Re: ATM Melting pitch

[Michael Lindner <mikell@optonline.net>]

Thanks, Matt, for a nice overview. I have a couple of points to add...

On Monday 19 January 2004 02:26 pm, mlbrown@everstrive.com wrote:
> 1. Put pitch in its paper cardboard container inside a paper bag.
>
> 2. Beat it with a hammer to get it down to 1/2 inch chunks or so.

I use two layers of plastic garbage bag, and a soft rubber mallet. 
Occasionally the container will burst open,a nd little pieces of pitch will 
be everywhere if the bag breaks.

> 6. Generally I find the pitch is fine as is.  If so, you're in luck.  Wrap
> tape dam (I use masking tape) around the tool, and pour the chunks of pitch
> and dust on top.  You want a layer between 3/16" and 3/8" deep.  Place it
> on top of an old cookie sheet in the oven.  Set heat to 200 deg F. Watch
> carefully -- it will melt in about 10 minutes. 

I heat mine over a hot plate, not in the oven. This idea sounds good, but I 
would add cautions about the following:

1. Put the tool on top of a non-stick sheet pan with a lip on it - I *have* 
had masking tape suddenly give way during a pitch pour (which I do on top of 
newspaper), and if you get pitch on the inside of your oven you will be 
shopping for a new oven.

2. Pitch fumes are flammable. I would not try it with a gas oven (or at least 
I would leave the door open partway). Caveat Meltor!

3. Start the melting in a *cold* or at least *cool* oven. If you put a cold 
(dental stone or plate glass) tool on a hot surface, there's a danger of 
cracking it.

Clear skies.
-- 
Michael Lindner
http://www.starastronomy.org *** http://home.att.net/~mikel
http://www.atmsite.org *** http://www.atmlist.net