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Cloud Point Operator "CLEAN". Is this a Global feature and who's value carries over to the next program automatically.

bcotter@bannermetalcraft.

Have an Absolute Arm 85 w/PC-DMIS 2020R1 and Laser Scanner RS6 that inspect to from time to time.

While working with scan parts I typically crop off all the edges of the parts  scan data that is obviously caused by reflected Laser.

Had some parts that I tried the 'Clean' Operator to speed things up due to the large quantity of parts and input into surface profile of.030 tolerance.

surface profile were around .021-.022 range.

Now it seams that when I write new programs and don't create a 'CLEAN' Operator in the prg......the Profiles are still resulting in .022 even though the color scheme from the 'POINT COLORMAP' OBVIOUSLY IS SHOWING DIFFERENT COLORS THRU OUT THE PARTS SURFACE.

Do I need to clear it or turn it off or what ever???

The Manual on this Operator really doesn't go into how it's applied in the field so to speak.

Thanks

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  • 0

    You need to be very careful when using the clean operator.  It is designed to remove points over the specified distance from the CAD surface, the intention being that, once properly aligned, you can easily exclude points that may have been gathered on the fixture or on clamps holding the part.  The danger is that you can also exclude valid data if you set the clean tolerance less than the amount of deviation present.  I would say a value of 0.03 is extremely likely to be removing legitimate data because 0.03 is lower than the accuracy spec of the laser - you're looking at about ±0.05 for a laser on a Romer Arm.  Generally, I use a large tolerance for the clean operator at least 1mm more than the amount of variation I expect there to be based on the drawing tolerances.  I then use the select operator to "trim" out any other areas - where clamps are contacting the part for example.

  • 0 in reply to Neil Challinor

    That's good to  know. By the way...the .030 is in inches not mm's.

    I've tried tight tolerance parts with the Laser......Picks up a lot of the stress relief distortions. So i don't use the laser unless I have no other choice with those type parts.

    Thanks

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