Flexible Conduit
Flexible conduit is a bendable protective tubing used to route and shield electrical cable, control wiring, data lines, or pneumatic/utility lines where the run must move, vibrate, or navigate tight machine geometry. In CNC and machine-tool use, it protects moving axes, spindles, servo motors, and control wiring. It combines flexibility, abrasion resistance, and, in some types, crush resistance or liquid-tight protection.
On a CNC machine, flexible conduit is routed from the fixed cabinet to moving assemblies such as X/Y/Z axes, motor junctions, spindles, or tool-changing components. It controls cable slack and protects conductors through continuous motion. The conduit is paired with matching fittings or cord grips, and the bend radius must stay within spec so the cable bundle is not pinched or work-hardened during travel. Metallic flexible conduit is chosen when mechanical protection and flame/impact resistance matter most; nonmetallic or braided versions suit designs requiring flex life, abrasion resistance, EMC shielding, or lighter weight. In wood CNC or dust-extraction setups, the hose must track rapid gantry movement without pinching, so installers match inside diameter, wall thickness, and clamping practice to acceleration and travel patterns. A typical machine-tool grade product may be a galvanized steel core with a liquid-tight PVC jacket designed for tight bend radii and temperatures from -20°C to 60°C.
When should metallic flexible conduit be chosen over braided or nonmetallic types?
Choose metallic flexible conduit when crush resistance, basic mechanical protection, and a machine-tool standard installation are needed. Choose braided or liquid-tight systems when abrasion, EMI/EMC shielding, coolant exposure, or higher flex performance are critical.
What makes a conduit suitable for moving CNC axes?
It must tolerate repeated dynamic bending, maintain a safe bend radius, resist abrasion from cable motion, and preserve termination integrity under acceleration and deceleration.
Why are cord grips and matching fittings important?
They prevent axial pull, torsion, and connector walkout, which are common causes of intermittent open circuits in servo, spindle, and control wiring on moving machines.