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Do away with manual alignments - use Readpoint

Butch
Hi Everyone
I am fairly new to PCDMIS being a Mitutoyo programmer for the last 10 years (Booo). The training I had on PCDMIS was reliant on a MANUAL setup before going into DCC mode. By going straight into DCC mode position your probe over its start point. Then you can insert a READ POINT. Then put the XYZ origin on the READ POINT and hey presto your probe has a X0, Y0 and Z0 starting point. You can now do a rough setup by getting the CMM mode to search for your part elements.
This can still then be skipped if not required for further parts. Why go to the lengths of manual probing when the CMM will do it for you?

I am enjoying the new challenge of PCDMIS and can see that it is deep and dark. By using code instead of set routines like the Mitutoyo I realise it can be a lot more flexible. Now if I only knew all the codeing tricks?
Please look out for my questions appearing.

Butch
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  • The part origin is at the lower left in a top view which leaves all features with a positive X-Y coordinate value. The alignment translates first to the readpoint then offsets the X & Y back to the origin. Just a personal preference. For me it's always better to work in the model axis system which makes it easier to interrogate the cad (we use Catia which has a few more tools than PcDmis). Once I have my final alignment I like to verify a few features with a second opinion. More than once I botched the datum alignment and ended up loosing a lot of programming time. Another way would be to record some temporary auto features before any alignment and then pick the same features again after the alignment - the locations should match.

    As for a readpoint - just think of it as a measured feature without having to touch anything. Not quite as accurate but it gets the ball rolling. You should be able to drop the code I gave earlier into a new program and import the cad to see it run. On my system the file is at C:\Users\Public\Documents\WAI\PC-DMIS\2014.1\CAD\HEXBLOCK.CAD. Running it offline may give you a better feel if you don't have the physical demo part on hand. Once you use it a few times it will become second nature. Most of what I use readpoint for sits flat on the table but I've also done a 3D bestfit using 3 points (non-coincident, non-colinear).
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  • The part origin is at the lower left in a top view which leaves all features with a positive X-Y coordinate value. The alignment translates first to the readpoint then offsets the X & Y back to the origin. Just a personal preference. For me it's always better to work in the model axis system which makes it easier to interrogate the cad (we use Catia which has a few more tools than PcDmis). Once I have my final alignment I like to verify a few features with a second opinion. More than once I botched the datum alignment and ended up loosing a lot of programming time. Another way would be to record some temporary auto features before any alignment and then pick the same features again after the alignment - the locations should match.

    As for a readpoint - just think of it as a measured feature without having to touch anything. Not quite as accurate but it gets the ball rolling. You should be able to drop the code I gave earlier into a new program and import the cad to see it run. On my system the file is at C:\Users\Public\Documents\WAI\PC-DMIS\2014.1\CAD\HEXBLOCK.CAD. Running it offline may give you a better feel if you don't have the physical demo part on hand. Once you use it a few times it will become second nature. Most of what I use readpoint for sits flat on the table but I've also done a 3D bestfit using 3 points (non-coincident, non-colinear).
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