Best way to create cylinder by using Portable CMM (Romer)

Normally I create two or more circles and construct cylinder from them and if I use auto feature to create those two circles then I have to define correct x,y and z nominals and correct normal vectors to create those circles other wise it will give error of --math failed--in creating cylinder from those circles.

Now if I have to check parallelism of two big bores with respect to each other than what is the best way to measure those cylinder.

Can I use Auto cylinder option to measure those bores -- If yes than what will I use in x,y and z nominal of those auto cylinders and what else I need to do to measure those bores. I will be measuring those bores from inside so what is the best way to measure so that I will get right diameter of bore too after probe compensation.

Thanks in advance --

tobynt over 16 years ago

what version of PC Dmis are you running?
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catguy over 16 years ago

If you are looking for the parallelism between the two bores, and are not concerned with their locations, simply construct each bore by taking hits.
Make sure your probe is as normal to the I/D surface as can be. Start at the bottom and take 3 hits as you would a circle, take another 3 hits about midway along, take another 3 hits at the top of the bore, hit the done button and you should have a cylinder. Repeat for the other bore.
The number of hits you take in each circular pattern, and the number of circular patterns, will depend on if you want to factor in the form of the cylinder, but if you want the parallel of each axis, minimal hits should suffice.
You may want to make sure you are in "Cylinder" guess mode.
Then just ask for the parallelism of cylinder 2 to cylinder 1.
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