by mnemonix » Tue Nov 09, 2004 9:39 am
Doing it on time alone is a tough one, there are so many variables - line voltage, ambient temperature, amount of beans in the load, variations between poppers even.
I suppose you need other clues too. Colour is obviously a good one. First crack is usually over when the beans stop expanding in size. How's your sense of smell ? that might be the best way of feeling for 2nd crack, when it's getting 'roasty' and finally, the first hints of smoke are usually some way into 2nd crack.
As a VERY rough guideline, with say 100g of beans, I would expect the whole process to last between 3 and 5 minutes in an unmodified popper, but perhaps you'll just have to start by running a batch from start to 'smoking' to give yourself an idea of the limits.
Make notes when you roast obviously so when you do get it right you can repeat the results, best of luck !
Chris