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Box blades are a variation of the rear blade which has developed into its own implement, with uses that parallel that of a rear blade, but are distinct. They consist of a heavy metal 3 sided box, with the front, top and bottom open. The front has retractable scarifiers, which can be used to break up hard ground. The rear has a forward and ...
Hammering the teeth against an anvil is also used to remove set from the teeth either for maintenance or fresh setting. Another form uses either a bevel-edged anvil or setting block so that the saw blade rests on a flat portion of the anvil and the tooth held over the bevel, to be struck until bent to the desired angle. Its use is described by ...
Sarah "Tabitha" Babbitt (December 9, 1779 - December 10, 1853) was a Shaker credited as a tool maker and inventor. Inventions attributed to her by the Shakers include the circular saw, the spinning wheel head, and false teeth.
A circular saw blade with many small teeth, designed for cutting plywood with minimal splintering. Dado blade A special type of circular saw blade used for making wide-grooved cuts in wood so that the edge of another piece of wood will fit into the groove to make a joint. Some dado blades can be adjusted to make different-width grooves.
Bottom side of an electric lawn scarifier showing rotating metal blades. Scarification or de-thatching of lawns or turf is a mechanical process whereby the surface and subsurface of the lawn, green or sports pitch is rigorously abraded by penetrating metal blades, tines or prongs.
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.