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[Gerard Visser <gvisser AT indiana.edu>]

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%2526Tboard_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%2526Tboard_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
> > > > >
> > > > >
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