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Creative suggestions on probing sheet metal

matl59
Im working with a gantry style machine and a large cylindrical part with a sheet metal section. In the sheet metal all the way around the circumference of the part are holes that I need to check positional accuracy of. I was going to use a shank type stylus but it appears that I'm limited to 5 degree incriments in PC-DMIS and this will not allow me to probe the holes at a perpendicular angle thus skewing their position left or right depending on the angle used...I've read in other posts just how much people dislike these styli for this very reason...

I can not probe the edges of the sheet metal with a normal ball type stylus without going to far in or out which also skews the results.

I've been told they've used plugs here in similar situations to allow for probing on a more substancial surface but I'm sure the accuracy of probing the plugs is also questionable. We'll probably be goin this route but I'd be curious if anyone had any thoughts. There is over 100 holes so thats alot of plugs to have made not to mention the amount of time lost during the installation and removal of the plugs for each part probed...

Wish I was able to calibrate and program the probe for all the crazy angles I'd need. Then I'd give the shank probe a try.
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  • Use your sheetmetal features like sample hits and auto features. Wait until Matt sees this post, he'll tell you. One of PC-DMIS's strengths is sheetmetal.
    I saw it, BUT, it sounds to me like it IS one of the situations where Pcdmis falls short.

    Sounds like it is a ROUND (cylinder) of sheet metal with holes pierced in it. If this is the case, then sample hits do no good what-so-ever since you have a hole with "unlimited" depths required. The "top" and "bottom" hits can be at the same depth, but the two "side" hits need to be at a different depth to hit the part. AND, since they are all around this cylinder, using 4 (or more) edge points, then constructing a circle won't work since you would need a "workplane" for each hole and so on. Been thinking on it, can't think of an answer that will get it done.
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  • Use your sheetmetal features like sample hits and auto features. Wait until Matt sees this post, he'll tell you. One of PC-DMIS's strengths is sheetmetal.
    I saw it, BUT, it sounds to me like it IS one of the situations where Pcdmis falls short.

    Sounds like it is a ROUND (cylinder) of sheet metal with holes pierced in it. If this is the case, then sample hits do no good what-so-ever since you have a hole with "unlimited" depths required. The "top" and "bottom" hits can be at the same depth, but the two "side" hits need to be at a different depth to hit the part. AND, since they are all around this cylinder, using 4 (or more) edge points, then constructing a circle won't work since you would need a "workplane" for each hole and so on. Been thinking on it, can't think of an answer that will get it done.
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