Knurling may also be used as a repair method: because a rolled-in knurled surface has raised areas surrounding the depressed areas, these raised areas can make up for wear on the part. Knurling is also used on the grips of darts[3] and the footpegs of BMX bicycles. Tool handles, mechanical pencils, the grips of pistols, barbell bars, the clamping surface of a motorcycle handlebar and the control knobs on electronic equipment are frequently knurled. By comparison, for cut knurls, the spacing of the cuts is not preset and can be adjusted to allow an integral number of patterns around the workpiece no matter what the diameter of the workpiece. Includes one Medium pitch, 30 Diagonal [BR] knurl to produce a Straight pattern knurl on your part. The outer surface of the metal pin is knurled so that the raised detail "bites" into the plastic irrespective of whether the size of the hole in the plastic closely matches the diameter of the pin.
Every time you add a tooth the diameter increases by a discrete amount. Integrated set screws for easy adjustment of the clearance angle. It is mainly used on small-diameter bolts. Knurling allows hands or fingers to get a better grip on the knurled object than would be provided by the originally smooth metal surface. One or more left-handed rollers used simultaneously with one or more right-handed rollers. Knurls are individually adjustable to insure a perfect tooth form and maximum tool life on any diameter within its capacity. It is possible for a "straight" knurl (not criss-crossed) to be pressed with a single roller, however the material needs to be supported adequately to avoid deformation. Cut knurling often employs automatic feed, the tooling for cut knurling resembles that for rolled knurling with the exception that the knurls have sharp edges and are presented to the work at an angle allowing the sharp edges to cut the work, angled, diamond and straight knurling are all supported by cut knurling.
The terms knurl and knurled are from an earlier knur knot in wood and the diminutive -le, from Middle English knaur or knarre knot in wood; twisted rock; crag. To make your knurling come out properly with no double tracking you need to select the blank diameter of your stock to match the pitch of the knurl. Occasionally, the knurled pattern is a series of straight ridges or a helix of "straight" ridges rather than the more-usual criss-cross pattern. [4][5] The integer number of knurls for any given diameter typically varies by three repetitions from the bottom to the top of the pattern. This descends from Old English cnearra but the vowel in Middle English may have been influenced by Old Norse knrr merchant ship which was known as cnearr in Old English. Leading edge of knurls are in-line with the front of the shank.
Hand knurling tools are available. 
HPBooks, New York, 1996. Monroe, Tom. Knurls are individually adjustable to insure a perfect tooth form and maximum tool life on any diameter within its capacity. As auto parts have become less expensive, knurling has become less prevalent than it once was, and is specifically discouraged by performance engine builders.[2]. The wrong blank diameter can cause the knurl(s) to double track, giving a pattern finer than the knurl was designed to produce, one that's generally unsatisfactory. Learn how and when to remove these template messages, Learn how and when to remove this template message, https://www.doriantool.com/wp-content/uploads/SEC-H-Knurling-Tools_LowRes.pdf, https://en.wikipedia.org/w/index.php?title=Knurling&oldid=1099230593, All articles with bare URLs for citations, Articles with bare URLs for citations from May 2022, Articles with PDF format bare URLs for citations, Wikipedia articles that are too technical from March 2020, Articles needing additional references from March 2020, All articles needing additional references, Articles with multiple maintenance issues, Creative Commons Attribution-ShareAlike License 3.0. There are no in-between diameters that work correctly. This page was last edited on 19 July 2022, at 17:34. Universal CNC shank is reversible to accommodate both Left hand and Right hand applications. Found in many surgical instruments, with use in instrument identification, and the ease of brushing clean. These resemble pipecutters but contain knurling wheels rather than cutting wheels. The same is true of knurls and the blank to be knurled, though fortunately knurls do tolerate a certain amount of error before problems occur. 
For 30 and 45 diamond pattern cut knurling on Automatic and CNC screw machines. Knurling can also be used when a component will be assembled into a low precision component, for example a metal pin into a plastic molding. The knurled nut is another application, having a knurled finish instead of hexagonal or square edges to help in tightening or loosening the nut without the use of a tool. Knurling is a manufacturing process, typically conducted on a lathe, whereby a pattern of straight, angled or crossed lines is rolled into the material.[1]. [6] It is impossible to cut knurling "Like extremely coarse pitch threads" both because lathe gear trains will not support such longitudinal speeds and because reasonable cutting speeds would be impossible to achieve. These are available to form either "male" or "female" patterns, A left-handed straight roller followed by a right-handed straight roller (or vice versa), or. The operation is performed for producing indentations on a part of a workpiece. A criss-cross pattern can be accomplished using any of: Use stock with a circumference that's a multiple of the circular pitch, or stock with a diameter of the circular pitch over . Blank diameter is critical to quality knurling. "Engine Rebuilder's Handbook". The knurled surfaces provide enough grip to hold the nut between the thumb and forefinger. The modern gnarl is a back-formation of gnarled which itself is first attested in Shakespeares works and is apparently a variant of knurled. More common than knurl cutting, knurl rolling is usually accomplished using one or more very hard rollers that contain the reverse of the pattern to be imposed. Page 48. This is very similar to having two gears of the same diametrical pitch that fit together. In the days when labor was cheap and parts expensive, this repair method was feasible on pistons of internal combustion engines, where the skirt of a worn piston was expanded back to the nominal size using a knurling process. An entry level cut type knurling tool for cutting 30 and 45 diamond patterns. Usually, three wheels are carried by the tool: two left-handed wheels and one right-handed wheel or vice versa. Adjustable head for fine-tuning the tooth form. Knurled nuts are typically used in electrical components, musical instruments and in automobiles. Entry level cut type knurling tool for CNC and conventional lathes. A single roller that contains the reverse of the complete desired pattern.