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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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  • Yes 25 is correct.

    The SP25 takes less hits, but then does a series of scans around and over the sphere, which takes much longer than the Hexagon offering.


    Obviously what you loose in calibration you would typically make up more than in use, scanning diameters and surfaces rather than taking touch hits.
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  • Yes 25 is correct.

    The SP25 takes less hits, but then does a series of scans around and over the sphere, which takes much longer than the Hexagon offering.


    Obviously what you loose in calibration you would typically make up more than in use, scanning diameters and surfaces rather than taking touch hits.
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