12 years ago I tested a HP IIIp, and found 0.005" skew error across a 7X10 test pattern done on an 8.5 X 11 transparency. I also tested a 4, and 5 laser jet and found it to be greated than 0.050" skew error. As far as ink jet, I ran an old HP550, and it was somewhere around 0.050" skew as well. I have no idea of the printers of today, but accuracy is not a concern of the printer people, as it really doesn't matter. Even for single sided, its not an issue, but for small vias,the error's require great attention to detail especially page orinetation, to try and make them line up on a large pcb
Thanks
Ron
----- Original Message -----
From: Dave Mucha
To: Homebrew_PCBs@yahoogroups.com
Sent: Monday, July 14, 2003 11:13 PM
Subject: [Homebrew_PCBs] Re: Help with etching - accuracy
Interesting idea.
but what is the overall accuracy ?
it would seem that a PCB could be off more than just a few thou over
the lenght of a 10 inch board and still be very accuracte for
locating chips and stuff.
Has anyone done realworld tests ?
I would assume that inkjet and laser and copiers would not be perfect
as the US treasury has dictated that such machine cannot be exact 1:1
ratios. goes to preventing the average Joe from making their own $$$$
DAve
--- In Homebrew_PCBs@yahoogroups.com, "TT Scale Model Railroads"
<ttsmr@y...> wrote:
> I need to have a few 8x10 inch pcbs etched.
>
> These are not for electronic applications but a calibration test
> tool. They will have a rectangle out lined with measurment marks
on
> all 4 sides.
>
> I have the art work but need to find someone who can etch them for
me.
>
> Would anyone be available to make several etchings for me and at
what
> cost?
>
> Please feel free to email me at:
>
> ttsmr@y...
>
> Thanks,
>
> DOn
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