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From: "Erich Heinzle (a1039181 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Thu, 23 Mar 2017 16:05:19 +1030
Message-ID: <CAHUm0tOtsQf7MBOuuRSLX-ZQO6ow75aX7izyrPOfoJd9zHfVMQ@mail.gmail.com>
Subject: Re: [geda-user] handsolder QFN packages
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I have updated the blog page with more photographs, including the
specification badge plate, and weight, which is 2,4kg

http://vk5hse.blogspot.com/2011/05/finishing-off-sdr-cube-transceiver.html

It is apparently 1500W, with a bimetallic switch which I suspect
doesn't kick in during my 250 second runs.

The hot plate itself is 190mm round, and is the black part in the photographs.


On Thu, Mar 23, 2017 at 2:11 PM, John Griessen (john AT ecosensory DOT com)
[via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> On 03/22/2017 04:15 PM, Erich Heinzle (a1039181 AT gmail DOT com) [via
> geda-user AT delorie DOT com] wrote:
>>
>> The key features are a ~3mm thick plate to spread the heat, having the
>> 800W hot plate starting at ambient remain on for 250 seconds, then
>> turned off, then lifting off the board with the jig at about 280
>> seconds, to get a really good fit to the recommended JEDEC heating
>> curve.
>>
>> http://vk5hse.blogspot.com/2011/05/finishing-off-sdr-cube-transceiver.html
>>
>> being able to lift the board without jostling at 280 seconds avoids
>> the problem of thermal inertia of the hot plate continuing to heat the
>> board longer than necessary.
>
>
>
> Thanks, I'm going to try this with my hotplates too.  Not sure which one
> will give the best thermal
> rise-time, so I'll try both.  Do you know your hotplate wattage and mass?
> One of mine is cast iron top,
> one aluminum.

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