To install an overhead crane (Figure CS-29) in one bay of the Strom Manufacturing Company, an assembly plant, brackets for the rails of the crane are to be mounted on eight columns, four on each side of the bay area facing each other. The rails for the crane will span four columns. Each bracket on each column will need six holes in a circular pattern. The holes must be accurately spaced within 5 minutes of arc of each other. The axis of the holes must be parallel and normal to the face of the columns. The center of the bolt-hole circle must be at a height of at least 20 ft from the floor, but the centers of all eight bolt-hole circles must be on the same parallel plane, so that the rails for the crane are level and parallel with each other. Four of the columns along the wall have their faces flush with the wall surface so that mechanical clamping or attachments cannot be used. The building code will permit no welding of anything to these columns.
1. How would you proceed to get the bolt holes located in the right position on the beams?
2. How would you get the hole patterns located properly with respect to each other on all eight beams?
3. List the equipment you will need.
4. Make a sketch of any special tool you recommend.

Horizontal with respect to and in line and in same plane as facing columns About 30 ft Not standard @20 ft Floor not level