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Useful formulas for thread minors Formula for finding the thread minor
This example is in metric (mm/25.4=inch)P = PITCH
65 = 65% OF THREAD
P / 25.4 x 65 / 76.98 - MAJOR = THREAD MINOR EXAMPLE M10 x 1.5 TAP
10mm is the major and 1.5 is the pitch
1.5 / 25.4 x 65 / 76.98 - .3937 = .343 (drill size) Formula for finding
any tap feed and speed
when running in feed per minute (G94) M10 x 1.5 TAP
10 / 25.4 = .3937 tap major
20 SFM x 3.82 / .3937 = S194 1.5 pitch
1.5 / 25.4 = .05905
Now get your RPM's 194
.05905 x 194 = 11.4
M10 x 1.5 tap will run at S194 and F11.4 Formula for finding
any tap feed and speed
when running in feed per revolution(G95) M10 x 1.5 TAP
10 / 25.4 = .3937 tap major
20 SFM x 3.82 / .3937 = S194 1.5 pitch
1.5 / 25.4 = .05905
M10 x 1.5 tap will run at S194 and F.059 |
