Why not just get a 1/4" slab of aluminum, throw some thermal expoxy on the
bottom(or thermal paste I suppose) and just drop the plate of aluminum down
on top of the hot plate? You could also embed a thermistor or thermocouple
in the plate to determine temp. This gets you the simplicity of the
hotplate and the uniform thermal distribution you need for a very low cost.
A plate like this can be had at McMaster Carr for <$40, ground to <0.002"
tolerance.
From: Dave N6NZ <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED], gEDA user mailing list <[email protected]>
To: gEDA user mailing list <[email protected]>
Subject: Re: gEDA-user: home made hot plate
Date: Sun, 04 Mar 2007 11:06:28 -0800
Yes, it looks like a good way to go for cheap hot-plate soldering, but they
also say that uneven heating is an issue. My thought with the power
resistors is that you could arrange them such that you got more even heat.
And a prowl of the surplus houses should turn up a hand full of old
fashioned power resistors in the square ceramic cases that would be easy to
epoxy to a sheet of metal, and you should be able to build something for
under $30 with good scrounging. The next time I visit the local surplus
house I plan to look for some resistors.
In the mean time... I just ordered a factory refurbished convection toaster
oven off of Amazon for $60... will let you know how that works out :)
-dave
[EMAIL PROTECTED] wrote:
I think this link has been tossed around before - sorry if it's a repeat.
http://www.sparkfun.com/commerce/present.php?p=Reflow%20Skillet
These guys did a study of the best reflow gizmo and found it to be $30
skillet!
gene
----- Original Message -----
From: Dave N6NZ
Date: Friday, March 2, 2007 1:11 pm
Subject: gEDA-user: home made hot plate
To: gEDA user mailing list
> Seeing DJ's hot plate photo brought to mind a link I once saw,
> where a
> guy built a home-brew SMT hot plate. I can't find the link, but
> as I
> recall, he used a few low-ohm high-watt power resistors epoxied
> to a
> piece of aluminum sheet. He drove it with a 0-30V bench supply
> and
> controlled the temperature manually by varying the voltage.
>
> Seems to me that one should be able to build a pretty good hot
> plate
> that way for not a lot of money. Although I would think that
> copper
> might give more uniform heat spreading than aluminum (at much
> greater
> expense, however, unless you get lucky). And a thermostatic
> temperature
> control shouldn't be hard.
>
> -dave
>
>
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> [email protected]
> http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
>
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