At the beginning of each of my shifts, I calibrate my stylus to 0.001 mm. 80% of the time I only use it in position a0 b0. And when it shows 0.002 (or even 0.003) I start wiping everything in the world until it is 0.001. Sometimes it takes a long time. How do you solve this problem?
I'm surprised that none here asked a question about the probe type... ? TP2 or LSPX is not the same...
Calibrating before each part allows taking into account the relative dispacement of the artifact from the scales, because of the temperature changing...
If the measurement lasts a little time, this parameter can be forgotten. But sometimes, the part stays a long time on the granite, so it can be important to re-calibrate.
This is also the case after a little collision, or after a tip changing when you're looking for a hight accuracy, even if the uncertainty won't go under some µm, remove the max of causes will help...
A stddev on a LSPX1 L50 D5 bigger than 0.5 µm calibrated by 25 hits just shows that there's a dust on the artifact / tip. So a cleaning can be a good idea !
The same value of stddev on 5 hits and on 25 hits doesn't mean the same thing at all...
The statistical extent on different radii of the tip with 1 µm stddev can give 4 or more µm of sphericity of the tip.
Just my opinion...
Good point on the probe type. I am using a Renishaw SP25-M. It obviously scan calibrates all angles not previously calibrated. When I am calibrating probes/angles I have used before, I have it set to 13 points on 3 levels. For tight tolerance parts, I will run the scan calibration even if the probe/angle has been previously calibrated. And yes, I use a master probe. As long as the probe/cal sphere is clean, I get .0000 stddev.
Good point on the probe type. I am using a Renishaw SP25-M. It obviously scan calibrates all angles not previously calibrated. When I am calibrating probes/angles I have used before, I have it set to 13 points on 3 levels. For tight tolerance parts, I will run the scan calibration even if the probe/angle has been previously calibrated. And yes, I use a master probe. As long as the probe/cal sphere is clean, I get .0000 stddev.
