can be accomplished on a CNC during tool changes to stay within the quills range of travel and preventing re-touching off each time.
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