Measure a rubber band or O-ring

My name is Lars Engstrup and from Denmark.

I have a task where I need to measure a diameter on a thin part made of rubber (like a rubber band or O-ring).

But when the part is made of rubber and deformed (not round) will calculation of the diameter not be possible by using the normal circle calculation program in PC-DMIS. But I need a method to calculate the circumference/length of the surface/contour on the diameter.

The diameter will be measured with optical scan at a Mycrona CMM.

What opportunities are there in PC-DMIS CAD + + (version 4.2) to calculating the circumference / length of the contour of a curve.

Mikeg over 7 years ago

If I'm just looking for a diameter or something simple like concentricity/perp/flatness I don't use an alignment. If its a quick manual dimension and that's all I need it works fine. yes I know im suppose to have an alignment but its worked for me so far.
knock, knock
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
acgarcia over 7 years ago in reply to Mikeg

Kind of like the gage tools making the optiv a digital optical comparator.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
acgarcia over 7 years ago

Ok, so o-rings are pretty simple looking.

What about these seals. They are circular like o-rings but have square cross section, Would I be able to measure the height?

I'm trying to upload the attachment but it says exceed my usergroups limit? what's that?

maybe this link works for yall?

https://drive.google.com/file/d/0B5n...ew?usp=sharing
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
acgarcia over 7 years ago in reply to acgarcia

A surface point? but how would I establish level at 0?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
bfire85 over 7 years ago

If they are reasonably flat, you don't need to do all 6 degrees of freedom. A simple surface point would suffice, and just translate in Z. If you really wanted to level, you could do three surface points.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
acgarcia over 7 years ago

So some of the smaller o rings come out pretty circular and the optiv can scan the edge pretty well. The larger o rings that lay on the table in an oblong shape aren't being scanned well. When I click the 3 points to measure the circle, the o ring itself doesn't lay in the roi.

How do I get the optiv to follow the physical part? Also, would I still be able to get a diameter dimension out of it?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel