[SS2S-Main] Re: temperature controller with arduino

  • From: "Lampe, Mattias SLC CT PEK" <mattias.lampe@xxxxxxxxxxx>
  • To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
  • Date: Wed, 2 Jul 2014 12:11:52 +0800

I think the plastic is usually PA or PBT for computer fans. The melting point 
is closer to 200 degrees, I think.

Not sure if 100c would work since they are mostly plastic, but I do have a 
similar sized metal one that is significantly stronger....uses 110v...
Has anyone considered propane? My uncle out in Indiana makes his own 
roasters...typically trailer deals for a quarter hog or more...The last one he 
made I believe he used the burners from a couple old furnaces...he did manage 
to max out what the tank was able to put out...had to turn off one of the 
burners to get the pressure back up.
Anyways, just a thought though for all I know the stuff is probably flammable

On Jul 1, 2014 6:37 PM, "Lampe, Mattias SLC CT PEK" 
<mattias.lampe@xxxxxxxxxxx<mailto:mattias.lampe@xxxxxxxxxxx>> wrote:

I had not seen that kind of convection cooker before, but it seems like a very 
good idea to me. 1200W seems to be a typical power value, and if that’s not 
enough you could just add a second one.

I’d assume it would still make sense to put one or two additional fans inside 
the oven to move a bit more air.

Is it safe to assume that 100 degrees (or maybe slightly higher) wouldn’t hurt 
a cheap (computer-type) fan?


From: sugarshot-bounce@xxxxxxxxxxxxx<mailto:sugarshot-bounce@xxxxxxxxxxxxx> 
On Behalf Of James Fackert
Sent: Tuesday, July 01, 2014 7:52 PM
Subject: [SS2S-Main] Re: temperature controller with arduino

how about using the lid/heating element/heat stirrer fan from one of those 
convection cookers that looks like a big glass pot? it is all integrated, built 
to take high temps, has temp control to act as safety temp limit and I think 
harbor freight has one on sale for $25.
just need,circular hole in top of oven box.

jim fackert

On Jul 1, 2014 7:23 AM, "Redacted sender 
monsieurboo@xxxxxxx<mailto:monsieurboo@xxxxxxx> for DMARC" 
<dmarc-noreply@xxxxxxxxxxxxx<mailto:dmarc-noreply@xxxxxxxxxxxxx>> wrote:

Hair dryers / heat guns may be underengineered for the expected duty cycle and 
runtime.  I've scratched my head about possible alternatives.  A couple suggest 
themselves as starting points:  1) small resistance-element type room heater.  
2) toaster oven elements.  I think the latter may have already been mentioned 
in a previous post.

(1) can certainly handle the runtime, and probably the duty cycle too.  Could 
it get the oven hot enough?  I suspect it wouldn't be a big problem, but it's a 
question.  Probably best suited to an "outside the oven" type design.

(2) is certainly robust enough to handle the oven environment and get it plenty 
hot, but might result in an oven with difficult "hot spots" -- and putting it 
outside the oven a la convection oven might make for an awkward build.

Is there now some consideration of not recirculating or at least containing the 
heated air?  The "heat budget" probably won't allow for just venting it when 
the fan is running.

Mark L.

-----Original Message-----
From: Lampe, Mattias SLC CT PEK 
To: sugarshot <sugarshot@xxxxxxxxxxxxx<mailto:sugarshot@xxxxxxxxxxxxx>>
Sent: Mon, Jun 30, 2014 10:16 pm
Subject: [SS2S-Main] Re: temperature controller with arduino

Hi all,

regarding SSRs, I have some spare ones I can send to Vicente, if needed.

I don’t have much experience with thermal calculations and designs, but 
regarding the use of hair dryers/heat guns my idea would have been to NOT put 
the entire device into the oven – which indeed would cause some issues with the 
overheat protection and possibly melt some plastic parts of the devices – but 
to just use it to blow hot air through the chamber.

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