Chuck:
These are all quite valid suggestions. On PCB mounting,
the center supports will still be needed for the keeping of the self-resonance
of the PCB up above the 200Hz area. These suggestions will be given
consideration.
For Juan, using socket head cap screws certainly can be
done, but I suspect that you are trying to use a very well worn Phillips screw
driver. The ONLY Phillips screw driver has to be one with a hardened tip, such
as those that are used with a magnetic hex driver tool. With these 4-40 screws
if there is any wear in the Phillips recess that screw is waste basket
material, and properly used you just cannot have enough torque to pop the tool
without shearing off the screw head. This also tells me that your torquing of
the screws has been unnecessarily high causing the standoff posts to lose their
grip.
'73,
-----Original Message-----
From: Chuck Green [mailto:[email protected]]
Sent: Tuesday, 16 October, 2007 22.22
To: Dick Jansson-rr
Cc: Bob Davis; AMSAT Eagle
Subject: Re: [eagle] 125x180 Module Assembly
Hi Dick,
It looks like you intend the PCB to go over the lip of
the front of the
base plate and screw to it. Any chance of doing the same
on the sides?
Might you put threaded holes along the sides for that
purpose? The PCB
would be more securely held along those sides and, more
important to
some applications, there would be better thermal
conductivity from that
part of the PCB to the frame of the box. You might also
be able to
eliminate some of the stand-off's which would allow more
of the PCB for
components.
Another thought, which might not be compatible with the
first thought...
I see that the box lid has "ears" that come
down over the front
(connector) plate and a screw through each of them. Any
chance of
reversing that and having the ears on the front plate
with a screw
through the cover from the side? That would help with space
for
connectors on the front plate a little.
Looking good!
Chuck
Dick Jansson-rr wrote:
>
> Bob:
>
> Attached are three pdf views of the proposed revised
Eagle module, and
> open view, fully closed view, and a view w/o the
PCB. It has been a
> lengthy day getting all of the darned 0.5mm cover
bends correct and
> holes properly placed for full mating of the cover
with the baseplate
> (such things as 0.581mm hole placement discrepancies
– ugh!). If built
> from the drawings that can be made from these
objects, there should be
> a good fit in the real hardware.
>
> I do not presume as to what the “real”
next step wants to be, as I do
> not propose to make the 2D drawings until the
discussions have settled
> down to agree that this is what we collectively
like, or at least
> collectively accept. Please advise.
>
> ’73,
>
> Dick Jansson, KD1K
>
> [email protected] <mailto:[email protected]>
>
> [email protected] <mailto:[email protected]>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Via the Eagle mailing list courtesy of AMSAT-NA
> http://amsat.org/mailman/listinfo/eagle
>