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What is the typical CNC job work rate per hour in India?

CNC job work rates in India vary by machine type and complexity: 2-3 axis CNC turning: Rs.400–Rs.1,200/hr; 3-axis VMC milling: Rs.600–Rs.1,800/hr; 4-axis machining: Rs.900–Rs.2,500/hr; 5-axis simultaneous: Rs.1,800–Rs.5,000/hr. Rates are influenced by machine vintage, location (Pune and Bengaluru command a premium over Rajkot and Ludhiana), batch size, material difficulty, and quality certification level. Prototype machining is often priced per component rather than hourly.

What is the difference between CNC turning and VMC milling job work?

CNC turning uses a rotating workpiece and stationary cutting tool – ideal for cylindrical and rotational components (shafts, bushings, flanges, pins). CNC lathes are 2-4 axis. VMC (Vertical Machining Centre) milling uses a rotating cutting tool on a stationary workpiece on a horizontal table – ideal for prismatic components (housings, brackets, plates, moulds). VMCs are typically 3-axis; HMCs (Horizontal Machining Centres) are preferred for large, complex box-type components. Most full-service job work shops operate both to handle complete component families.

What tolerances can CNC job work shops in India typically achieve?

Standard CNC turning and milling: ±0.05mm (general purpose), ±0.02mm (precision grade), ±0.01mm (high precision – requires good machine condition and temperature-controlled environment). CMM-verified capability: ±0.005mm (tight tolerance, requires modern machining centres with Renishaw probing). Surface finish: Ra 3.2 (standard), Ra 1.6 (precision), Ra 0.8 (fine), Ra 0.4 (mirror-grade, requires grinding or superfinishing). Always specify your required tolerance and surface finish on the drawing – do not rely on verbal assurances.

What materials can CNC job work shops in India handle?

Most established Indian CNC job work shops handle: ferrous metals (MS, EN8, EN24, EN36, EN19, stainless steel 304/316/410/630); aluminium alloys (6061, 6082, 7075, 2024); non-ferrous (brass, copper, bronze); engineering plastics (Delrin/POM, PTFE, nylon, UHMWPE, polycarbonate). Specialist shops handle exotic alloys: titanium (Grade 2 and Grade 5), Inconel 718/625, Hastelloy, and duplex stainless – these require premium tooling and command 3–5x standard rates. Always confirm exotic material experience with a material test and sample before production.

What is PPAP and when is it required for CNC job work?

PPAP (Production Part Approval Process) is an automotive industry standard (AIAG PPAP manual) for approving new component suppliers and part designs before production release. It requires submission of dimensional measurement results, material/performance test results, process flow diagrams, control plans, MSA studies, and initial process capability studies (Cpk). PPAP is required by most automotive Tier-1 customers before volume production begins. IATF 16949-certified CNC shops are experienced with PPAP submissions – confirm PPAP level capability (Level 1–5) with your supplier before engagement.