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Bits also differ by the diameter of their shank, with 1 ⁄ 2-inch, 12 mm, 10 mm, 3 ⁄ 8-inch, 8 mm and 1 ⁄ 4-inch and 6 mm shanks (ordered from thickest to thinnest) being the most common. Half-inch bits cost more but, being stiffer, are less prone to vibration (giving smoother cuts) and are less likely to break than the smaller sizes.
SDS-plus drill bit shank SDS-max drill bit shanks. The diameter of a SDS Plus shank is 10 millimeters. The SDS Max is larger with an 18 mm shank diameter, while the SDS Quick has a smaller 6 mm shank diameter. The SDS shank is simply pushed into the spring-loaded chuck without tightening.
Fractional drill bit set by Craftsman. Fractional-inch drill bit sizes are still in common use in the United States and in any factory (around the globe) that makes inch-sized products for the U.S. market. ANSI B94.11M-1979 sets size standards for jobber-length straight-shank twist drill bits from 1/64 inch through 1 inch in 1/64 inch increments.
For production machine tools, the shank type is usually one of the following: a standard taper (such as Morse or Brown & Sharpe), a straight round shank to be held by a collet, or a straight round shank with a flat for a set screw, to be held by a solid toolholder.
The term shank is generally used interchangeably with the term "cheek" to describe the entire sidepiece of the bit, but shank also may refer just to the lever arm, the portion of the bit that extends from the mouthpiece to the rein ring. The purchase of the bit is the upper portion of the cheek that extends from the mouthpiece to the headstall ...
Coolant may be introduced via holes through the drill shank, which is common when using a gun drill. When cutting aluminum in particular, cutting fluid helps ensure a smooth and accurate hole while preventing the metal from grabbing the drill bit in the process of drilling the hole. When cutting brass, and other soft metals that can grab the ...
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