Machsupport Forum
Mach Discussion => Mach4 General Discussion => Topic started by: awleaphart on May 28, 2018, 08:06:53 PM
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Hello,
My Z goes down when jogging the -z button and it goes up when jogging the +z button. In my homing setting its set to home Neg. direction?? If I change it to positive it homes down towards the table. Should I have any homing setting in the output settings -under homing? Al my setting are set under Homing and soft limits.
Anthony
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Hi,
the norm is to have the machine co-ordinate zero at the top of the Z travel.
Therefore any machining operation where the spindle moves down (Z-) from its rest
position is at a negative Z co-ordinate. Note this is machine co-ordinates not work co-ords.
The usual procedure is to jog down (Z-) to the surface of the material , zero the Z axis (work co-ordinate).
There after a positive Z DRO means 'above' the material surface and negative Z means 'below' the surface
ie cutting and you need to concentrate.
Craig
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Hi,
if you follow that then:
My Z goes down when jogging the -z button and it goes up when jogging the +z button. In my homing setting its set to home Neg. direction??
is perfectly correct.
Craig
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i have had enough fun with Z on occasion. question the z is moving in the minus direction but which direction is the dro moving. go to the middle and zero then go down are the numbers
counting up negative. then try the same above zero and see if the numbers are counting positive. it sounds like you are backwards.
mark
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Al my setting are set under Homing and soft limits.
You should set the INPUTS homing points also.
In my case I have six end switches, normally open to ground and the inputs are pulled up. Z Home and Z++ are the same, X Home and X- - are the same, and Y Home and Y++ are the same.
When homing, the limit function is ignored, after homing the limits are active. Setting Z Home POS, it homes upward.