How to measure positional tolerance without CMM?
How to measure positional tolerance without CMM?
(OP)
What is the best way to measure/inspect a positional tolerance of a circular magnet? For instance... Position Tolerance .002 |A|B|.... Datum A is outer diameter (ø0.512), Datum B is flat surface.. Thickness of magnet is .130 and Thru hole at the center of the magnet is ø0.033 this is where the Position tolerance is called out. Please Help I hope I have included all the necessary information.





RE: How to measure positional tolerance without CMM?
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RE: How to measure positional tolerance without CMM?
RE: How to measure positional tolerance without CMM?
Dave D.
www.qmsi.ca
RE: How to measure positional tolerance without CMM?
Assuming basic abilities & equipment in benchtop / open setup metrology:
1) Put magnet into a collet, holding on the datum feature diameter. Put collet in holder on a stand or lathe chuck. The axis of the collet simulates the datum axis of the datum feature (diameter)
2) Find the largest gage pin that will fit into the hole; put it through the hole
3) Using a deflection probe, master your indicator vertically at the axis of the collet
4) Probe the top of the pin and subtract half of the pin diameter. Record this as your delta-Y
5) master your indicator horizontally at the axis of the collet
6) probe the right side of the pin and subtract half the pin diameter. Record this as your delta-X
7) Use the pythagorean theorem to establish the radial error of the position of the hole.
8) Double the radial error to get the diametral error, which is your positional error.
Hope that helps.
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: How to measure positional tolerance without CMM?
RE: How to measure positional tolerance without CMM?
RE: How to measure positional tolerance without CMM?
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com