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Gears

In a CNC feed...

Question

In a CNC feed drive, a stepper motor with step angle of 1.8 degree drives a lead screw with pitch of 2 mm. The basic length unit (BLU) for this drive is

A

100 microns

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B

10 microns

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C

40 microns

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D

20 microns

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Solution

The correct option is B 10 microns
Pitch=2 mm
Step angle $= {1.8}^{\circ} / p u l s e$
Distance travelled in one rev $(360^{\circ}) = 2 m m$
No.of pulses in $360^{\circ} = \frac{360}{1.8} = 200$ pulses
Distance travelled in one pulse $= \frac{2}{200} m m$
$= 0.1 m m \approx 10 μ m$

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