Homebrew PCBs

Thanks Malcom;

Here is a photo album of the mods that I have done on this GBC laminator : http://groups.yahoo.com/group/Homebrew_PCBs/photos/album/2010322437/pic/1318278452/view?picmode=&mode=list&order=ordinal&start=1&count=20&dir=asc

I have also the Gcode available to mill the new epoxy walls (to avoid them to melt with high temperatures...)

JP


--- In Homebrew_PCBs@yahoogroups.com, Malcolm Parker-Lisberg <mparkerlisberg@...> wrote:
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> Very Smart, nice video production too.
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> Malcolm
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> I don't suffer from insanity I enjoy it!
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> --- On Sun, 7/4/10, jp.gleyzes <freedom2000@...> wrote:
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> From: jp.gleyzes <freedom2000@...>
> Subject: [Homebrew_PCBs] Re: GBC laminators
> To: Homebrew_PCBs@yahoogroups.com
> Date: Sunday, July 4, 2010, 8:19 PM
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>       Hi all,
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> This my first message in this forum. I must admit that I have spent hours reading a lot of interesting stuff here before posting AND daring to buy and modify a GBC laminator :-)
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> The results are IMPRESSIVE (at least compared to the traditional "iron" method..
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> The mods I have done are :
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> - hack the CTN by adding a potentiometer to increase its resistance. With that I can reach 190°C
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> - but the laminator started to melt...
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> - so I have also milled new supports for the moteor and the rollers
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> The result is here : http://www.youtube.com/watch?v=UCMnc30hRe8
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> Many Many thanks to all of you and your great ideas
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> Cheers
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> JP
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> Oups I have forgatten to introduce myself :
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> I am from France, 49, and I enjoy sharing informations, I love CNC, electronics, computers... and kites and RC planes ... and much more !
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> --- In Homebrew_PCBs@yahoogroups.com, "sailingto" <sailingtoo@> wrote:
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> > The way I get the temperature of the laminator is with a sensor clamped to the same spot on the aluminum frame as the original thermal switch - I do NOT think this reflects the "true" temp of rollers, but is a close as I can come. 
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> > My first attempt as temperature control was using a type "J" thermocouple clamped in place of the thermal switch, and I would watch the temperature as it heated up to around 400F (I had a Brother printer that required high temp), then run my PCB thru a few times to do the TT.  One day I forgot, and when I came back the temp was up over 500F - maybe close to 600F? (as measured by thermocouple) - and the plastic frame holding the rollers inside had melted.... THAT is when I decided I had to get a "real" temperature controller rigged up.
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> > I have heated to 425F several times in past with no problems.
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> > I took the "spare" I had ordered, and wired in a homebrew temperature controller, using a AD22100 150C Sensor clamped to the aluminum frame in place of original thermal switch.  I wired a solid state relay where the old thermal switch was and control via a PWM signal so as temp approaches setpoint, the heating is slowly dropped so as not to overshoot so much.  With this setup it holds around ±3ºF.  The temp will overshoot a 310F setpoint to about 311 or 312F, then start cooling, heat is applied slowly at 310F, temp will fall to maybe 306/307ºF before starting to rise again.
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> > I've looked at using a PID algorithm to "tighten" up, but it works good anyway.
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> > After melting the first laminator I had, I ordered the 3rd one for a spare, the 3rd is the one that came back as the single heat version. I had hoped it was the same except for being single heat, but looks like it's not?
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> > Still having fun:)
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> > Ken H>
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