How often do you have your calibration sphere certified? If yearly, Do you know who can certify it for me? I can't ask my support because a year ago they dropped one and tried to glue it back together. That is how important they thought it was. I have a new one now and we usually certify things yearly. I haven't been able or had time to check into it lately. This is my first post so go easy.
Calibration Sphere
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We calibrate our spheres yearly. However, it is important that you check for dents far more regularly. We have a 2nd and 3rd shift and therefore communal cal spheres. Not everybody will fess up that they bumped it... So keep a sharp eye out for your sphericity. I even went as far as to plot it daily. Found that it is very close (the same number) for a "standard" (one you use a lot) set of tips. Even if you have a few tenths variation, start to rotate the sphere first. If it gets better, you may have a bumped sphere. If not, you may have something in your probe system...
It never ceases to amaze me how "repeatable" call sphere sphericity is for the same tip. Doesn't mean it is perfect, but I seem to get always very repeatable numbers.
Jan.***************************
PC-DMIS/NC 2010MR3; 15 December 2010; running on 18 machine tools.
Romer Infinite; PC-DMIS 2010 MR3; 15 December 2010.
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sphere
Its every three years for us. I don't recall who calibrates it. (different dept.)We had one that came with a Merlin and some one had glued the sphere back onto the holder. We took it off and just had it sitting on the top of the holder and had a newby do a tip qual. You should have seen his face when it fell off the holder
sigpicRegards,
Donald Henger
B&S Micro Excel Pfx
3.5mr2 & 3.7mr3
PHH10MQ, TP20 & TP2
Country Rocks,But Bluegrass RULES!!!
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SPHERE CALIBRATION
Thanks for the information. We are very careful when we use the calibration sphere because they are not cheap. I had to answer for when the last one was broken. I have found alot of useful information on this forum. I started working with PCDMIS and CMM work about three years ago now. We have came along way in three years but haven't really scratch the surface with its capabilities. I learn something new everday but I do not have any background prior to starting this job. It is very difficult to figure things out when you do not know all of its capabilities. I have also found that cmm experts are like golfers they all have a differnt swing so to speak.REVERSE, REVERSE, REVERSE
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Originally posted by baylorbearhave also found that cmm experts are like golfers they all have a differnt swing so to speak.
Its all good!sigpic
Screw It. Let's Ride
2011 MR1 Cad ++
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by Mike LarsonJust curious to find out how often a calibration sphere should be sent out for calibration to
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