41
one to two minutes is a very good starting point. Thereafter, “Cooling 2” can be
set for as many minutes as needed, and this parameter will be roughly
proportional with the combined weight of the melt and mold.
Special cooling profiles
Some advanced fusion users like to start cooling the bead with forced air
immediately after pouring, until it starts solidifying; then, they will let the bead
rest in still air for a short while, and complete with another fan cooling step. This is
done to shave off a few minutes from the fusion length, and/or to help stabilize
the glass.
This kind of exotic cooling profile can be achieved via the three sub-steps of the
last cooling step:
The example above represents a “standard” cooling profile, but one could want to
start the fans, then stop, then re-start, with complete control of the power (in
percent) and time for each of the three sub-steps.
Crucible position after pouring
In a typical cooling step, the two crucible-
related parameters are not used to control
the crucible rocking motion, but rather to
control the straightening up of the crucible
holder, after the pouring.
Typically, the tilting angle of “Cooling 1” will
be the same as the pouring (typically 120°), and the tilting angle of “Cooling 2”
will be ninety degrees (90°) to prevent residual drops from sliding on the outside
wall of the crucible, or fall onto the cooling bead. This will give some time for the
flux to pour completely out of the mold during “Cooling 1”, while partially
straightening the crucibles when the blower starts at the beginning of “Cooling 2”.
Note that, if pouring is turned off, then the fluxer is in “non-pouring” mode, and so
will allow for rocking at this step, just like a normal heating step. This is useful to
spread the melt onto the crucible walls when making peroxide or pyrosulfate
fusions.
On-the-fly
editing
During a fusion, it is also possible to edit parameters on the fly, that is, while the
fusion program is running.
To do so, simply edit parameters as explained in the previous paragraphs (from
page 32 onwards).
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