Useful workshop formulas

Useful workshop formulas

1-Heights above keyways

2-Radii on bolt ends

3-Hexagon: distance across corners

where: F = distance across flats (A/F)
            C = distance across corners
4-Square: distance across corners

5-Helix angles

6-Cutting speeds (inch units)
                                                             N = 12S/𝞹 d

where: N = spindle speed in rev/min
            S= cutting speed in ft/min
            d = cutter or work diameter (in)
            𝞹=  3.142
7-Cutting speeds (metric units)
                                                             N = 1000 S /𝞹 d
where: N=  spindle speed in rev/min
            S = cutting speed in m/min
            d = cutter or work diameter (mm)
            𝞹= 3.142
8-Typical cutting speeds for HSS tools

---- For carbide tipped tools, see manufacturers’ literature.
-----If the calculated spindle speed is not available on the machine gearbox, always use the next lower speed, never use a higher speed.
------ The above are average values when using a coolant. Experience may show that under some circumstances higher or lower speeds may be desirable.

  

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