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A pneumatic die grinder with a right-angle head. A cordless battery-powered rotary tool used for light tasks. A die grinder or rotary tool is a handheld power tool and multitool used for grinding, sanding, honing, polishing, or machining material (typically metal, but also plastic or wood).
Milling evolved from rotary filing, so there is a continuum of development between the earliest milling cutters known, such as that of Jacques de Vaucanson from about the 1760s or 1770s, [3] [4] through the cutters of the milling pioneers of the 1810s through 1850s (Whitney, North, Johnson, Nasmyth, and others), [5] to the cutters developed by ...
Land-grant laws similar to the Homestead Acts had been proposed by northern Republicans prior to Civil War but they had been repeatedly blocked in Congress by Democrats who wanted western lands open for purchase by slave owners. The Homestead Act of 1860 passed in Congress but was vetoed by President James Buchanan, a Democrat.
Hobbing is a machining process for gear cutting, cutting splines, and cutting sprockets using a hobbing machine, a specialized milling machine.The teeth or splines of the gear are progressively cut into the material (such as a flat, cylindrical piece of metal or thermoset plastic) by a series of cuts made by a cutting tool called a hob.
While a cutter or spreader tool is designed for a particular application, a combination tool (also known as a combi-tool or spreader-cutter) combines cutting and spreading functions into a single tool. In operation, the tips of the spreader-cutter's blades are wedged into a seam or gap—for example, around a vehicle door—and the device engaged.
Tributes are pouring in for former President Jimmy Carter, who died Sunday at the age of 100.His life and legacy will be celebrated in Washington, D.C., Atlanta and in Carter’s hometown of ...