DIY Silicone Heat Blanket

chrismp · Post by **chrismp** » Wed Dec 15, 2010 2:19 am

haha, sure no problem!
but unfortunately we won't have any results until after Christmas since we're both off to the alps tomorrow.
hope you can wait that long

Brazen · Post by **Brazen** » Thu Dec 16, 2010 7:55 am

Has anyone here ever tried a waterbed heater?

endre · Post by **endre** » Thu Dec 16, 2010 8:46 am

I tested what my 4000W heater could actually do yesterday..

turned out it can do a lot..

..of damage

skis well done[/img]

ben_mtl · Post by **ben_mtl** » Thu Dec 16, 2010 10:01 am

How did it happened ? short-circuit ? user error ?
That's impressive ! Are you still gonna try those skis :

Richuk · Post by **Richuk** » Thu Dec 16, 2010 2:55 pm

Mmmmm, crispy!

endre · Post by **endre** » Thu Dec 16, 2010 3:02 pm

the controller stopped working, i have been cleaning workshop all day, still smell terrible. The hose even melted to the cattrack.

vinman · Post by **vinman** » Thu Dec 16, 2010 4:53 pm

wow that could have been much worse, glad everything is ok.

bigdog · Post by **bigdog** » Thu Dec 16, 2010 5:20 pm

Bummer. How many watts could your gear pull.?

I have stayed away from kilowatts for this reason. Overnight a 100-200w will do 80C but takes time.

Brazen · Post by **Brazen** » Thu Dec 16, 2010 7:21 pm

Wow. Sorry Endre, that is a big sack o' suck. Hope you're able to put it back together quickly.

endre · Post by **endre** » Fri Dec 17, 2010 1:32 am

bigdog wrote:Bummer. How many watts could your gear pull.?

I have stayed away from kilowatts for this reason. Overnight a 100-200w will do 80C but takes time.

4kw. I will use less in the future for shure, my first one was 2kw, that was plenty. I wanted to test fast heating. It has worked great til now though, i was able to get the temp. up to 80 in 1 minute.

jvangelder · Post by **jvangelder** » Fri Dec 17, 2010 3:35 am

80C in one min? While that is quick, wouldn't that cause a bunch of uneven heating throughout the mold and press making it press differently?

Richuk · Post by **Richuk** » Fri Dec 17, 2010 4:09 am

Just in case you are looking for a contact, I understand these guys manufacture much of what is used in the UK http://www.holroydcomponents.com/. Not too expensive, compared to Omega and MEI - last time I checked.

endre · Post by **endre** » Fri Dec 17, 2010 4:15 am

jvangelder wrote:80C in one min? While that is quick, wouldn't that cause a bunch of uneven heating throughout the mold and press making it press differently?

Not really. With a lot of power you have a lot of control.. until you loose it. like a nuclear powerplant, it is great til you get a meltdown.

powderho · Post by **powderho** » Fri Dec 17, 2010 3:42 pm

endre wrote:
jvangelder wrote:80C in one min? While that is quick, wouldn't that cause a bunch of uneven heating throughout the mold and press making it press differently?
Not really. With a lot of power you have a lot of control.. until you loose it. like a nuclear powerplant, it is great til you get a meltdown.

I'm sure you've got good reasons for doing this, but at my work (hand lay-up, pre-preg carbon, autoclave cure) we ramp up the cure temp at a rate of 1-8 degrees F/minute. Then we have a dwell time half way to final temp. We definitely don't blast straight to final temp. But on my ski press that's a different story. Straight to final temp.

MontuckyMadman · Post by **MontuckyMadman** » Fri Dec 17, 2010 6:26 pm

OMG!!!
So scary.
We use an external temp prob on the bottom cassette. If we ramped straight to temp the blanket would call for way to much heat, i assume.
We take about 30 min to get to temp and then soak for 1 hour. Bottom heat only.
Maybe we are going excessively slowly but some of the tests we have done 15 min to temp and half an hour soak and the top was not cooked.

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DIY Silicone Heat Blanket