Y3150 gear hobbing machine control circuit

It consists of three links: forward and reverse point uniformity, one-way start and limit device
. In the figure, SQ1 is the limit switch . Once it touches
1=, the machine tool will stop running. At this time, you need to use a manipulator
to shake the hob head until the limit switch and the impact block are separated from
your hand before it can work again. SQ2 is the end point switch .
After the two pieces are processed, the machine tool automatically stops. The electrical components of
  the control circuit are shown in Table 5-2.