Sheet Metal

[d.evans]

I understand that PCDMIS CAD++ has the ability to find sheet metal features when they aren't where they are supposed to be because of the inherent inconsistency of sheet metal in general. BUT, one the software finds the feature, how does it compensate for the difference in where it actually is vs where is should be? Are these features doomed to show up as out tol? How do you compensate for this in the program?

3.7mr3

[Matthew D. Hoedeman]

Well, if the feature does NOT match the cad, then yes, it is out of tolerance. If the feature is acceptable where it is (form and function) you can manually type the new nominals in and let it check there. Out is out, so unless you get a deviation from your customer, yes, it is out and you must report it that way.

[kbotta]

A useful tool with the edge points, is to use it to 'find' edges, and check a surface at a known distance from that edge. You can modify the parameters pretty much to your like-ing.

[Paul Sarrach]

evans, I confuse easy. could you explain this a little better to me. " find sheet metal features when they aren't where they are supposed to be because of the inherent inconsistency" Are you refering to the " FInd Hole" feature or what?

[BSchwark]

Are you using Cad? "because of the inherent inconsistency of sheet metal in general" how much are you talking about +/-.005 or +/-.500?


BS

[d.evans]

evans, I confuse easy. could you explain this a little better to me. " find sheet metal features when they aren't where they are supposed to be because of the inherent inconsistency" Are you refering to the " FInd Hole" feature or what?

Yes, "find hole" is exactly what I'm referring to.

[d.evans]

Are you using Cad? "because of the inherent inconsistency of sheet metal in general" how much are you talking about +/-.005 or +/-.500

BS

I think I've already got my question answered.

[Paul Sarrach]

aYa, think? You stated comensate, Its just as it nomally does with location of a feature.

Now how it finds the hole, from what I can tell, is some macro in the program, that automaticly start a seach with the probe for a change in, say a Z height, within a set parameter. If it does not find it it asks for more direction from the operator.

[jjewell]

D.Evans,

Find hole is a macro written to create a new "target" for the machine to drive to measure only. It only temporarily changes the target position of the hole, it still projects it to the nominal position and compares the actual found position to the nominal you keyed in, this has nothing to do with whether you use cad or not. CAD is just a tool to put nominal values in instead of keying in the values.

The other valuable tool to use when measuring sheet metal is "relative measure". If you have a group of holes out, lets say 3mm , find hole on the first one only, then use relative measure on the others , again, it temporarily adjusts the target, nothing to do with the nominal vs actual comparison.

HTH