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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

  • Why are you so concerned with calibrating tips, instead of the bigger question of whether or not you have a BUSINESS NEED for a more expensive higher accuracy tool?

    You can always change your probe calibration frequency. 

    We calibrate our tips arbitrarily once a month, unless someone breaks a probe or crashes a machine which is super rare (<15/year with 4 machines running 24/7).  If we wanted to, we could study probe accuracy and justify a longer probe calibration interval.  Most organizations and regulatory agencies we operate within allow justified extension of calibration intervals, so stop shooting yourself in the foot over the probe calibration stuff and make a Big Boy decision, Big John :D

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  • Why are you so concerned with calibrating tips, instead of the bigger question of whether or not you have a BUSINESS NEED for a more expensive higher accuracy tool?

    You can always change your probe calibration frequency. 

    We calibrate our tips arbitrarily once a month, unless someone breaks a probe or crashes a machine which is super rare (<15/year with 4 machines running 24/7).  If we wanted to, we could study probe accuracy and justify a longer probe calibration interval.  Most organizations and regulatory agencies we operate within allow justified extension of calibration intervals, so stop shooting yourself in the foot over the probe calibration stuff and make a Big Boy decision, Big John :D

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