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Precision CNC Machined Gear Shafts: Engineering Guide & FAQ
Precision CNC Machined Gear Shafts: Engineering Guide & FAQ
From raw billet to ±0.005mm tolerance — how PFTWORLD manufactures stepped spur gear shafts for industrial power transmission.
What Is a CNC Machined Gear Shaft?
A CNC machined gear shaft integrates a spur gear and a precision shaft into one stepped component, eliminating keyway slippage and assembly stack-up error common in pressed-fit designs. Machined from 303/304 stainless steel billet on CNC turn-mill centers, each shaft combines hobbed or wire-EDM gear teeth with ground shaft diameters, keeping the gear pitch circle and mounting bore in true concentricity.
Key Manufacturing Parameters
Typical Applications
These stepped gear shafts are widely used in precision gearboxes, robotics actuators, medical pumps, optical instruments, and automated packaging equipment — wherever compact torque transmission and low backlash are required.
What tolerance can CNC machining achieve on a gear shaft?
Standard CNC turning and milling hold ±0.01mm on shaft diameters, while ground finishing and wire-EDM gear profiles tighten this to ±0.005mm for high-precision transmissions.
Which material is best for a stainless steel gear shaft?
303 stainless offers superior machinability for complex profiles, while 304 provides better corrosion resistance in washdown or medical environments; both support HRC 45–55 after heat treatment.
Can gear teeth and shaft be machined in one setup?
Yes. Turn-mill CNC centers combine hobbing, turning, and milling in a single fixture, maintaining true position between gear and shaft without secondary alignment.
What surface finish is typical for precision gear shafts?
Ra 0.4–0.8μm is standard after grinding or polishing, reducing friction and noise in meshing gear trains while supporting passivation for corrosion protection.
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