Picture credit: Emma Lee
An "It has always worked for me before" schedule implies a single approach to slumping regardless of differing conditions.
In the example shown, we are not told the rate up to the slump. But is clear the rate was too fast for the glass layup. It cracked on the way up. This tells that the rate was only a little too fast. If it had been faster the glass would have separated further apart. The heat was enough to appear to recombine at the edges where it was not slumping so much.
Review your "go to" schedules for each firing. It may still be a good base from which to work. But you need to assess the layup, thickness, and any other variations to help adjust the schedule to fire each piece.
Some of the variations from the “standard” to be considered are:
A really useful reminder. Thanks Steve.
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