[Clas12_rich] CMM for measuring RICH mirrors during week of 6/13/2016

[Marco Mirazita]

Dear Jim,
thank you very much for your availability.
Besides the radius, we would like to survey the contour of the mirrors 
and verify that it is in agreement with our 3D model.
We can provide step files of each mirror.
Since we have a clearance between 2 mirrors of 3 mm, the accuracy of the 
measurements should be something of the order of half mm or so, 
definitely not bigger than 1 mm.
I attached a photo of one of the mirrors.
You will probably need to use some tool to hold the mirrors on the 
machine, since they don't have any support on the back.
Best regards,
Marco



Il 2016-06-08 17:39 James Dahlberg ha scritto:
> Looks like the 16th would be fine. Sounds like you would really like
> for the DSG to perform these measurements.  After everything is set up
> and calibrated, a person could be trained fairly quickly to operate
> the CMM arm and take the measurements.  One of our guys would have to
> calibrate and run the software.  With our ~ 30um CMM, they would be
> measured in one setup.  What accuracy do you need and is it just the
> radius you need or a detailed profile.  Also, just to be sure, the
> surface can be touched with a probe, correct?
> Jim
> 
> On 6/8/2016 8:40 AM, Tyler Lemon wrote:
>> Dear Chris and Jim,
>> 
>> Would the 60 um CMM be available for measuring the RICH mirrors some 
>> time Tuesday June 14 through Friday June 17?
>> 
>> As mentioned in my previous email on 5/25, there would be four, square 
>> spherical-mirror segments with the largest being about 840mm by 530mm 
>> with a radius of curvature of 2.71 meters.
>> 
>> Would the CMM be able to take measurements of the entire mirror 
>> segment without having to be reset? Also, who would perform the 
>> measurements? Could the DSG use the CMM or would Survey Group have to 
>> perform the measurements? Please let us know.
>> 
>> Best regards,
>> Tyler Lemon
>> Detector Support Group
>> 
> 
> 
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