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An 1/8 inch left-hand drill bit. Left-hand bits are almost always twist bits and are predominantly used in the repetition engineering industry on screw machines or drilling heads. Left-handed drill bits allow a machining operation to continue where either the spindle cannot be reversed or the design of the machine makes it more efficient to run ...
As a travelling salesman for a Philadelphia tool company, the North Brothers of Philadelphia, [2] in eastern Canadian sales territories, [4] [5] he was demonstrating tools one day when his straight-bladed screwdriver slipped and cut his hand due to the straight slot design. [4]
A version with left-hand threads is called an Opsit screw, where unscrewing can be done by turning the screwdriver clockwise, which is the opposite of tri-wing and regular screws. [ 90 ] [ 91 ] The design was adopted by some parts of the aerospace industry, led by Lockheed in the early 1970s on the L-1011 , but met with mixed results due to ...
This is known as a right-handed (RH) thread, because it follows the right-hand grip rule. Threads oriented in the opposite direction are known as left-handed (LH). By common convention, right-handedness is the default handedness for screw threads. Therefore, most threaded parts and fasteners have right-handed threads.
This is particularly useful for small screws, which are otherwise very difficult to attempt to handle. Many screwdriver designs have a handle with a detachable tip (the part of the screwdriver that engages the screw), called bits as with drill bits. This provides a set of one handle and several bits that can drive a variety of screw sizes and ...
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