[Halld-tracking-hw] Plastic Parts

[whitey at jlab.org]

Excellent!

> Gentlemen,
>
> There is no reason this company can't work to a 2 mil tolerance. The 6
> feed
> thrus we had earlier were right in the
> .4365-.437 range. Why wouldn't they be able to do that again? The current
> ones are accurate enough between pieces. not to spec yet, but it appears
> that once they get the mold right, the accuracy will be there.
>
> I would ask them to shoot for the middle of the spec. range; .4365 O.D.
> for
> feed thrus and .610 O.D. for doughnuts and I
> think we will be O.K. If not, we'll have to cross that bridge when we get
> there.
>
> Sorry for the aggravation, Tim, I am just trying to build the best chamber
> possible.
>
> gw
>
> -----Original Message-----
> From: halld-tracking-hw-bounces at jlab.org
> [mailto:halld-tracking-hw-bounces at jlab.org] On Behalf Of Curtis A. Meyer
> Sent: Monday, July 19, 2010 4:51 PM
> To: Tim Whitlatch
> Cc: GlueX Tracking
> Subject: Re: [Halld-tracking-hw] Plastic Parts
>
> Hi Gary -
>
>      I was thinking about oversized and I came to the same thought you
> did.
> I would want to try and have them sanded down (by cheap student labor). We
> have to check them all anyway...  Curtis
>
>     Curtis
> On 7/19/10 4:34 PM, Tim Whitlatch wrote:
>> Hi Curtis,
>>
>> This all sounds correct. One comment. If the feedthru or donut come
>> out slightly large in some areas (.0005 or so), does it make sense to
>> go through another iteration? Should CMU just sand each piece if needed?
>>
>> The delay will be approx. 6-7 weeks for these changes. I am guessing a
>> few thousand dollars for the changes to the mold.
>>
>> Cheers,
>>
>>       Tim
>>
>> Curtis A. Meyer wrote:
>>> Hi Everyone -
>>>
>>>      CMU's understanding of the outcome of today's meeting on the
>>> plastic donuts, feedthrus and pinholders for the CDC are as follows:
>>>
>>> 1)  Increase the OD of the feedthru by 1 mil.
>>>       (This will move it up from just under 0.4355 to just under
>>> 0.4365).
>>>
>>> 2) Increase the size of the hole in the pin holder that holds the
>>> crimp pin
>>>      to as close to what we had in May as possible.
>>>      (This will allow us to seat the crimp pin in the pin holder).
>>>
>>> 3) If it does not generate an additional delay, we will increase the
>>> OD of
>>>      the donut by 1 mil.
>>>      (This will bring it up from under 0.609 to under 0.610)
>>>
>>>     - Curtis, Gary, Naomi and Yves
>>>
>
>
> --
> Prof. Curtis A. Meyer		Department of Physics
> Phone:	(412) 268-2745		Carnegie Mellon University
> Fax:	(412) 681-0648		Pittsburgh PA 15213-3890
> cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/
>
>
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