Anyone know how to check an external (due to old rule number 3) thread for pitch also so i can use it as a Datum ? Any simple step-by step direction would be awesome!!!
Wes can you describe the self centering aspect of a hit? Have not a clue of what you speak.
Not certain which version it rolled out with, but now in autocylinder there is a measurment strategy option to do this.
Using the Cylinder Centering Thread Scan Strategy
The Cylinder Centering Thread Scan measurement strategy performs a thread scan by maintaining the probe centered within the thread. When you use this strategy, the diameter of the probe tip must exceed the size of the valleys in-between the threads in order to prevent probe shanking.
At NIST they were running Quindos. The probe was oriented perpendicular to the thread axis. The probe touched the part 3 times to record one P.D. hit. I asked and was told it was "self centering".
Then BKulpa told me the newest version of pc-dmis has this ability. Perhaps he can weigh in on that. I am not sure the centering thread scan strategy I found is what he was referring to, and it is not the same as what I saw happening at NIST.
At NIST they said they were using a probe the size of a thread wire for that thread, the ruby went into the valley of the thread, hit each side, then collected a P.D. hit. I suspect the first two were "up" the flank from the P.D and that final hit was the ruby contacting both flanks simultaneously, (just like a thread wire does). They were collecting 4 hits, (at the cardinal points, the tip rotated 90 degrees for each location), for each level to check the P.D., the pitch, and the taper. Then with a much smaller probe they scanned the flanks for thread form checks.
I now think the only way to do this is in pc-dmis is with logic and variables. Might turn ones brain to gelatin, but it should be do-able.
Wes can you describe the self centering aspect of a hit? Have not a clue of what you speak.
Not certain which version it rolled out with, but now in autocylinder there is a measurment strategy option to do this.
Using the Cylinder Centering Thread Scan Strategy
The Cylinder Centering Thread Scan measurement strategy performs a thread scan by maintaining the probe centered within the thread. When you use this strategy, the diameter of the probe tip must exceed the size of the valleys in-between the threads in order to prevent probe shanking.
At NIST they were running Quindos. The probe was oriented perpendicular to the thread axis. The probe touched the part 3 times to record one P.D. hit. I asked and was told it was "self centering".
Then BKulpa told me the newest version of pc-dmis has this ability. Perhaps he can weigh in on that. I am not sure the centering thread scan strategy I found is what he was referring to, and it is not the same as what I saw happening at NIST.
At NIST they said they were using a probe the size of a thread wire for that thread, the ruby went into the valley of the thread, hit each side, then collected a P.D. hit. I suspect the first two were "up" the flank from the P.D and that final hit was the ruby contacting both flanks simultaneously, (just like a thread wire does). They were collecting 4 hits, (at the cardinal points, the tip rotated 90 degrees for each location), for each level to check the P.D., the pitch, and the taper. Then with a much smaller probe they scanned the flanks for thread form checks.
I now think the only way to do this is in pc-dmis is with logic and variables. Might turn ones brain to gelatin, but it should be do-able.
