I am installing two air cylinders on the knee of my Bridgeport mill to take some of the weight off for my knee motor. I am mounting them on the outside of the knee on each side and they will be in line with the knee lead screw. Each cylinder will have a maximum capacity of about 400 pounds.
The mounting brackets I have at the base of the cylinder are L brackets per the attached picture. I have never looked under a Bridgeport so I don't know how thick the material in that location is. Could be solid or could be hollow with webs in the casting so I don't know if it is O.K. to just bolt these brackets right to the base of the machine or if I need to make a larger steel pad for them to mount to. Lifting the machine and taking a peak under the base is not an option. Any comments?