CNC Spindle Speed Control Bundle The CNC Spindle Speed Control Bundle is built for CNC users who want to control spindle speed and switch an accessory circuit from their CNC control system. This bundle pairs the C41S-PWM Spindle Speed Control Board with the C37 Single Relay Board, giving you a practical setup for VFD spindle control, spindle enable wiring, coolant control, contactor triggering, or other CNC accessory switching. This is a cleaner option than buying parts separately and trying to figure out later what else is needed. The C41S-PWM handles the spindle speed signal, while the C37 gives you a dedicated relay output for switching one compatible AC or DC device. Best for: CNC routers, CNC mills, VFD spindle setups, spindle enable circuits, coolant pump control, contactor triggering, and CNC control box upgrades. What’s Included C41S-PWM Spindle Speed Control Board Converts a PWM signal into a 0–10V analog output for compatible VFD and spindle speed control. View full C41S-PWM specs C37 Single Relay Board Provides one relay output for switching a spindle enable circuit, coolant pump, contactor, valve, or other compatible CNC accessory. View full C37 relay board specs Why Buy This Bundle? Control spindle speed from your CNC system: The C41S-PWM outputs the 0–10V analog signal used by many compatible VFDs for external spindle speed control. Add a dedicated relay output: The C37 gives you one relay-controlled output for spindle enable, coolant, contactor triggering, solenoids, or another compatible accessory. Cleaner control box layout: These boards help organize spindle and accessory control inside your CNC cabinet instead of leaving the wiring scattered across separate components. Better than guessing parts individually: Many CNC builders realize they need both speed control and relay switching. This bundle gives you both together. Useful for VFD-based spindle setups: If your VFD supports external 0–10V analog speed control, this bundle gives you a strong starting point for CNC-controlled spindle operation. Common Uses VFD spindle speed control CNC-controlled spindle on/off or enable wiring Coolant pump switching Contactor triggering for larger spindle systems Solenoid or electro-valve control CNC router or CNC mill control box upgrades Replacing manual spindle speed adjustment with CNC-controlled speed output Simple Explanation The C41S-PWM helps your CNC controller send a speed command to a compatible VFD or spindle drive. The C37 acts like a CNC-controlled switch for one external device. Together, they help you build a cleaner spindle-control section inside your CNC control box. This bundle is best for customers who want spindle speed control plus one relay-controlled output without having to piece the parts together separately. Important Compatibility Notes The C41S-PWM is not a VFD and is not a spindle drive. Your VFD or motor controller must support external 0–10V analog speed control. Your CNC controller must provide the required PWM/control signal. The C37 relay board must be matched to the voltage and current requirements of the device you plan to switch. For larger motors, pumps, or high-current devices, use the relay to trigger a properly rated contactor instead of switching the load directly. Always verify your controller, VFD, relay load, wiring, and software settings before connecting power. Need help confirming compatibility? If you are not sure whether this bundle is right for your CNC spindle, VFD, or control box, contact us before ordering. We can help you check your controller output, VFD input requirements, and relay-control needs.
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