Hi Dick,
Oops, you did say clearly that this was a PCB drawing. I was thinking it was a top view of the base plate. Sorry!
This leaves me with a new question... Is the clear space (126mm x 173.6mm) an absolute number or does this allow for clearance to components/traces on the bottom of the PCB? In other words, do I need to keep electrical conductors back away from these edges (on the bottom of the PCB) to keep from shorting them to the mounting rails?
Chuck
Dick Jansson-rr wrote:
Chuck:
The E05 64 drawing is THE ACTUAL SIZE of the PCB, 140x180mm.
The 0.5mm note just informs the constructor that the nearest structural elements are 0.5mm from the PCB.
There are NO threads on the PCB, the thru clearance holes are as shown 11 each diameter 3.25mm through holes for clearance to the 4-40 mounting screws.
The missing radius (a reason for the review drawing J ) is “2xR3.2mm”
The dimensional difference in the “mounting rail” is just the way things turned out. (I could say that I want good thermal conductance values between the PCB and the Baseplate.) I do note that in certain thermal situations, I reserve the right to add more screws along the edges to insure good thermal conduction to the Baseplate. The 54mm spacing here is pretty wide when we discuss good contact conductance between the PCB and the Baseplate.
-----Original Message----- From: Chuck Green [mailto:[email protected]] Sent: Friday, 19 October, 2007 16.16 To: Dick Jansson-rr Cc: Bob Davis; AMSAT Eagle Subject: Re: [eagle] Review
Hi Dick,
Thank you for the dimensioned drawing. I can design a PCB from this. A few questions...
What is the inside radius of the clear space at the rear?
What is the thread of the mounting holes? Do you intent to use inserts?
The actual PCB size is 139 x 179 mm. No?
Why is the mounting rail a different size at the back than on the sides? I don't really care what it is, just curious.
Chuck
Dick Jansson-rr wrote:
Bob:
Attached is drawing E05 64, 140x180 PCB. This is being sent out for
your review, prior to being posted on Eaglepedia. This PCB gives more
working area with fewer interruptions to the working area (just
essentially two posts). Please look at this and forward any corrective
comments.
’73,
Dick Jansson, KD1K
Via the Eagle mailing list courtesy of AMSAT-NA