[Halld-tracking-hw] Stand-off sketch ...

[Fernando J. Barbosa]

Hi Curtis,

OK, it sounds good. As long as it is a reliable connection, I am all for it.

Best regards,
Fernando



Curtis A. Meyer wrote:
> Fernando J. Barbosa wrote:
>> Hi Curtis,
>>
>> How do you plan to keep all these parts from rotating once installed?
>
> --    Conducting epoxy.
>>
>> How do you plan to make the GND connections from the connector? 
>> Please provide a sketch with details.
>>
> --  We either design the board with a ground connection at the two 
> screws (preferred method)
>     or we have a very short jumper to the standoff.
>
>> Thanks and best regards,
>> Fernando
>>
>> Curtis A. Meyer wrote:
>>> Attached is a rough sketch showing the proposed stand-off scheme.
>>> 1) A 6/32 blind threaded hole is drilled in the endplate.
>>>
>>> 2) A 6/32 set screw is screwed into the hole. We can use conducting
>>>    epoxy to improve the connection if needed.
>>>
>>> 3) A 1/4 inch electrical standoff with a 6/32 tapped hole is screwed 
>>> onto
>>>    the set screw. There are three possible variations on this for 
>>> the end
>>>    in contact with the endplate.
>>>    i) There is room for the 1/4 inch, nothing specicial
>>>    ii) There is not quite enough room for the 1/4 inch due to the  
>>> heads of
>>>         the feedthrus extending 1/10" above the surface of the plate.
>>>         We can order a standard 1/4 standoff that has a diameter of 
>>> 188 for the
>>>         last .133 inches. This comes from McMaster-Carr.
>>>    iii) Or we can make in house modifications:
>>>          a) we can (in house as needed) taper the end of the standof 
>>> down to ~188
>>>              from 250 so it will fit,
>>>          b) we can (in house) as needed remove some material from 
>>> the head
>>>              of the feed throughs so that the 1/4 in can reach the 
>>> endplate.
>>>
>>> 4) A .156 inch hole is drilled through the lucite plate.
>>>
>>> 5) A 6/32 set screw goes through the lucite plate and screws into 
>>> the standoff.
>>>
>>> 6) Epoxy, or conducting epoxy in placed around the 6/32 set screw.
>>>
>>> 7) A  1/4 inch electrical standoff with blind 6/32 holes is screwed
>>>
>>> 8) The connector is attached to the standoff.
>>>
>>> We also would like to propose the standoffs that hold the HV card be 
>>> on opposite
>>> sides of the card, rather than both on the same side. This gives 
>>> less chance that the
>>> card will tilt during installation and removal.
>>>
>>> @===  High-voltage board
>>> O          Standoff/set screw of installation/removal.
>>>
>>>                                   O
>>>                                @=============================@
>>>                                                                                                   
>>> O
>>>
>>> Curtis, Gary and Yves
>>>
>>> ------------------------------------------------------------------------ 
>>>
>>>
>>> _______________________________________________
>>> Halld-tracking-hw mailing list
>>> Halld-tracking-hw at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/halld-tracking-hw
>
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: barbosa.vcf
Type: text/x-vcard
Size: 188 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/halld-tracking-hw/attachments/20090930/68ddf5a8/attachment.vcf