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Hi Tim and Slava -<br>
<br>
Thanks for modifying the standoff-bolt. We only needed the base
of the standoff to be 1/2 inch <br>
diameter (about 1/8 inch or so above the teflon washer). Beyond
that, it could be reduced back <br>
down to the original 3/8 inch. <br>
<br>
As for the other 24 standoffs, they do not need to have the
Teflon washers. It was the issue<br>
of trying to minimize the torque to the end plate when tightening
the rods that worried us. This<br>
will not be an issue with the other 24 stand offs. However, if we we
want to make all 36 pieces <br>
the same length, then we could put the washers under all of them.<br>
<br>
Finally, to be complete, it would probably be good at some point
to show the Teflon washer <br>
between the bolt and the end plate. <br>
<br>
Go ahead and get them made -- Curtis, Naomi and Gary<br>
<br>
On 8/10/10 10:36 AM, Tim Whitlatch wrote:
<blockquote cite="mid:4C6163F2.3000104@jlab.org" type="cite"> Hi
Naomi,<br>
<br>
In the current configuration (shown yesterday and originally shown
last
September (
<a moz-do-not-send="true"
href="http://www.jlab.org/%7Evgr/CDC%20Design%202009/CDC%209-18-2009/">http://www.jlab.org/~vgr/CDC%20Design%202009/CDC%209-18-2009/</a>
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.<br>
<br>
Unless you have any objections, we will pursue having 12
stand-offs
made as you requested below.<br>
<br>
A word of caution: All the studs should be torqued evenly in order
to
attempt to compress the thick teflon washers evenly.<br>
<br>
Do you wish to have the teflon washers under all the remaining 24
standoffs?<br>
<br>
Cheers,<br>
<br>
Tim<br>
<br>
Naomi Jarvis wrote:
<blockquote type="cite"
cite="mid284F681B-CBC1-4077-A07C-B3A523DD886C@cmu.edu">
<pre wrap="">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:
</pre>
<blockquote type="cite">
<pre wrap="">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:
<a moz-do-not-send="true" href="http://www.jlab.org/%7Evgr/CDC%20Preliminary%20Drawings/">http://www.jlab.org/~vgr/CDC%20Preliminary%20Drawings/</a>
Agenda is on the wiki
Tim
<whitey.vcf>
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</blockquote>
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<br>
<pre class="moz-signature" cols="72">--
Prof. Curtis A. Meyer Department of Physics
Phone: (412) 268-2745 Carnegie Mellon University
Fax: (412) 681-0648 Pittsburgh PA 15213-3890
<a class="moz-txt-link-abbreviated" href="mailto:cmeyer@ernest.phys.cmu.edu">cmeyer@ernest.phys.cmu.edu</a> <a class="moz-txt-link-freetext" href="http://www.curtismeyer.com/">http://www.curtismeyer.com/</a>
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