We have a part that is a strip of metal .004" (.100mm) thick that is curled into a circle. Our customer has a spec on their print that when constrained within a certain diameter a profile of .250mm is required for the I.D. of the part. Currently we use a fixture (I.D. to match a spec'd "Mating Diameter") to constrain the part to the described diameter. The two ends overlap by 4mm or so.
The profile references the ID of the constraining circle as datum "A".
How would you measure the profile of this part on a vision machine?
At first we were measuring the diameter using constructed arcs that were measuring the ID surface of the constrained circle since we cannot "see" the OD of the part and applying a profile requirement within our software. Then my engineer came up with that he needs to define the center of each constraining diameter before the part is measured and then the profile requirement is applied. The profile measurements from the second method are much greater than the first method.
We know the purpose of this part as our customer is very forthcoming with information although the part itself is very proprietary. The part needs to be able to "seal" against the ID of the constraining I.D. We/they also know the overlap is a design concern and is the reason for the profile specification.
The profile references the ID of the constraining circle as datum "A".
How would you measure the profile of this part on a vision machine?
At first we were measuring the diameter using constructed arcs that were measuring the ID surface of the constrained circle since we cannot "see" the OD of the part and applying a profile requirement within our software. Then my engineer came up with that he needs to define the center of each constraining diameter before the part is measured and then the profile requirement is applied. The profile measurements from the second method are much greater than the first method.
We know the purpose of this part as our customer is very forthcoming with information although the part itself is very proprietary. The part needs to be able to "seal" against the ID of the constraining I.D. We/they also know the overlap is a design concern and is the reason for the profile specification.