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Date: | Thu, 3 Apr 2014 14:24:52 +0100 |
From: | Richard Bown <richard AT g8jvm DOT com> |
To: | geda-user AT delorie DOT com |
Subject: | Re: [geda-user] printing from PCB |
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On Thu, 3 Apr 2014 07:28:21 -0400 Jason White <whitewaterssoftwareinfo AT gmail DOT com> wrote: > Although I have never seen this before it would seem to be a > transparent ruler with "calibrated" gray scale blocks printed on it. > This would seem to be a way to measure opacity of the masking films > and to make judgments about process variables such as how long should > the PCB be exposed before developing it. If it is used the way i think > it is, ie. lay it down on a sensitized PCB and measure how long it > takes the 8th block to become completely exposed, then it could > actually be quite handy. > > http://www.stouffer.net/TransPage.htm > OK thanks, I can see the use of it when you are doing a regular run of photo etching boards, but when you do one every few months, if that now I'm retired, I find the biggest problem is the precoated photo resist changes with time, it goes off. If it had say some opaque circles on the grey scale it would be useful to see when the board is fully developed. but the biggest headache is developer strength and temperature, when you mix in hot water, too much and it removes the etch resist. I find the feel of it between finger tips one of the best ways to judge the develop time, slippery but not slimey, and not enough to remove your finger prints Good fun :) -- -- Best wishes /73 Richard Bown Email : richard AT g8jvm DOT com HTTP : http://www.g8jvm.com nil carborundum a illegitemis ################################################################################## Ham Call G8JVM . OS Linux Mint 16 x86_64 on a Dell Inspiron N5030 laptop Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W QRV VHF 6mtrs 200W, 4 mtrs 150W, 2mtrs 400W, 70cms 200W Microwave 23 cms 140W, 13 cms 100W, 6 cms 0W & 3cms 5W ##################################################################################
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