Industry Secret
about once a week we have to grease the fittings on the roaster and keep all the moving parts lubricated (just like you would grease the fittings on a tractor.) however, unlike a tractor, there is a chance of incidental contact of the grease with a coffee bean. so the hardware store special-orders us cans of grease that are βfood gradeβ and consist of vegetable and mineral oils with no carcinogens or harmful chemicals. it is mostly tasteless and odorless. it fits right into a standard grease gun and works on any machinery lubrication fittings β but technically, you could eat it. mmmmmm