Z axis direction

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Z axis direction

This topic has 8 replies, 6 voices, and was last updated 4 February 2014 at 23:48 by Oompa Lumpa.

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4 February 2014 at 19:13 #12254
Mike Poole
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@mikepoole82104
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4 February 2014 at 19:13 #142789
Mike Poole
Participant
@mikepoole82104
I have a vmc mill to which I am fitting a DRO. At the moment I am only fitting a scale on the knee and not the quill which I usually keep locked. I think the usual convention for the Z positive movement is when the cutter moves away from the work so I would interpret this to be when I lower the table, I think I should set the DRO to register a positive movement when lowering the table. Does the forum agree?

Mike
4 February 2014 at 19:27 #142791
Ex contributor
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@mgnbuk
That is how it would be done on a CNC machine.

Nigel B.
4 February 2014 at 20:39 #142812
M0BND
Participant
@m0bnd
I agree too. Z minus will remove material, therefore as you have said, knee up = minus.

Andy.
4 February 2014 at 20:52 #142815
Mike Poole
Participant
@mikepoole82104
It seems we all think the same way so Z plus will be knee down. Thanks chaps for your input.

Mike
4 February 2014 at 22:16 #142833
Oompa Lumpa
Participant
@oompalumpa34302
So on the X axis, what would left and right be? and for the sake of completeness the Y axis?

I have my Y axis – going away and + coming towards me. X axis left is + and right is -ve

I just made it up as I went along but I have turned one of my DRO's upside down so it sits lower. So maybe I did it wrong now?

Edited By Oompa Lumpa on 04/02/2014 22:17:41
4 February 2014 at 22:24 #142836
blowlamp
Participant
@blowlamp
X + direction is with the tool moving to the right (table moves to left).

Y+ direction is with the tool moving towards the back of the table.

Martin.
4 February 2014 at 23:03 #142843
Nobby
Participant
@nobby
Hi
When i used to set the cnc machines I Know its old hat now But i used a 5mm setting peice not my best slips . using electronic hand Wheel wind the quill down carefully take a light touch . go to controller Datum set z + 5 . As martin says
Always s think in terms which direction the cutter is moving z- x+ y- etc . drifting away a bit wire eroders you can program the bottom different to the top say for backing of dies
I would have thought the knee up on a milling machine would enable the slot drill / cutter to take another
peck/cut therefor Z minus . I have my flack jacket on ready for replies

Nobby

Edited By Nobby on 04/02/2014 23:09:42
4 February 2014 at 23:48 #142856
Oompa Lumpa
Participant
@oompalumpa34302
Posted by blowlamp on 04/02/2014 22:24:17:

X + direction is with the tool moving to the right (table moves to left).

Y+ direction is with the tool moving towards the back of the table.

Martin.

Well I got one of them right anyway!

Thanks for that. I will put that "right" in the morning and more likely get the next job ready for the scrap bin

graham.
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