Infrastructure

Sumex Auto Tech operates a machining-focused manufacturing facility in Punjab, India, equipped for vertically integrated production of UJ Crosses and propeller shaft components. The setup spans CNC/VMC/HMC machining, gear hobbing, broaching, induction hardening, centreless and cylindrical grinding, dynamic balancing, surface treatment, and a calibrated QA laboratory.

Manufacturing Capabilities

Machining — CNC / VMC / HMC

CNC machines — Turning of UJ cross bodies, shaft diameters, and yoke profiles
VMC machines — Multi-face milling operations requiring positional and angular feature control
HMC machines — Batch production with controlled datum referencing and cycle consistency
Multi-axis capability — Complex geometries machined in-house without outsourcing

Operator at a CNC turning machine with machined components

Gear & Spline Processing

Gear hobbing machines — External spline profiles — controlled module and pressure angle
Broaching machines — Internal spline generation with profile accuracy and fitment control

Operators at vertical broaching machines

Heat Treatment

Induction hardening setup — Controlled power, frequency, and dwell parameters — case depth and HRC verified per batch
In-house capability — Eliminates external heat treatment dependency — process parameters fully controlled

Spline shaft being induction hardened with quench water

Grinding Section

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

Dynamic Balancing

Propeller shaft sub-components — Flange yokes, stub shafts, and assembled sections balanced to specification to reduce in-service vibration

Surface Processing

Shot blasting — Removes oxide and scale before inspection and coating
Glide coating — Corrosion resistance and assembly-compatible surface treatment on functional features

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
Hubs, castings, off-highway components	Application-specific grade	Hubs, castings, off-highway components

All material inputs are processed with traceable heat numbers, verified against controlled specifications, and linked to the production lot record.

QA Laboratory

Instrument	Range / Application
Micrometers	0–25 mm to 200–300 mm — external diameters
Bore Gauges	Internal diameter measurement
Digital / Dial Vernier Calipers	General linear dimensions
Height Gauges	Reference datums and step heights
Dial Indicators	Runout and concentricity verification