Knurls and Knurling KNURLS AND KNURLING Machinery's Handbook, 31st Edition
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Standard Knurls and Knurling.— The ANSI/ASME Standard B94.6-1984 (R2014) cov ers knurling tools with standardized diametral pitches and their dimensional relations with respect to the work in the production of straight, diagonal, and diamond knurling on cylindrical surfaces having teeth of uniform pitch parallel to the cylinder axis or at a helix angle not exceeding 45 degrees with the work axis. These knurling tools and the recommendations for their use are equally applicable to general purpose and precision knurling. The advantage of this ANSI/ASME Standard system is the provision by which good tracking (the ability of teeth to mesh as the tool penetrates the work blank in successive revolutions) is obtained by tools designed on the basis of diametral pitch instead of TPI (teeth per inch) when used with work blank diameters that are multiples of 1 ⁄ 64 inch for 64 and 128 diametral pitch or 1 ⁄ 32 inch for 96 and 160 diametral pitch. The use of knurls and work blank diameters that will permit good tracking should improve the uniformity and appearance of knurling, eliminate costly trial and error methods, reduce the failure of knurling tools and the production of defective work, and decrease the number of tools required. Preferred sizes for cylindrical knurls are given in Table 1, and detailed specifications appear in Table 2. Table 1. ANSI Standard Preferred Sizes for Cylindrical Type Knurls ANSI/ASME B94.6-1984 (R2014) Nominal Outside Diameter D nt Width of Face F Diameter of Hole A Standard Diametral Pitches, P 64 96 128 160 Number of Teeth, N t , for Standard Pitches 1 ⁄ 2 3 ⁄ 16 3 ⁄ 16 32 48 64 80 5 ⁄ 8 1 ⁄ 4 1 ⁄ 4 40 60 80 100 3 ⁄ 4 3 ⁄ 8 1 ⁄ 4 48 72 96 120 7 ⁄ 8 3 ⁄ 8 1 ⁄ 4 56 84 112 140 Additional Sizes for Bench and Engine Lathe Tool Holders 5 ⁄ 8 5 ⁄ 16 7 ⁄ 32 40 60 80 100 3 ⁄ 4 5 ⁄ 8 1 ⁄ 4 48 72 96 120 1 3 ⁄ 8 5 ⁄ 16 64 96 128 160 The 96 diametral pitch knurl should be given preference in the interest of tool simplification. Dimensions D nt , F , and A are in inches.
Table 2. ANSI Standard Specifications for Cylindrical Knurls with Straight or Diagonal Teeth ANSI/ASME B94.6-1984 (R2014)
Tooth Depth, h , + 0.0015, - 0.0000
Nominal Diameter, D nt
Diame tral Pitch P
Tracking Correction Factor Q 0.0006676 0.0002618 0.0001374
Radius at Root R 0.0070 0.0050 0.0060 0.0040 0.0045 0.0030 0.0040 0.0025
1
5 ⁄ 8
3 ⁄ 4
7 ⁄ 8
1 ⁄ 2
Major Diameter of Knurl, D ot , +0.0000, - 0.0015
Straight
Diagonal
64 0.4932 0.6165 0.7398 0.8631 0.9864 96 0.4960 0.6200 0.7440 0.8680 0.9920 128 0.4972 0.6215 0.7458 0.8701 0.9944
0.024 0.016 0.012 0.009
0.021 0.014 0.010 0.008
160 0.4976 0.6220 0.7464 0.8708 0.9952 0.00009425
All dimensions except diametral pitch are in inches. Approximate angle of space between sides of adjacent teeth for both straight and diagonal teeth is 80 degrees. The permissible eccentricity of teeth for all knurls is 0.002 inch maximum (total indicator reading). Number of teeth in a knurl equals diametral pitch multiplied by nominal diameter. Diagonal teeth have 30-degree helix angle, y .
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