Thread Cutting: Lead Angle & Shim Selection - WIDIA Engineering Calculators
Calculate Lead Angle and Shim Selection for LT Threading System.
These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from Kennametal is assumed.
Selection of SHIMs |
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feed direction towards the chuck (standard helix )
To determine catalog number replace (*) asterisk with the number 3 or 4. (3 = 3/8 I.C. or 4 = 1/2 I.C.)
0° to 1° = SMYI*1N1° to 2° = SMYI*2° to 3° = SMYI*1P3° to 4° = SMYI*2P | 0° to 1° = SMYE*1N1° to 2° = SMYE*2° to 3° = SMYE*1P3° to 4° = SMYE*2P | 0° to 1° = SMYE*1N1° to 2° = SMYE*2° to 3° = SMYE*1P3° to 4° = SMYE*2P | 0° to 1° = SMYI*1N1° to 2° = SMYI*2° to 3° = SMYI*1P3° to 4° = SMYI*2P |
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0° to -1° = SMYI*2N-1° to 2° = SMYI*3N | 0° to -1° = SMYE*2N-1° to 2° = SMYE*3N | 0° to -1° = SMYE*2N-1° to 2° = SMYE*3N | 0° to -1° = SMYI*2N-1° to 2° = SMYI*3N |
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