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An edge trimmer or lawn edger is a garden tool, either manual or motorised, [1] to form distinct boundaries between a lawn, typically consisting of a grass, or other soft botanical ground cover, and another ground surface feature such as a paved, concreted or asphalted area, or a granular material such as sand or gravel, or simply uncovered soil, for example an unbounded garden.
Best Overall: ECHO PE-225 Handheld Lawn Edger. Best Corded: Worx 12-Amp 7.5-Inch Electric Lawn Edger & Trencher. Most Powerful Cordless: Greenworks Pro 80V 8-Inch Brushless Lawn Edger. Best Walk ...
Slotted angle. Slotted angle (also sometimes referred to as slotted angle iron) is a system of reusable metal strips used to construct shelving, frames, work benches, equipment stands and other structures. The name derives, first, from the use of elongated slots punched into the metal at uniform intervals to enable assembly of structures fixed ...
Lead angle is 90° to the helix angle between the helical tooth face and an equivalent spur tooth face. For the same lead, the lead angle is larger for smaller gear diameters. It is understood to be measured at the standard pitch diameter unless otherwise specified. A spur gear tooth has a lead angle of 90°, and a helix angle of 0°. See ...
The hook (α) angle is a parameter of the material being cut. For steel, it is between 15 and 20° and for cast iron it is between 6 and 8°. The back-off (γ) provides clearance for the teeth so that they don't rub on the workpiece; it is usually between 1 and 3°. [5]
Generally disc size and power increase together. Disc size is usually measured in inches or millimetres. Common disc sizes for angle grinders in the United States include 4, 4.5, 5, 6, 7, 9 and 12 inches, with the most popular sizes being the 4.5 and 5" size. In Europe the most common sizes for angle grinder discs are 115 and 125 millimeters.