RE: Printed Circuit Board Supplies

Hans,

I have been thinking about how to build a laminator on the cheap and the
line I am pursuing is to get the fuser unit from a laser printer or copier
and use that. All the fuser units I am familiar with have a halogen bulb
inside the heated roller to heat it up and then have thermistors external to
the roller to control the temperature. I plan to use a PIC microcontroller
to read the thermistor and switch the line voltage to the heater lamp on and
off via a solid state relay. Then the only thing left is driving the roller.
Many of the fusers even have an adjustment on the non-heated roller to
control the pressure.

I have a request in to our printer tech to save me the next fuser he
replaces that still heats and has a roller that is in fair shape.


Tim
[Denver, CO]

timg@... <mailto:timg@...>
http://www.ktmarketing.com

> -----Original Message-----
> From: hansw [mailto:hansw@...]
> Sent: Wednesday, February 09, 2000 9:38 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO]Printed Circuit Board Supplies
>
>
> From: hansw <hansw@...>
>
> Ted,
> A question comes to mind. As you have a laminator to look at, how
> difficult do you think it would be to make one ?
>
> Then there is the question of cost of dry film. What are the
> minimum these (whoever you use ) will sell for in $... how much
> film would that be ?
>
> What's the shelf life of the film ? this would be important for me...
>
> One thing I like about positive pre sensitized boards, I simply
> use Red Devil Lye as a developer and it's fast. Exposure for 1
> minute under my UV light source and develop in Lye for about
> 30-45 seconds... I make transparencies on my LaserJet, I'm also
> able to consistently get very fine lines <10 mill is not problem,
> anything seems pointless for my kind of work.
>
> Hans Wedemeyer
>