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The backlash of the gears, especially the spindle gear set, is also critical. The ratio between an 1800 mm (70”) diameter blade and the approximate 250 mm (10”) pitch diameter of the spindle gear is about 7/1. Thus, a tooth play of 0.025 mm (.001”) results in a 0.18 mm (.007”) lost motion on the tooth of the blade.
The blade is made of non-rustproof carbon steel, blue-plastered by hand and finely forged from the base to the tip of the knife. The 90 mm (3.5 in) long blade shows patina (dark spots) caused by decades of use. It can easily be sharpened to a shaving sharp edge. Carbon steel is a popular choice for rough-use knives and cheaper options.
The most common blade is the 12 inch or 300 mm length. Hacksaw blades have a hole at each end for mounting them in the saw frame and the 12 inch / 300 mm dimension refers to the center to center distance between these mounting holes. [4] The kerf produced by the blades is somewhat wider than the blade thickness due to the set of the teeth.
Mitre-box saw: a saw with a blade 18–34 in (46–86 cm) long, held in an adjustable frame (the mitre box) for making accurate crosscuts and mitres in a workplace; Sash saw : a backsaw of blade length 14–16 in (36–41 cm).
A chain loop must be of an appropriate length in order to run safely. This is described by the number of drive links. This number is determined by the length and type of bar, the sprocket size and the overall configuration of the saw. For replacement purposes, simply count the drive links on the old chain.
Blade styles with typical edges shown as dark grey. Some of the most common shapes are listed below. S1 A straight back blade, also called standard or normal, has a curving edge and a straight back. A dull back lets the wielder use fingers to concentrate force; it also makes the knife heavy and strong for its size.