[Halld-tracking-hw] Disussion on CDC assembly

[Tim Whitlatch]

Hi Curtis,

We will make the other standoffs .05 longer and not use teflon washers.
Slava will email the drawing we intend to use for the 12 for your review 
before fabrication.

Cheers,

       Tim

Curtis A. Meyer wrote:
> Hi Tim and Slava -
>
>    Thanks for modifying the standoff-bolt. We only needed the base of 
> the standoff to be 1/2 inch
> diameter (about 1/8 inch or so above the teflon washer). Beyond that, 
> it could be reduced back
> down to the original 3/8 inch. 
>
>    As for the other 24 standoffs, they do not need to have the Teflon 
> washers. It was the issue
> of trying to minimize the torque to the end plate when tightening the 
> rods that worried us. This
> will not be an issue with the other 24 stand offs. However, if we we 
> want to make all 36 pieces
> the same length, then we could put the washers under all of them.
>
>    Finally, to be complete, it would probably be good at some point to 
> show the Teflon washer
> between the bolt and the end plate.
>
>   Go ahead and get them made --  Curtis, Naomi and Gary
>
> On 8/10/10 10:36 AM, Tim Whitlatch wrote:
>> Hi Naomi,
>>
>> In the current configuration (shown yesterday and originally shown 
>> last September ( 
>> http://www.jlab.org/~vgr/CDC%20Design%202009/CDC%209-18-2009/ 
>> <http://www.jlab.org/%7Evgr/CDC%20Design%202009/CDC%209-18-2009/> 
>> sketch #2)) there is no room for a .5 inch standoff. However, Slava 
>> has modified the design this morning (see attached sketch) and was 
>> able to make room. It will be tight on assembly though but should work.
>>
>> Unless you have any objections, we will pursue having 12 stand-offs 
>> made as you requested below.
>>
>> A word of caution: All the studs should be torqued evenly in order to 
>> attempt to compress the thick teflon washers evenly.
>>
>> Do you wish to have the teflon washers under all the remaining 24 
>> standoffs?
>>
>> Cheers,
>>
>>        Tim
>>
>> Naomi Jarvis wrote:
>>> Hi Tim,
>>>
>>> We have discussed the spacer stud (stud for tube-spacer drawing D00000-01-02-2016) and would like the following, please:
>>>
>>> diameter of piece going into support rod  to be 0.3125 with tolerance +0 and - 0.001 inches;
>>>
>>> machine the piece starting from 0.5 inch stainless steel (not 0.375") to leave a shoulder at least 0.125 inch thick on the outside of the endplate (so that the teflon washer can be used between the two).
>>>
>>> The teflon washer will be 0.05 inches thick so this might require the length of the rod to be reduced.
>>>
>>> Thankyou,
>>>
>>> Naomi, Curtis and Gary.
>>>
>>>
>>> On Aug 9, 2010, at 10:48 AM, Tim Whitlatch wrote:
>>>
>>>   
>>>> Hi All,
>>>>
>>>> I should have sent a reminder Friday but we scheduled a discussion on CDC assembly for this afternoon (set 2 weeks ago) at 2: 30. We will see you on ESNET. Slava posted drawings etc at:
>>>>
>>>> http://www.jlab.org/~vgr/CDC%20Preliminary%20Drawings/ <http://www.jlab.org/%7Evgr/CDC%20Preliminary%20Drawings/>
>>>>
>>>> Agenda is on the wiki
>>>>
>>>> Tim
>>>> <whitey.vcf>
>>>>     
>>>   
>>
>>
>> _______________________________________________
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>> Halld-tracking-hw at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/halld-tracking-hw
>
>
> -- 
> 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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