Star-fst-l mailing list

["Capotosto, Michael" <capotosto AT bnl.gov>]

Gerard, Maowu, Jianing, 

Just another point - we need to be careful to check with whoever we ask to 
fab the board how close to the edge they can route the slots (without the 
edge tearing out). I'm not sure if there's any general rules of thumb, 
Gerard? 

I'm not sure it'd be an issue - perhaps it'd be better to bring the slot 
through the edge of the board, then there's no concern about 
chipping/cracking/breaking such a small piece of substrate. 

--Mike

-----Original Message-----
From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> On Behalf Of Gerard Visser
Sent: Tuesday, August 18, 2020 8:23 AM
To: star-fst-l AT lists.bnl.gov
Subject: Re: [Star-fst-l] T-board redesign

p.s. *If* the T board needs to be made a little bigger in order to accomodate 
the slots where they need to be, that could be OK, right? (Of course we have 
to check for any new conflicts that could pose, but I think it looked 
generally OK in the pictures that Yi sent a couple of weeks ago.)


On 8/18/2020 7:59 AM, Gerard Visser wrote:
> hi Maowu & Jianing,
>      I would strongly suggest that we all review together some 
> documentation of where the slots need to be, and how long they need to 
> be. In other words, what is the relation between the outer hybrid's 
> connector (when it is mounted on mechanical structure) and the four 
> mounting holes on the mechanical strucure?
> [Nominal dimensions, and the tolerance of that location of the connector 
> w.r.t. 
> mechanical structure.]
>      The T board *must* fit to mount down to all accepted detector 
> assemblies, I'm sure we all agree. We need to be sure that there will 
> no longer be any problem with this.
>      Thanks, sincerely,
> 
>          Gerard
> 
> 
> On 8/18/2020 1:55 AM, nie wrote:
>> Hi Gerard and all,
>>
>> Thanks for the comments.
>> The holes -> slots changes are done on our side.
>> The summary slides can be found below:
>> https://drupal.star.bnl.gov/STAR/system/files/20200818_hybrid%2526Tbo
>> ard_redesign.pdf
>>
>>
>> Your comments and suggestions are welcome.
>>
>> Thanks,
>> Maowu & Jianing
>>
>>
>> 在 2020-08-18 12:36，Gerard Visser 写道：
>>> hi Maowu and Jianing,
>>>     This looks indeed fine. I had to find first the datasheet for 
>>> the connector and see there that the fixing nut is 3.2 mm hex, so 
>>> diameter
>>> 3.7 mm. This is indeed clear of all other copper on the T-board 3.1 
>>> gerbers now posted. Looks just fine.
>>>     I'll hold off reviewing the gerbers though until they are 
>>> finished, which awaits the location and tolerance info that you need 
>>> to determine where to put the mounting holes or slots on the T 
>>> board. As Zhenyu remarked in the meeting minutes.
>>>     Thanks, sincerely,
>>>
>>>         Gerard
>>>
>>>
>>> On 8/17/2020 1:53 AM, nie wrote:
>>>> Hi Gerard,
>>>>
>>>> Thanks for the suggestions. We are not quite sure about your first point.
>>>> We tried to add one more slides(slide 8) to show the outline of the 
>>>> connectors, and you can see the connectors and copper are not 
>>>> overlapped with each other.
>>>> The updated version can be found below:
>>>> https://drupal.star.bnl.gov/STAR/system/files/20200817_hybrid%2526T
>>>> board_redesign.pdf
>>>> Hope it helps.
>>>>
>>>> Thanks,
>>>> Maowu & Jianing
>>>>
>>>>
>>>> 在 2020-08-14 21:06，Gerard Visser 写道：
>>>>> Dear Jianing and Maowu,
>>>>>     Having looked so far only at the summary slides -- thanks for those!
>>>>> -- I have a few comments here.
>>>>>
>>>>>     Could you please show (in an auxiliar 'mechanical' gerber 
>>>>> layer) the outline of the mounting hardware (maximum extent of it) 
>>>>> where it touches the board. *Or alternatively* you could say that 
>>>>> you are absolutely sure that the hardware does not overlap any 
>>>>> copper on same side of the board. I can see you made changes in 
>>>>> this that look quite good, but I cannot tell exactly if they're 
>>>>> good enough. [Perhaps this will be clearer if I go look also at the 
>>>>> connector datasheet, I know.
>>>>> But it may be best to show the constraints in your drawing.]
>>>>>
>>>>>     More significantly, I think you have not yet addressed the 
>>>>> issue of mounting location and tolerance of mounting location of 
>>>>> the T-board which is constrained as Zhenyu explained by outer 
>>>>> hybrid connector location. This has to be accomodated somehow in 
>>>>> the mounting holes of the T-board. A change is required, as far I 
>>>>> understand.
>>>>>
>>>>>     We should be informed from Rahul & Felix whether those four 
>>>>> big holes on the left are needed in any way for cable fixing. (I 
>>>>> guess probably
>>>>> not.) I think they should be deleted if they're really not going 
>>>>> to be used.
>>>>>
>>>>>     Thanks, sincerely,
>>>>>
>>>>>         Gerard
>>>>>
>>>>>
>>>>> On 8/14/2020 2:14 AM, nie wrote:
>>>>>> Hi Gerard and all,
>>>>>>
>>>>>> Thanks for the information.
>>>>>> We just finished the new design on T-board & hybrid.
>>>>>> The updated version can be found in the wiki page:
>>>>>> https://wiki.bnl.gov/star/index.php/Hybrid_and_T-board
>>>>>>
>>>>>> I also make a summary slide which covers all the changes:
>>>>>> https://drupal.star.bnl.gov/STAR/system/files/20200814_hybrid%252
>>>>>> 6Tboard_redesign.pdf Comments and suggestions are welcome.
>>>>>>
>>>>>> Thanks,
>>>>>> Maowu&Jianing
>>>>>>
>>>>>>
>>>>>> 在 2020-08-13 10:52，Gerard Visser 写道：
>>>>>>> hi Maowu and Jianing,
>>>>>>>     I think those four big holes don't really serve a purpose -- 
>>>>>>> however I'd also say that we haven't seen all the details of how 
>>>>>>> the cable will be routed and secured along the aluminum mounting 
>>>>>>> ring so maybe it is premature to say these holes don't help.
>>>>>>>     It would be best to delete them if they really don't have a 
>>>>>>> purpose.
>>>>>>>     The jumper can be deleted, the bias lines will not be tied 
>>>>>>> together on T-board nor elsewhere. Let's delete the jumper.
>>>>>>>     The two new 24 AWG ground wire soldering holes, maybe should 
>>>>>>> be in the right half of the board as seen in your picture? Is that 
>>>>>>> feasible?
>>>>>>> I think it may work out a little neater if they are a little bit 
>>>>>>> away from the cable wire holes. But we can consider any good options.
>>>>>>>     Sincerely,
>>>>>>>
>>>>>>>         Gerard
>>>>>>>
>>>>>>>
>>>>>>> p.s. I am reminded from your picture that two of the four 
>>>>>>> existing mounting holes for the T-board are very near an edge. 
>>>>>>> When things are refigured as necessary to allow for the 
>>>>>>> tolerance of position of the outer hybrid's connector, maybe 
>>>>>>> this will be a problem and maybe the size of the T-board has to 
>>>>>>> be increased a little along that edge. I hope that the 
>>>>>>> requirements about the outer hybrid connector w.r.t. the four 
>>>>>>> mount points on the mechanical structure for the T-board can be 
>>>>>>> defined in a drawing soon?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 8/12/2020 10:16 PM, Maowu Nie wrote:
>>>>>>>> Hi all,
>>>>>>>>
>>>>>>>> We are working on the re-design of T-board now. We want to know 
>>>>>>>> if the four holes (red circle) are used or not. if not, Jianing 
>>>>>>>> plan to remove these holes, then we have more space to place 
>>>>>>>> two GND holes as Gerard suggested, and also we can move the 
>>>>>>>> jumper (J1) far away from the purple cable.
>>>>>>>>
>>>>>>>> The four holes are initially designed for fixing the purple 
>>>>>>>> cable, since they are not used, we suggest to replace them as GND 
>>>>>>>> holes.
>>>>>>>>
>>>>>>>> Please correct us if we are wrong.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Maowu & Jianing
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> Star-fst-l mailing list
>>>>>>>> Star-fst-l AT lists.bnl.gov
>>>>>>>> https://lists.bnl.gov/mailman/listinfo/star-fst-l
>>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Star-fst-l mailing list
>>>>>>> Star-fst-l AT lists.bnl.gov
>>>>>>> https://lists.bnl.gov/mailman/listinfo/star-fst-l
>>>>> _______________________________________________
>>>>> Star-fst-l mailing list
>>>>> Star-fst-l AT lists.bnl.gov
>>>>> https://lists.bnl.gov/mailman/listinfo/star-fst-l
>>> _______________________________________________
>>> Star-fst-l mailing list
>>> Star-fst-l AT lists.bnl.gov
>>> https://lists.bnl.gov/mailman/listinfo/star-fst-l
> _______________________________________________
> Star-fst-l mailing list
> Star-fst-l AT lists.bnl.gov
> https://lists.bnl.gov/mailman/listinfo/star-fst-l
_______________________________________________
Star-fst-l mailing list
Star-fst-l AT lists.bnl.gov
https://lists.bnl.gov/mailman/listinfo/star-fst-l