Standard sprocket size calculation

Time: 2015-8-28 11:01:13 Source: Hebei Ever-Power Sprocket Factory

P: Pitch, R: Roller diameter, N: Number of sprocket teeth ◎Pitch diameter PCD = P/(sin180°/N) ◎Outer diameter OD = P/(0.6+cot180°/N) The table below gives The pitch diameter and outer diameter of a standard pitch sprocket (pitch 1).Example: In order to get the pitch diameter and outer diameter of No. 120 NT (number of teeth) 25 sprocket, the pitch is 7.9789 from the table.Therefore, PCD=38.1×7.9789=303.98847, or take 1 decimal place and round to 303.99.The outer diameter can be found from the table as 8.516.Therefore OD=38.10×8.516=324.4596, or take 1 decimal place and round to 324.Tooth root circle diameter BD=PCD—R Maximum tooth root distance (measured by caliper): CD For odd teeth: CD=PCDcos90/N—R
For even teeth: CD=BD

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