[Halld-tracking-hw] cable strip length

[Curtis A. Meyer]

Email is a terrible filing system. Could you resend that drawing?
   thanks -- curtis
Fernando J. Barbosa wrote:
> Hi Curtis,
>
> According to Slava, it is not possible to place all the connectors as 
> there is no space for 3 or 2 wire diameters between the connectors.
>
> I was just reminded by Gerard that I sent you a drawing some time ago 
> with the cables soldered to a PCB that fit between the pins on the 
> connector. The cables would be on the same plane as the HVB rather 
> than perpendicular to it. In this manner, you have a lot of space 
> between the connectors and it may be easier for installation. The 
> 0.25" crimp tubes should also work well here.
>
> Best regards,
> Fernando
>
> Curtis A. Meyer wrote:
>> 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/