[Halld-tracking-hw] cable strip length

[Curtis A. Meyer]

Hi Fernando -

  the following link shows some pictures of wires hooked up (towards the 
bottom):

http://www.jlab.org/Hall-D/software/wiki/index.php/CDC_Electrical_Hook_Up_Photos

looking at these, it looks more like three wire diameters to get them 
bent unless we can
come up with something else clever (an l-shaped draid holder?)

   curtis
Fernando J. Barbosa wrote:
> Hi Curtis,
>
> Thanks for the reply. It will be hard to find anything for the braid 
> to be less than the length you already have. With a requirement of 
> about 1.2 cm for the soldering and allowing 2 wire diameters for the 
> bending, the required space on both sides of the connector becomes 1.2 
> cm + 5 mm = 1.7 cm. Would 2 wire diameters work? Should Slava consider 
> 2 cm?
>
> Thanks and best regards,
> Fernando
>
>
>
> Curtis A. Meyer wrote:
>> Hi Fernando -
>>
>>     based on your references, we found a reasonably priced tool that
>> can set any length of strip you want. Assuming the following represents
>> the end of the wire:   A is the stripped length of the conducting 
>> core, B
>> is the length of the teflon insulator and C is the stripped length of 
>> the outer
>> braid.
>>
>>                                                      
>> eeeeeeeeeeeeeeeee      teflon
>>                                         bbbbbbbbbbbbbbbbbbbbbb     braid
>>                                eeeeeeeeeeeeeeeeeeeeeeeeeeeeee     teflon
>>                       xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx    conducting core
>>                                 eeeeeeeeeeeeeeeeeeeeeeeeeeeeee    teflon
>>                                          bbbbbbbbbbbbbbbbbbbbbb   braid
>>                                                      
>> eeeeeeeeeeeeeeeeee    teflon
>>
>>                      |-- A--|-- B --|-- C -- |
>>
>> The standard stripper we had set A=B=C=6mm. This is no longer necessary,
>> but we need some feel for what reasonable lengths are. We could 
>> probably solder
>> with A=3mm. The insulation on B probably needs to be of similar 
>> length (3-4mm),
>> and then the question comes to the outer braid.
>>
>> Currently, we are using some crimp on tubes to help solder to the 
>> board. The only
>> length that we are able to find for these is 6mm. If someone knows of 
>> a source of
>> shorter pieces that are not outrageously expensive, that would 
>> control this length.
>> Lacking that, it appears that our current solution would need C=6mm.
>>
>> The above dimensions have a PC board that extends about 1.2 to 1.3 cm 
>> beyond
>> the connector on both sides of the connector. It is also important to 
>> note that the
>> wires themselves extend beyond the board as it takes some space to 
>> bend them
>> through 90 degrees so that they can go through the swiss cheese plate.
>>
>> That all said, I think that there is some hope of shortening C if an 
>> appropriate
>> part can be obtained.
>>
>>   - Curtis
>>
>> Fernando J. Barbosa wrote:
>>> Hello everyone,
>>>
>>> I need to know what is your final spec for the stripping of the 
>>> coax. This is needed before Slava can proceed with the final 
>>> placement of the preamp connectors due to spacing.
>>>
>>> Best regards,
>>> Fernando
>>
>>


-- 
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/