Question

For a 3-axes CNC table. the slide along the vertical axis of the table driven by a DC servo motor via lead screw nut mechanism. The lead screw has pitch of 5 mm. This lead screw is fitted with a relative (incremental) circular encoder. The basic length unit (BLU) of the slide along the vertical axis of the table is 0.005 mm. When the table moves along the vertical axis by 9 mm. The corresponding number of pulses generated by the encoder is

• A. 9000
• B. 1400
• C. 1800
• D. 4200

Answer 1

The correct option is C 1800

$P=5mm$
BLU= 0.005 mm
Now
1. $Rev.\to x\times BLU$
$x=1000pules/Rev$
Now, $y=9mm$
So $n=\frac{y}{p}rev$
or number of pulse
$=\frac{y}{p}\times x=\frac{9}{5}\times 1000$
No. of pulese=1800