hello forum members, I,m new to this forum and was hoping some one can help me? I work with industrial fans, we use a steel built frame with the shaft & bearings located in an housing called "plumber blocks" that are on top of the steel frame. The blocks are bolted down using 16mm bolts that we use 220 Nm on a torque wrench to tighten down, there are two bolts in each block (4 in total, block either end of shaft) so thats 880 Nm in total. The electric motor is bolted on the steel frame on the side with pulleys and rubber belts, the tension of the belts for say a 30kw motor will be approx 60,000 N. The cosine angle = approx 30 degree's so the tension on the blocks should be approx 51961 N. I have a friendly arguement with my boss saying that the blocks must be pinned (this means inserting a 6mm pin either side of the block tightly to stop movement), he says no, they have never moved once in the 20 years he has built them. My question isn't who is right or wrong, but is there some way of knowing what 880 Nm is compared to the Cosine value of 51961 Newtons?