There is a beam in the ceiling of my garage to support the bathroom above it.
This beam is composed of three 2x12 laminated beams and two 2x12 boards
and spans about 20 feet. This bathroom has a medium size whirlpool
bathtube and I assume this beam is there to deal with the weight of it
full of water. I have attached a hoist to all five boards with
unistrut about 6 foot from one wall.
I have used this hoist to lift machines weighing about 700lbs.

In the very near future I will need to unload a lathe weighing about
1100-1200 lbs. I am wondering if I need to put a temporary post in the
middle of the garage just to be sure it can hold that much weight.

This weight isn't that much more that the weight of water and or some
people in the room.

Opinions?
chuck