Capabilities

Sumex Auto Tech operates a process-integrated facility for driveline component manufacturing. The setup combines CNC/VMC/HMC machining, gear hobbing, broaching, induction hardening, centreless and cylindrical grinding, and surface finishing under one roof — enabling control over dimensional geometry, metallurgical properties, and batch consistency throughout production.

Critical features are maintained within tolerances up to ±0.005 mm, supported by in-process inspection at defined production stages and final verification before batch release. Statistically consistent output across production lots is a baseline requirement, not a claimed aspiration.

Manufacturing Capabilities

CNC / VMC / HMC Machining

CNC turning of UJ crosses, shafts, and yoke bodies — Diameter control, shoulder geometry, and face features maintained to drawing

VMC multi-face milling — Positional and angular feature accuracy across multiple faces in a single setup

HMC batch production — Consistent datum referencing and throughput for production lots

Multi-axis capability — Complex geometries machined in-house without outsourcing

Gear & Spline Processing

Gear hobbing — External splines with controlled module and pressure angle

Broaching — Internal splines with profile accuracy and fitment control

Heat Treatment — Induction Hardening & Surface Hardening

Induction hardening — Applied on trunnion surfaces, bearing seats, and spline roots, with power, frequency, and dwell time controlled

Verification — Case depth and hardness (HRC) verified batch-by-batch

Surface hardening — Parameters aligned with fatigue and wear specifications where the application requires

Grinding & Finishing

Centreless grinding — Trunnion ODs, shafts, and cylindrical features to final size and surface finish

Cylindrical grinding — Precise diameter and roundness on critical bores and ODs

Surface Treatment

Shot blasting — Removes oxide and scale before inspection and coating

Glide coating — Corrosion resistance and assembly-compatible surface treatment on functional features

Engineering Capability

Development from drawing or sample — Manufacturability, tolerance feasibility, and process routing reviewed before quoting

Documentation — Control plans, dimensional reports, and PPAP Levels 1–5 per customer requirement

Materials Processed

Material	Specification Reference	Typical Application
Alloy steels	EN 10083, SAE / ASTM A29 — grade per application	UJ crosses, yokes, shafts
Carbon steels	EN 10277 / EN 10278, relevant IS specifications	Flanges, hubs, fabrication parts
SG iron	Application-specific grade	Hubs, castings, off-highway components