[Halld-cal] Lightguide measurement length

[Elton Smith]

Thanks, Elton.

Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave STE 16
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax

On 12/18/12 10:21 AM, iñaki wrote:
> Dear Elton,
>
> Regarding your question, How we are taking the measure of length of a 
> lightguide? I would like to explain you the procedure of the 
> dimensional control of the length, and some consideration in the 
> machining process to prevent over size.
>
> 1.- Machining process, the cnc programming of the milling machine is 
> set to 80.08 [mm]. We are only 80 microns over the nominal size 
> because the polishing of mppc face and fiber face need less time 
> (amount of removed material) to be polish. Also, as we use a jig to 
> machining the sixth face (fiber face) the length depend on how much 
> precision the jig and lightguide is mounted. The tolerance of this is 
> (47-8) microns.
>
> 2.- Measurement, after polishig process every light guide is measure 
> with a caliper and it is checked if it is inside tolerance or not. 
> Pieces out of tolerance are sent to reprocess, in some case they are 
> machining again over the length otherwise only must be polish.
>
> Thanks,
> iñaki
>

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