The results are used to set parameters that influence the performance of the
roaster machine horizontal rotating cylinder type to be converted to the form of
equation dimensional analysis. Research carried out by modifying the roaster
machine horizontal rotating cylinder type LPG gas fired to biomass gasification
results gas fired, varying the treatment machine peformance, measure the water
content uniformity, damage to coffee and coffee color levels results of roasting.
Variations that do are variations of coffee with heavy initial weight of each is 2 kg, 3
kg and 4 k