Both my grinder and my roaster have gear reduction boxes. Both have motors spinning at 1380 rpm and the grinder is reduced down to 350 rpm while my roaster runs at just 46 rpm. Both gearboxes are stilling running perfectly. As a case in point, the roaster has done a few thousand batches and even with high ambient temps around the gearbox it has never had a hiccup and I expect it to still be running just fine many years down the road as well. They build these things super strong after all.