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Protecting One's Assets
chipenter:
--- Quote from: vtsteam on December 06, 2014, 10:43:29 AM ---I don't know Andrew, but sub freezing sand would be unpleasant. Warm properly tempered greensand is a pleasure to work with. For small or thin parts, chill is also a factor in filling the mold well.
I'm thinking of something , low wattage, with, say, a 24 hour timer that I could turn on the night before molding. But you'd want it to be safe enough to trust unattended.
I've got an old unused portable cooler/ice chest that I could store the sand in. It would only take minimal wattage to warm it up overnight. But what to use?
--- End quote ---
Trace heating cable is designed for to keep pipes frost free 30 watts a metre .
vtsteam:
Jeff I actually use that stuff on pipes, but the instructions I've seen warn not to cover it with anything and keep away from constant mosture.
The aquarium stuff is meant for installation under sand soil and in water.
awemawson:
You can get a similar wire / tape for horticultural purposes that's intended for direct burying in soil, which obviously potentially gets wet and is covered.
http://www.simplycontrol.co.uk/shop/soil_warming/2_39_0_0/default.aspx
Jonny:
Is it really protecting ones assets when its probably cheaper to write off the lathe every 4 months when using 30W forms of heating.
http://www.sust-it.net/energy-calculator.php Tap in 30W comes up 46p/hr usage then times that by 24 that's £11 cost a day! How many weeks call it 20, see where im going.
awemawson:
Hang on the maths is wrong there :bugeye:
I pay 14 pence per kW/Hr now 30 watts is 0.030 kW/h or 0.42 pence per hour. I think you are confusing watts and kilowatts
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