How do you measure a round slot that runs part of the circumference of a cylinder? Its dimensioned .380" x 1.00" (center to center of circle). I've measured both ends as cylinders and dimensioned the distance between them, but obviously that doesn't work because it's giving me a straight line distance between them, not following the surface/circumference of the part. There's a photo of the feature below. Any help is much appreciated.
Don't say, "how do I *measure* it". Rather, what are we measuring FOR?
CMMS (for the most part) inspect for 4 things:
- location
- size
- form
- orientation
What is it that you want to know? This approach has always helped me break a problem down into manageable chunks.
Secondly, what are we trying to inspect? Is it geometric (circle, plane, slot, sphere, etc), or is freeform (mouse surface, "wrapped" features, etc)? In this case, it isn't TRULY a slot (or at least, I can't tell from the picture). When I'm working with freeformed features, there's usually only two solutions:
1. shoot a bunch of autovector points (maybe using Point AutoTrigger?), Construct a Feature Set from them, and use a Profile Dimension (assuming that we have the nominals). A profile dimension will capture size, location, orientation, and form. also, we have the advantage, if AutoTrigger is used, that the next execution of the PCDMIS program will happen in almost exactly the same manner! The downside, of course, is that each execution will take much longer, as you have to hunt and confirm each individual AV Point.
2. scan the feature (maybe even use a body axis scan?) and use a Profile Dimension. Contrasted to the previous method: it gets more data (better?), and can be executed faster (better!), but each execution will differ, as we can't scan identically from run to run (worse), and it's physically easier for an operator to mess it up, lift the probe off the part, and scan in mid-air (worse!).
That's how I handle freeformed features like the one (i think?) in the picture. If you don't have a solid model, this ain't gonna work well / at all.
Don't say, "how do I *measure* it". Rather, what are we measuring FOR?
CMMS (for the most part) inspect for 4 things:
- location
- size
- form
- orientation
What is it that you want to know? This approach has always helped me break a problem down into manageable chunks.
Secondly, what are we trying to inspect? Is it geometric (circle, plane, slot, sphere, etc), or is freeform (mouse surface, "wrapped" features, etc)? In this case, it isn't TRULY a slot (or at least, I can't tell from the picture). When I'm working with freeformed features, there's usually only two solutions:
1. shoot a bunch of autovector points (maybe using Point AutoTrigger?), Construct a Feature Set from them, and use a Profile Dimension (assuming that we have the nominals). A profile dimension will capture size, location, orientation, and form. also, we have the advantage, if AutoTrigger is used, that the next execution of the PCDMIS program will happen in almost exactly the same manner! The downside, of course, is that each execution will take much longer, as you have to hunt and confirm each individual AV Point.
2. scan the feature (maybe even use a body axis scan?) and use a Profile Dimension. Contrasted to the previous method: it gets more data (better?), and can be executed faster (better!), but each execution will differ, as we can't scan identically from run to run (worse), and it's physically easier for an operator to mess it up, lift the probe off the part, and scan in mid-air (worse!).
That's how I handle freeformed features like the one (i think?) in the picture. If you don't have a solid model, this ain't gonna work well / at all.
