I have a custom probe that is a chisel tipped stylus from a contour tracer configured to be mountable on a scanning probe head. My question is how can I go about trying to qualify this tip. I am sure I may have to make some manual entry adjustments. I am intending to only trace with it in 2D so radius comp and X,Y,Z offset is what I am looking for if I can get it. Any thoughts on how I might go about this would be appreciated.
Well, if it's off a contour tracer, it's a radius. After describing in the custom probe builder utility, can you just change calibration mode to user defined and put the start angle at 30 degrees or so? Not sure if PC-DMIS can accept a tip diameter that small, but there's only one way to find out...
I'm not sure you can do it, but maybe someone else here can help. Most of the tips you describe that I've seen have a fairly small radius (.003in) and is basically in one axis. It's not a spherical tip. Unless PC dmis allows to calibrate a tip using a cylindrical standard, I'm not sure how that would work.
It's an interesting challenge though, so i might give it a shot.
For the measurement of contours we can use spherical or conical tips (conical tips with spherical end) and minimum radius of 0.075 mm. Spherical tips – Standard radius min: 0.15 mm Contour measurement tips (tip R0.075 for internal features ) No special calibration is needed. We are using standard spherical tip calibration. This ensures absolute correlation among all the tips on the CMM. For the calibration a small calibration artefact is to be used (5 to 8 mm) we can use another tip as calibration sphere. To evaluate the results we refer to the same parameters as for the standard tips – StdDev and PrbRdv.
The measurement is to be done with continuous unknown scan with a speed between 0.5 to 3 mm/s according to the contour radiuses. The point density can be kept on 100-200 pts/mm. The scan offset force is to be kept around a 0.06N (sensors X1C / X1H).
I wonder if the offset force can be reduced to .03N. I doubt it would be much of a difference, but our contour machine uses that force and it still leaves a slight line on the part after a trace.
Also, what are your thoughts on aluminum parts? I'm assuming that tip would be garbage after a couple parts with a tip radius that small. I'm asking for a friend
Using a X1H sensor. The radius of the chisel is not conical or spherical more planer. Think of it as cylinder sliced at a steep angle and a .025mm radius but at the sharp tip. My thought is to measure the master ball and calculate the compensation and offsets. Only suitable for linear contour scans. Thank you for the parameter suggestions since that was part of my question.
its very interesting, can you show photos of your stylus ?
i was doing the same mad things on another software in previous work it was really fun three days while there was no much work to be done. Ended with some quite nice results in tests but had to finish the project quickly . My goal was to measure some radius faster on CMM with easier acces and not play with this boring form tracer with its problematic software (...)
I will get you the picture when I get in tomorrow. I never finished this project. PC-DMIS is not as friendly editing the correction of offsets as other software I have used.
