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Renishaw SP25

Big John
Hello,
At the moment we have a couple of CMM's with Renishaw PH10M heads and either a TP20 or a TP200 module.
We are thinking about buying a new CMM. We are planning to scan some products.
Hexagon recommended their own rotating head type HP-L. This looks quite fancy, except that I have heard that for calibration it needs 25 hits for each angle being used. If that is so, then we will lose plenty of time calibrating instead of measuring. At the moment we calibrate using 5 hits on the calibration sphere. (Minimal I know, but it seems to work for us)
The difference is 5 times longer!!

I have 3 questions:

Is the 25 hits correct?

If we were to buy a Renishaw SP25 how many calibration hits are needed on the sphere? I asked Renishaw, they replied that it is up to the software.

Concerning the HP-L or the SP25

Is it not possible to calibrate the first position with 25 hits, then the other angles scan the sphere?

Regards
John
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  • Hello Ninja Badger and Neil,

    Thank you both for your reactions.
    From your answers I would say that the HP_L was the better choice.

    John
  • in reply to Big John
    Another consideration with the SP-25M, which we use, is that depending on the release version of PC-DMIS you use, the later versions have a tick box option to use partial scan only. That being said, once an initial calibration for a new tip has been completed you can check that box and a calibration will be completed with only 5 touch hits on the sphere. The software stores and remembers the scan data and ties it to the touch hit data during calibration For us, once I upgraded from V4.2 to 2009, I was able to reduce our calibration time from 6.5 hours to 1.5 for our rack of probe tips. Hope this information helps.
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  • in reply to Big John
    Another consideration with the SP-25M, which we use, is that depending on the release version of PC-DMIS you use, the later versions have a tick box option to use partial scan only. That being said, once an initial calibration for a new tip has been completed you can check that box and a calibration will be completed with only 5 touch hits on the sphere. The software stores and remembers the scan data and ties it to the touch hit data during calibration For us, once I upgraded from V4.2 to 2009, I was able to reduce our calibration time from 6.5 hours to 1.5 for our rack of probe tips. Hope this information helps.
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