Hello Mike,
I used to use AutoCAD for the fabrication drawing, but always at 1:1.
I guess that you are talking about a small board, and want to scale to
improve clarity.
Another way I have dealt with this is to scale the drawing sheet (a block in
my drawings)
So, for a 2:1 drawing, the board is drawn and dimensioned at 1:1, but placed
on a 1:2 scale drawing sheet.
Your text and arrow sizes need to be set to half scale as well.
Final plot is done at 2:1 so that the drawing sheet becomes the correct
scale.
I hope that this helps you.
(BTW, I no longer produce the fab and assembly drawings this way, as I can
generate the appropriate plots from my PCB design software using various
mechanical layers.)
regards,
Phil.
-----Original Message-----
From: Mike Clemente [mailto:[log in to unmask]]
Sent: Friday, 11 January 2002 10:09
To: [log in to unmask]
Subject: [DC] AutoCad Dimensioning
Hi Everyone,
I am using OrCad Layout for PCB design and create the fabrication drawing in
AutoCad as follows:
1. Run Post Processor to extract Drill Drawing (board outline, hole symbols,
and drill chart) from OrCad Layout, resulting in a DXF file.
2. Open DXF file in AutoCad and add necessary board dimensions @1/1 scale.
3. I then select all and create a Block, and then scale 1.5/1.
The problem is when I explode the block to make any changes, the dimensions
do not remain at the 1/1 scale, but change to whatever I scaled the block
as.
Ex. 1/1 dim=10.000, when exploded, dimension=15.000. What can I do to
prevent this? If I don't create a Block first before scaling, the dimensions
conform to the scaling factor and do not remain 1/1.
Thanks in Advance,
Mike
Mike Clemente, C.I.D.
Sr. PCB Design Specialist
dZinit Applied Technologies
Tel: 847-545-8170
Fax: 847-545-8175
Email: [log in to unmask]
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