To find out the best way of heating and for how long for each machine can only be found out by experimenting, even different brands of polycarbonate of the same thickness will need heating at different rates. Even if you get the right combination for one pattern, it will not necessarily work with a different pattern.
When it warms you will see the sheet start to sag, and you will have to experiment to find how much sag before you pull will give you the results you want. A useful property of polycarbonate is that if you reheat a failed pull it will attempt to return back to a flat sheet so it gives you something you can use to try again.
As Nick pointed out, the biggest hassle with polycarbonate is drying the sheets out first. If you don't dry the polycarbonate then the forms will have small bubbles all over them.
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