Tweet
My apologies if these questions were answered in another post somewhere - I did spend quite a bit of time searching and reading and didn't find anything that specifically answered my questions.
I (and the engineer I work with) am/are very new to PC-DMIS. We have jumped right past touch probe stuff and are trying to make scanning work. We are measuring a piece of 1/4" mild steel which is lying horizontal and has several holes in it with diameters ranging from 0.571 inches to 0.189 inches. We intend to scan these holes as three circles - one near the top, one halfway down, and another near the bottom (for various reasons we don't really want to scan a cylinder at this point).
Initially we had problems with the scanning. When using a basic circle scan the probe would move pretty fast, but stop about halfway through the scan, start over, and then move very slowly. We were able to reduce the incidents of this happening by taking three touches at the top of the hole and aligning to the center. We could then further reduce problems by taking touches at the depths of the other scans, but this is time consuming.
Is there a way to open up the tolerance a bit so that realigning for every scan is not necessary? Is there a way to reduce the number of rescans? Is there a way to raise the speed of the second pass scan so that it's not inspiring extra coffee breaks?
Also, when we get down to the smaller holes we are often times unable to have any success and have problems with the probe crashing. Any ideas on how to stop that?
One idea we had, which sometimes helps, is to take the diameter reported by the initial three touches and put it in as the nominal for the scan. It seems we either need to allow PC-DMIS to tolerate a hole which is far (0.025" or so) from the expected nominal, or somehow change the nominal of the scan via a variable (no, I don't like the sound of that either).
Our CMM is a Sheffield Discovery D-12 with a PH6M, SP25M, SM25-1 and we are running PC-DMIS version 4.1.
Any help is greatly appreciated.
Guy
I (and the engineer I work with) am/are very new to PC-DMIS. We have jumped right past touch probe stuff and are trying to make scanning work. We are measuring a piece of 1/4" mild steel which is lying horizontal and has several holes in it with diameters ranging from 0.571 inches to 0.189 inches. We intend to scan these holes as three circles - one near the top, one halfway down, and another near the bottom (for various reasons we don't really want to scan a cylinder at this point).
Initially we had problems with the scanning. When using a basic circle scan the probe would move pretty fast, but stop about halfway through the scan, start over, and then move very slowly. We were able to reduce the incidents of this happening by taking three touches at the top of the hole and aligning to the center. We could then further reduce problems by taking touches at the depths of the other scans, but this is time consuming.
Is there a way to open up the tolerance a bit so that realigning for every scan is not necessary? Is there a way to reduce the number of rescans? Is there a way to raise the speed of the second pass scan so that it's not inspiring extra coffee breaks?
Also, when we get down to the smaller holes we are often times unable to have any success and have problems with the probe crashing. Any ideas on how to stop that?
One idea we had, which sometimes helps, is to take the diameter reported by the initial three touches and put it in as the nominal for the scan. It seems we either need to allow PC-DMIS to tolerate a hole which is far (0.025" or so) from the expected nominal, or somehow change the nominal of the scan via a variable (no, I don't like the sound of that either).
Our CMM is a Sheffield Discovery D-12 with a PH6M, SP25M, SM25-1 and we are running PC-DMIS version 4.1.
Any help is greatly appreciated.
Guy
Comment