[Halld-tracking-hw] straw lengths

[Tim Whitlatch]

Hi Gary,

These numbers make sense. We will update the drawings to reflect this.

Thanks,

       Tim

gw wrote:
> Gentlemen,
>
>     I measured the actual lengths this am with a Starrett precision 
> rule graduated in .020" increments.
>
> cut lengths;
>
> straight   58.980"
> stereo    59.240"
> stereo + 59.280"  (these are for stereo interlocking rows 6 and 8)
>
>
> finished lengths;
>
> straight   59.040"
> stereo    59.290"
> stereo + 59.335"  (row 6 and 8)
>
> We will adjust further stereo interlocking rows as we go.
>
> For the most part, we are getting a tighter fit than we originally 
> planned for.
>
> Slight discrepancies due to fitment of donuts and straightness of cuts 
> are to be expected.
>
> gw
>
> On 12/15/2010 10:47 AM, Curtis A. Meyer wrote:
>> Hi Tim
>>
>>     we did not directly measure the lengths of the straws. We have been
>> fitting them to be as long
>> as possible and still be able to get them in and then back calculating
>> from the 150 length. The stereo
>> are tricky this way as it is nearly opposite corners that matter. We are
>> just going to measure the
>> lengths this morning with the most accurate straight edge we have and
>> that will be "it"!
>>
>>      With regard to the gas nipple that Slava wants to have made. We 
>> were
>> looking at the
>> drawings carefully and the thin parts of the nipple are only 20mil
>> thick. To make sure that
>> they are not broken when clamping the tube onto the nipple, we think
>> that they must be
>> made of of stainless.
>>
>>     curtis
>> On 12/15/10 9:18 AM, Tim Whitlatch wrote:
>>> Hi Curtis,
>>>
>>> I do not understand the stereo straw length changes. Previously in
>>> your preliminary procedures you had a cut stereo straw length of
>>> 59.280. Slava suggested 59.245 so the straws would fit everywhere with
>>> about a 1mm gap (plus effect from variation in angle).
>>> The numbers below are about 4mm shorter than you previously said you
>>> would use. Are these numbers below correct? Please verify.
>>>
>>> Thanks,
>>>
>>>        Tim
>>>
>>> Curtis A. Meyer wrote:
>>>> Hi Everyone -
>>>>
>>>>     just to summarize on straw lengths:
>>>>
>>>>      straight straws:  58.975 incehs
>>>>      normal stereo straws:  59.130 inches
>>>>      interlocking stereo straws:  59.170 inches
>>>>
>>>>      - Curtis
>>>>
>>
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