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Touch probing vs Scan probing

We are upgrading our CMM and would like some feedback on the 

pros/cons of going from touch probe to scan. All feedback is welcome!

Thank you in advance...

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  • There is several small and major differences between the two. I believe the analog heads are superior in almost every way, especially for doing basic touch probing:

    Your prehit and retract can now be as small as .025 and maintain consistent and accurate data (for TTP minimum recommended is .06)

    You can take a hit by travelling in the Z+ direction

    Incorporating multiple tips in a routing is easier and faster, as well as incorporating a probe tip changer.

    Hits taken when probing are slightly more accurate than a typical TP20, because instead of taking a hit when the probe makes contact with the part, the probe hits the part, reaches its upper force limit, and then records a few hits while pulling away from the part surface, recording the best one.

    Analog probes are not sensitive to magnetism. TP20 modules can easily be rendered useless by a powerful magnet.

    In terms of actually scanning, I recommend you use it only when you deem it necessary.

    It's super helpful when reporting a the profile of a line or surface, as well as the shape of a hole or generally finding error in the shape of anything.

    However: It will wear tips more aggressively than traditional touch probing. Scanning aluminum with a ruby tip is NOT recommended as it will rapidly degrade the ruby tip. If you are scanning aluminum use a silicon nitride tip.

    edit: spelling

  • Great summary

    We only have Analog Probes here and I would always recommend them over TouchTrigger Probes.
    But one thing to keep in mind is that TouchTrigger Probes take singular hits (not scanning) a lot faster than Analog Probes.

  • Yes, although there is a "fast probing" option that can be toggled on for analog probes that makes them the same speed. It just sacrifices the accuracy you gain by taking hits the same way a touch trigger probe would.

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