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By kinema
#11019
From what I've read by Sparky and others hotplate reflowing works great, better then other methods such as toaster oven reflowing. As I see it there are a few issues that need to be tackled to perfect this method.

The issues I speak of are profile control, plate flatness, high voltage interface and wattage requirements. I feel that these obstacles can be overcome but there is a price. Hot plates/skillets from Target may be cheap but if you are planning on reflowing more then a board or two a month why not buy a better plate?

What better plate is there? The Corning PC-600 [1] or one of its smaller siblings [2]. Now a PC-600 is going to run you more the $300 new but you get a quality piece of equipment. This puppy sports a 1000 watt element capable of heating to 1022°F (550°C), its damn flat and has a quite uniform thermal output across the 10"x10" ceramic top.

Another nice feature is the accessory socket for connection to external temperature controller (this is a proprietary interface but I'm sure it can be reverse engineered). This interface would keep all the HV inside a professionally manufactured device that has been designed and built work in hazardous environments (chem labs).

What do you all think? It may be considerably more expensive but I feel that it is much better suited to the task.


--adam

[1] http://catalog2.corning.com/Lifescience ... anguage=EN

[2] http://catalog2.corning.com/Lifescience ... anguage=EN
By geekything
#11027
I used them in a previous life...very good.

I just bought a cheap skillet to play with...am looking forward to it!

-marc
User avatar
By roach
#11030
bah. A glass casserole dish on the stove top works fine for me (just have to make sure to wash it, since I'm not using Pb-free solder).

You kids today, with your fancy hotplates. In MY day, we used a flat rock and a zippo lighter!
By Philba
#11033
I check out thrift store and found a crepe maker that seems to have a pretty uniform temperature distribution. It also has no sides so access to the board is easy.

The biggest problem is thermal profile (uncontrolled heat up, cook down) but I guess I can live with that. For $5, I can't complain.
By geekything
#11045
roach wrote:bah. A glass casserole dish on the stove top works fine for me (just have to make sure to wash it, since I'm not using Pb-free solder).
You better not be making tuna casserole in that afterwards!

-marc
User avatar
By roach
#11054
geekything wrote:You better not be making tuna casserole in that afterwards!
Why not? Tuna has loads of mercury in it anyways. The lead just adds that extra piquancy.
By upand_at_them
#11059
roach wrote:You kids today, with your fancy hotplates. In MY day, we used a flat rock and a zippo lighter!
We didn't have food either; we ate wool coats and we were happy.

Mike
User avatar
By roach
#11060
upand_at_them wrote:[We didn't have food either; we ate wool coats and we were happy.
Luxury! We ate broken glass for dinner. Dad said it "builds character". I tell you, in my day, we got our fiber the hard way, with a brick through a plate-glass window!
By samlittlewood
#11073
I use a cheap hotplate off ebay -~15 quid IIRC.

The thing that makes it work for me is an IR gun style thermometer w/ laser - again ebay for about 30 quid. It is then really very easy to follow a profile - it is actually an advantage that the plate is not at a uniform temperature. I soak the board on the cooler part, and slide it over the element for a few seconds to reflow, and then slide off onto a paint scraper to cool down.

TTFN

SamL
By upand_at_them
#11080
roach wrote:Luxury! We ate broken glass for dinner. Dad said it "builds character". I tell you, in my day, we got our fiber the hard way, with a brick through a plate-glass window!
At least you had a house. We used to live in a corridor.

Mike
User avatar
By roach
#11083
We lived in a lake! And every morning we had to get up and lick the lake clean!
By upand_at_them
#11111
:D
User avatar
By sparky
#11175
Are you guys done yet? :)

To re-iterate: The hot-plate technique is in my opinion MUCH better that the toaster oven trick. We've been reflowing boards for ~1 year now. Same hot-plate actually - no tuna caserole...

The latest push is to go lead-free. The stock hot-plate couldn't get hot enough. We tried upping the input voltage to ~150V with a variable transformer, and it would get hot, but then shut off around 480F. Silly me, I forgot there was a thermostat in the handle of the hot-plate. So forget the variable transformer. We pulled the 5 screws from the power-plug-dial thing on the side of the plate, bent away the mechanical stop on the dial, and wammo, we've got a hot-plate that will ramp up to 500F nicely. Lead-free capable.

-Nathan
By amcfall
#11186
"You were lucky to have a lake! There were a hundred and fifty of us living in a small shoebox in the middle of the road."
By RonnyM
#11209
By the way...Which one's Monty?