Fig 132 Shaping And Sharpening A Grub

formly, it may be checked or held back by holding a wet rag against the place where it is cooling too fast.

42. RESHAPING SPIKE-TOOTH HARROW TEETH

Spike-tooth harrow teeth become worn blunt, as shown at A, Figure 135. They are not made of tool steel, and may be worked at a higher heat than a cherry red. The job of fitting them consists of hammering them out to a point and a shape as suggested at B. The taper should be uniform and the surfaces smooth. They may be somewhat casehardened by plunging them in water when at a cherry-red heat.

43. SHAPING AND TEMPERING A STONE DRILL

1. Shape the hammer end of a stone drill as directed for shaping the hammer end of a cold chisel.

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