[Halld-tracking-hw] Disussion on CDC assembly

[Curtis A. Meyer]

  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>
>>>      
>>    
>
>
> _______________________________________________
> Halld-tracking-hw mailing list
> 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/


-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/halld-tracking-hw/attachments/20100810/9c73a634/attachment.html