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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
Parents
  • If you are scanning then you do need to take 25 hits over at least 3 levels and perform a scnrdv calibration as well (scans once around the equator of the sphere). However, if you only want to take discreet hits and use it like a touch trigger probe then you only need 15 hits, again spread over 3 levels. is correct about the SP25. It takes an initial 5 hits on the sphere an then (from memory) does at least 8 scans in multiple positons & directions around the sphere taking around 2.5 to 3 minutes per tip angle which is considerably slower than the LSPX1 (HP-S-X1) - even if it's taking 25 hits.
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  • If you are scanning then you do need to take 25 hits over at least 3 levels and perform a scnrdv calibration as well (scans once around the equator of the sphere). However, if you only want to take discreet hits and use it like a touch trigger probe then you only need 15 hits, again spread over 3 levels. is correct about the SP25. It takes an initial 5 hits on the sphere an then (from memory) does at least 8 scans in multiple positons & directions around the sphere taking around 2.5 to 3 minutes per tip angle which is considerably slower than the LSPX1 (HP-S-X1) - even if it's taking 25 hits.
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