Ballscrew Selection

1 Rotational Speed

The speed of a ballscrew is generally specified in terms of its linear velocity. The rotational speed is calculated using the following equation.
3 wheren = rotational speed rpm.v = linear velocity m/min.p = lead mm. p

2 Critical Speed

The permissible maximum speed for any size and length of ballscrew depends on the diameter of the screw, end fixing and freelength L, and can be taken from the chart below. The chart shows 4 speeds corresponding to the 4 mounting options and includesa safety factor of 25%.It is recommended that the speed does not exceed 3000rpm.n = v x 10 End Fixing End Fixing 1 2 3 4 4 3 2 1 Free Length Lm

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