Abstract
This paper presents the results of a series of tests conducted on a Peerless high-speed, 9-inch-capacity hacksaw. Two types of tests were runs: The first to determine the influence of four typical cutting fluids on the wear of the teeth of tungsten-steel hacksaw blades, the second to determine the influence of eleven cutting fluids on high-speed-steel blades when sawing each of eight different metals.
The time required to saw through a 1½-inch-square section of each metal was obtained and used to indicate the performance of the cutting fluid. In these tests high-speed-steel hacksaw blades were used, inasmuch as they retained the initial degree of sharpness without visible change throughout the test. The comparative tests were run at constant speed and constant feeding pressures.
It is shown that a mineral-lard oil causes the tungsten-steel blades to wear fastest. Plain mineral oil produces the next fastest degree of wear, followed in order by an emulsion and a sulphurized mineral oil. The sulphurized mineral oil permitted the least degree of dulling on the saw blades and, at the same time, kept the sawing time to a time below that for any of the other cutting fluids. Cutting fluids produced a rather wide variation in cutting time when cutting steels, but gave more uniform values when cutting aluminum, malleable cast iron, cast iron, and brass.
