Calculating DRO For Mill Z Axis

[William ChithamParticipant @williamchitham75949]

[William ChithamParticipant @williamchitham75949]

While my printer toils away I've been pondering the DRO installation on my fantasy mill. Obviously it is a knee mill with a quill and I'm wondering if a 3 axis DRO can be set up so that the Z axis displays the product of two scales, one on the quill and one on the knee? In other words any movement down on the quill would be added to any movement up on the table to show the cumulative result.

[HOWARDTParticipant @howardt]

What if you connect the scale to the knee and the reader to the quill. Then you read the distance between the two.

[Steve FParticipant @stevef]

I think Machine DRO do a gadget that sums the 2 values together. Yes its here **LINK**

regards

Steve

[William ChithamParticipant @williamchitham75949]

Posted by HOWARDT on 09/09/2019 17:32:27:

What if you connect the scale to the knee and the reader to the quill. Then you read the distance between the two.

That would work but might require a rather convoluted mechanical connection between the two.

[William ChithamParticipant @williamchitham75949]

Posted by Steve F on 09/09/2019 17:36:46:

I think Machine DRO do a gadget that sums the 2 values together. Yes its here **LINK**

Just the job, I thought it must be possible.

[Brian GParticipant @briang]

Touch DRO can do this as well, ours is set up so the head and quill are summed.  (Edit: I suppose it would be more accurate to say subtracted, as the quill extension reduces z-height)

Brian

Edited By Brian G on 09/09/2019 19:15:14

[Gray62Participant @gray62]

For the additional cost of the M-DRO summing box on top of a 3 axis display, you can buy a 4 axis display head from EMS-I that allows each axis to be displayed separately as well as allowing selected axis to be summed. I have one on my Ajax Turret mill, no complaints so far, I also have their 3 axis on one of the lathes, no affiliation, just a very satisfied customer.

Gray

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