I recently purchased a used bed mill with a Centroid control, and I am having an oddball issue that I'm hoping someone can help with.
When I enter the tool height offset library, the Z height of my WCS (G54) changes on its own to some seemingly random negative number.
Here are the steps that reproduce the problem:
1. Enter Part Setup, get to the Z axis step, and set the top of my workpiece as Z 0.
2. Bring the Z axis all the way up to home. The Z readout now shows some positive value (for example +7.4226"). All good so far.
3. Enter tool height offset library. The Z value shown at the top of the screen (for my WCS) suddenly changes from 7.4226" to some negative number (for example -4.9495"). The Z Ref value on the bottom of the screen also shows this same number (and since this is a bed mill and I'm not using a reference tool, the ZRef should be 0). Please note that I have not moved the Z axis - it is still all the way up in its home position, nor have I changed the tool or active tool number.
I made a video showing the issue: https://photos.app.goo.gl/UR1X8YAuORYqAe4E3 . The mystery Z number change is around the 2:35 mark.
The unexplained negative Z number is somewhat consistent by the way. If I repeat the process starting with my WCS Z origin on the top of a tall object (for example the 9" high surface plate shown in the video), the Z home value changes to -4.9495, and it will come up with that number consistently. But, if I start the process with my WCS Z origin at a much lower level (for example the bed of the vises in the video which is around 2.5" high), the Z home value changes to around -1.74", and again it will come up with that number consistently. So while it is consistent, notice that the difference between the starting Z origins (6.5" difference) is way different from the difference between the mystery negative numbers that it comes up with (approximately 3.2" difference). I can't explain it.
I've only been using the machine for about a week, and it worked fine last week, but now I have this issue. Any ideas?
Thanks in advance.
When I enter the tool height offset library, the Z height of my WCS (G54) changes on its own to some seemingly random negative number.
Here are the steps that reproduce the problem:
1. Enter Part Setup, get to the Z axis step, and set the top of my workpiece as Z 0.
2. Bring the Z axis all the way up to home. The Z readout now shows some positive value (for example +7.4226"). All good so far.
3. Enter tool height offset library. The Z value shown at the top of the screen (for my WCS) suddenly changes from 7.4226" to some negative number (for example -4.9495"). The Z Ref value on the bottom of the screen also shows this same number (and since this is a bed mill and I'm not using a reference tool, the ZRef should be 0). Please note that I have not moved the Z axis - it is still all the way up in its home position, nor have I changed the tool or active tool number.
I made a video showing the issue: https://photos.app.goo.gl/UR1X8YAuORYqAe4E3 . The mystery Z number change is around the 2:35 mark.
The unexplained negative Z number is somewhat consistent by the way. If I repeat the process starting with my WCS Z origin on the top of a tall object (for example the 9" high surface plate shown in the video), the Z home value changes to -4.9495, and it will come up with that number consistently. But, if I start the process with my WCS Z origin at a much lower level (for example the bed of the vises in the video which is around 2.5" high), the Z home value changes to around -1.74", and again it will come up with that number consistently. So while it is consistent, notice that the difference between the starting Z origins (6.5" difference) is way different from the difference between the mystery negative numbers that it comes up with (approximately 3.2" difference). I can't explain it.
I've only been using the machine for about a week, and it worked fine last week, but now I have this issue. Any ideas?
Thanks in advance.