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, Dick Jansson, KD1K mailto:kd1k@amsat.org kd1k@amsat.org mailto:kd1k@arrl.net kd1k@arrl.net -----Original Message----- From: Chuck Green [mailto:greencl@mindspring.com] 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
kd1k@amsat.org mailto:kd1k@amsat.org
kd1k@arrl.net mailto:kd1k@arrl.net
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