On Wed, 19 Sep 2007 23:53:01 -0500, "Maxwell"
wrote:


"Michael Horowitz" wrote in message
.. .
Please see the sketch at http://members.cox.net/mhorowit/cluster/
Using Oxyacetylene, how do I get the base molten without burning the
two pieces that form the 1/8" gap? Are "chill bars" the only choice?
MikeH

Will your situation allow you to increase the gap? Perhaps heating a little
slower and increasing the gap would work for you.
My experience is the outer sleeve will burn back, but I will try with
a cooler flame. - Mike