CONTEXT
So as normal, I've performed all of the major operations on the first setup. Facing, drilling, milling, etc. All that I need to do is to flip the part and face off the backside to get it to size. To ensure I get the right height, I place the part in the soft jaws after having probed the top surface of the jaw. Once I place the part into the vice all cutting will occur in Z+. For this example, the facing operation will happen at +15. Z.
For context, the machine is a Haas VF-2 with the full WIPS system, in particular, the probe measuring the z offset is the Renishaw OMP40-2.
THE PROBLEM
The problem I seem to be having is that the part is coming out 0.2mm smaller. So instead of 15.00, it will range from anywhere from 14.75 to 14.94. My gut feeling is that I am placing the part in the vice and it's sitting some way above the jaws. Which doesn't seem to make sense as I do use a dead blow hammer to seat the part into the jaws.
The machine has just been fully calibrated using the ball bar cycle and both probes have been re-calibrated for height, concentricity, etc. The problem I am having as stated above was occurring before the recent calibration (performed by two different engineers) and afterwards so I'm not sure if its a calibration problem but more a mechanical problem. I have had this problem before on other parts however most of the time I've managed to set the offset to account for the difference.
At this stage, I'm not sure what else to try and I'm looking for any ideas/suggestions from someone with more experience/knowledge, I am more than happy to try and have a part waiting for its second op sitting on my desk so can try suggestions immediately.
Setup 1
Setup 2
Probing top of softjaw for second op
and Thank You in advance for any help.
So as normal, I've performed all of the major operations on the first setup. Facing, drilling, milling, etc. All that I need to do is to flip the part and face off the backside to get it to size. To ensure I get the right height, I place the part in the soft jaws after having probed the top surface of the jaw. Once I place the part into the vice all cutting will occur in Z+. For this example, the facing operation will happen at +15. Z.
For context, the machine is a Haas VF-2 with the full WIPS system, in particular, the probe measuring the z offset is the Renishaw OMP40-2.
THE PROBLEM
The problem I seem to be having is that the part is coming out 0.2mm smaller. So instead of 15.00, it will range from anywhere from 14.75 to 14.94. My gut feeling is that I am placing the part in the vice and it's sitting some way above the jaws. Which doesn't seem to make sense as I do use a dead blow hammer to seat the part into the jaws.
The machine has just been fully calibrated using the ball bar cycle and both probes have been re-calibrated for height, concentricity, etc. The problem I am having as stated above was occurring before the recent calibration (performed by two different engineers) and afterwards so I'm not sure if its a calibration problem but more a mechanical problem. I have had this problem before on other parts however most of the time I've managed to set the offset to account for the difference.
At this stage, I'm not sure what else to try and I'm looking for any ideas/suggestions from someone with more experience/knowledge, I am more than happy to try and have a part waiting for its second op sitting on my desk so can try suggestions immediately.
Setup 1
Setup 2
Probing top of softjaw for second op
and Thank You in advance for any help.