Figure 7-16. - Ironmaster bar-cutting unit.

Table 7-6 shows the number of bars that can be sheared at one time.

The care and maintenance of the Ironmaster portable hydraulic rod bender and shear consist primarily of lubrication and cleaning. There are grease fittings on the machine. Keep these points well lubricated with a good grade of grease, but do not overlubricate, as the surplus grease will collect dirt and rust scale from the rebars. When greasing the shear pin, work the shear arm up and down until grease appears between the arm and the side ears. When using the stirrup bending attachment, keep the center pin clean and well lubricated.

Rust scale from the rebar will accumulate in the holes in the turntable and worktable and in the serrations in the bending cleat and roller slide. Keep these cleaned out, particular] y when changing over to or from the stirrup bending attachment or changing a center pin by means of a solvent-soaked rag or brush. Keep the worktable as clean as possible to minimize the amount of rust scale dropping through to the rack and gear.

PLACING AND TYING REINFORCING STEEL

Before you place reinforcing steel in forms, all form oiling should be completed. Oil on reinforcing bars should be avoided because it reduces the bond between the bars and the concrete. Use a piece of burlap to remove rust, mill scale, grease, mud, or other foreign matter from the bars. A light film of rust or mill scale is not objectionable.

Bars are marked to show where they will fit. You may work according to either one of the two most-used systems for marking bars; however, the system you use should agree with the marking system which appears on the engineering or assembly drawings. The two marking systems used are as follows:

1. All bars in one type of member are given the mark of that member. This system is used for column bars, beam bars, footing bars, and so on.

2. The bars are marked in greater detail. These marks show exactly where the bar is to be placed. In addition to the type member (that is, beam (B), wall (W), column (C), and so on), the marks show the floor on which the bars are to be placed and the size and individual number of each particular bar. Instead of showing the bar size by its diameter measurement, the mark shows the bar size in code by eighths. The examples shown below show the second type of marking system.

2B805 2 = second floor

B = beam member

8 = 8/8- or 1 -inch (2.5 cm)-square bar

05 = part of the second floor plan designated by the number 5

2B0605 2 = second floor

B = beam member

06 = 6/8- or 3/4-inch (1.9 cm)-round bar

05 = part of second floor plan designated by the number 5

Tie wire is used to hold rebar in place to ensure that when concrete is placed the bars do not shift out of position. Sixteen gauge wire is used to tie

Table 7-6. - Multishearing