[Halld-tracking-hw] Plastic Parts

[wilkin]

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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