Gear Rack for Machine Tool Industry | CNC, Milling, Grinding, OEM Supply

🎯 Precise Linear Motion

DIN6-8 milled racks deliver 0.02-0.05 mm pitch accuracy; DIN5-6 ground racks deliver below 0.01 mm. In a closed-loop servo system with encoder feedback, the ground rack allows the controller to achieve and maintain positioning repeatability below 0.005 mm — the level required for precision contouring and tight-tolerance hole placement on aerospace and medical parts.

💪 High Load Capacity

Machine tool axes must resist the full cutting force applied perpendicular to the direction of travel during heavy-duty operations. Ever-Power machine tool racks in 42CrMo with induction-hardened tooth flanks at HRC 50-55, or in 20CrMnTi carburized at HRC 58-62, provide tooth root bending strength sufficient for the peak cutting forces encountered in roughing passes on cast iron and hardened steel.

⚡ Efficient Power Transmission

Direct tooth engagement gives mechanical efficiency above 95%. In a machine tool drive, this means the servo motor can be specified for the actual cutting power plus a modest friction allowance — there is no large worm-gear efficiency loss to account for. The lower thermal dissipation in the drive train reduces thermal growth of the axis structure that would otherwise cause drift in thermal equilibrium.

∞ Unlimited Stroke Length

For large-format machine tools — planer mills, portal milling machines, and transfer lines — with table travel exceeding 6 m, a ball screw becomes impractical due to critical speed and deflection. Rack sections are simply butted end-to-end with precision half-tooth joints, giving unlimited table travel at the same pitch accuracy throughout.

🔥 Low Backlash

Ground racks with close DIN5-6 tolerance pinions and accurate centre distance control minimise backlash at zero hardware cost. For applications requiring near-zero backlash, a twin-pinion preload arrangement provides the stiffest, most accurate linear drive achievable with rack and pinion technology.

📈 Cost-Effectiveness

At table travels above 2 m, a rack and pinion drive costs significantly less than a ball screw and nut system of equivalent accuracy class. The savings increase with travel length and are compounded by the lower risk of screw whip at high traverse rates that would require additional screw support bearings in a ball-screw design.

Installation

Position the rack on a clean, precision-scraped or ground mounting surface. Align the rack parallel to the machine axis guideway within 0.01 mm over the full travel. Verify centre distance between rack and pinion with a dial gauge at multiple points. Tighten fasteners in the recommended sequence from mid-rack outward; torque to specification. Test-run the axis at slow speed before commissioning at full feed rate.

Lubrication

ISO VG 68 way oil via automatic lubrication injector (0.1-0.2 ml per cycle) is standard for machine tool rack drives. This keeps tooth flanks lubricated without excess oil contaminating the workpiece or guide surfaces. Avoid grease — it traps chips and cutting fluid residue, accelerating abrasive wear on precision flanks.

Maintenance and Inspection

Inspect rack tooth flanks for wear at each scheduled machine service. Any surface pitting or polishing away of the ground finish indicates the start of fatigue damage. Check axis positioning accuracy by cutting a test piece at each maintenance interval — a trend toward increasing positioning error before wear is visible by eye warns of impending rack replacement need.

Step 1 — Raw Material

Raw material bar stock verified by spectrochemical analysis before production.

Step 2 — Tooth Cutting

Teeth cut on CNC rack milling or hobbing machine to specified module and pressure angle.

Step 3 — Deburring

Tooth-end burrs removed and edges chamfered to prevent handling damage and sharp corners.

Step 4 — Straightening / HT

Pressure straightening after tooth cutting; induction hardening or carburising where specified.

Step 5 — End Machining

End faces and mounting holes machined in CNC machining centre to drawing specification.

Step 6 — Surface Treatment

Black oxide, zinc plating, phosphating, or hard chrome applied per customer specification.

Gear Hobbing Machine

Gear Milling Machine

CNC Gear Grinding Machine

Gantry CNC Machining Centre

Internal Grinding Machine

Planer Grinding and Turning

Precision Measurement Equipment

ISO 9001:2015 and Quality Certificates

Spur Gears

Pinion gears matching our spur gear rack range; standard modules m0.5 to m20.

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Ring Gears

Large-diameter internal or external ring gears for rotary and slewing drives.

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Bevel Gears

Straight and spiral bevel gears for right-angle drives and gear motor input stages.

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Helical Gears

Helical pinions for high-speed, low-noise rack drives and reduction stages.

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Planetary Gear Sets

Compact in-line reducers paired to servo motors; output shaft connects to the rack pinion.

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Worm Gear Wheels

Self-locking worm reducers for vertical rack axes holding position under gravity load.

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Plastic Gears

Nylon, POM, and polycarbonate pinion gears for light-duty, lubrication-free rack drives.

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What precision grade should I specify for a CNC machining centre axis rack?

For a standard CNC machining centre with rotary encoder feedback and no linear scale, DIN6 ground helical rack is the industry standard — it gives pitch accuracy below 0.012 mm per 300 mm that a servo drive can compensate for. For five-axis machines or machines with linear scale feedback, DIN5 ground provides the tightest available accuracy and eliminates any residual drive-train contribution to the machine volumetric error budget. For transfer lines, flame cutters, and general-purpose CNC routers where positioning tolerance is 0.05 mm or greater, DIN7 or DIN8 milled rack is adequate at lower cost.

What causes increased backlash in a machine tool rack drive over time?

The primary cause is tooth flank wear from abrasive contamination in the lubricant — chips, grinding dust, and coolant residue entering the rack-pinion mesh increase the wear rate of both components. Secondary causes include: centre distance drift from loosening of the pinion bearing housing fasteners; thermal growth of the machine structure shifting the rack relative to the guideway; and incorrect initial centre distance setting during commissioning. Inspect and re-torque pinion housing fasteners at each scheduled service. If backlash has increased by more than 50% from the commissioning value, plan rack and pinion replacement within the next service interval.

Can gear racks be supplied to match a specific machine tool OEM specification?

Yes. Send us the machine OEM part number, drawing, or dimensions of the existing rack section including module, section length, face width, precision grade, material, and mounting hole pattern. We produce exact-dimension replacement racks for all major machine tool brands. For new machine designs, send us the required axis force, traverse speed, table travel, and positioning accuracy specification and we will design the rack specification from first principles and propose milled or ground variant depending on the accuracy requirement.