Smonson's poorly-thought-out toaster oven reflow experiments

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DrF
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Re: Smonson's poorly-thought-out toaster oven reflow experiments

Post by DrF » Tue Aug 18, 2020 10:45 am

Smonson wrote:
Mon Aug 17, 2020 1:47 pm
DrF wrote:
Mon Aug 17, 2020 1:40 pm
What about getting one of those controller kits?
They were quite the fashion a few years ago, I suspect they have come down loads now with the masses of cheap micro controllers all over the place.
To control the oven? I'm expecting it to be a lot quicker and cheaper to scratch-build it. Plus, I don't know what kind of display I need to mount on the front yet. It depends on what will fit into the space.
Just a idea, I don't know how tight the tolerance for over temperature or under the parts could take, from when I looked into this before there was ramp up times, time profiles for different stuff/size of boards etc. lots of pretty graphs :lol: so im guessing its a bit more complex than turn the timer on for 10 mins and hope?

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Re: Smonson's poorly-thought-out toaster oven reflow experiments

Post by Smonson » Tue Aug 18, 2020 12:29 pm

Yup - it would take a few days to get the software up and running, but that's all part of the fun!

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Re: Smonson's poorly-thought-out toaster oven reflow experiments

Post by Smonson » Mon Apr 05, 2021 9:08 am

I've got this all together now, hardware-wise.

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There is a fly in the ointment however. After some initial testing it seems that the heat from the heating elements takes about 120 seconds to be fully picked up by the thermocouple. I assume that this is because the large thermal mass of the big metal probe that it's encased in. Probably made for taking temperatures anally or something.

It's a bit useless for negative feedback on the heating element with a delay like that since the entire soldering operation is only supposed to take 240s - I might need to look for a different one that can heat up quicker before I can use this thing without setting all my boards on fire.

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