If your spindle motor is dc, mount small capacitors (0.01 uf or so) on the motor terminals. Use 3: one from each terminal to the case of the motor, and one between the terminals. This will reduce a lot of the brush noise.
Since your limit switch is n.c. and goes low to activate an error, there must be a pull down resistor, you could connect the n.o. contacts on the switch to ground and use a pull up resistor (5-10k) on the ckt. This would solve a vibration problem.
robotic regards,
Tom
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