Drying blanks before casting or stabilising

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paulloseby

Member
Joined
Jul 3, 2004
Messages
27
Location
Leicester, Not applicable, United Kingdom.
Not yet started casting but all the 'stuff' has arrived. In the Cactus Juice instructions, it says to dry the blanks thoroughly and Curtis leaves his in the oven for 24 hours. Here in the UK power is expensive and I dread to think what it would cost to have the oven on for that long. Does anyone use a microwave with it being quicker (and less expensive) or is there a problem that I am not seeing?

Any advice would be appreciated.

Regards

Paul
 
The oven heats up (itself and the blanks) initially. After that it cycles to maintain the level of heat, which is quite low for "cooking" blanks. So the cost may be much less than you think. I have no hard data to offer, but share your concerns, as Kauai has the highest electric rates in the USA.
 
If you use your oven, toaster oven, or micro wave. The steps will be the same. Weigh your blanks before you start and mark the weight down. Heat your blanks. Must have oven set above boiling point of water but need not be much higher. Here is where the difference starts. With a kitchen oven you are heating and maintaining a large space for a small volume of materials that you are drying. In the toaster oven you have a much smaller area to heat and maintain. This equals less power and less cost. In the micro wave oven you are not using heat to dry, but the moisture in the woods is vaperized by the micro waves and turned to steam, thus generating it's own heat. In the two heated ovens you can put your blanks in for whatever time you choose, remove, and reweigh. When your blanks no longer loose weight they are dry. In the micro wave oven you only have to put your blanks in for about 30 seconds, remove, and reweigh. A micro wave is a much faster and less expensive way to dry blanks. A word of cauction however. Don't use the family's every day micro wave or toaster oven. Go to the thrift store and buy one for cheap. Also just because 30 seconds time in the micro oven seems to be working, don't put your blanks in to much longer per time. They may split, char, smoke, warp, and crack. One could also use a moisture meter to see how dry the wood is. Ideal would be zero, but 6 or 7 would be fine. Jim S
 
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Are you starting with green wood, or kiln dried wood? Pretty sure Curtis' instructions are to get it as bone dry as possible. He's not talking about using an oven to kiln dry the wood from green. You need to use more conventional methods to get it to 6-8% moisture, then use the toaster oven to drop it a little more right before the casting or stabilizing to remove the moisture gained from just sitting around the shop. Getting wood that dry in a microwave is difficult because it can start to burn from the inside out.
 
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