Steel Materials (Turning-Suitable Only)
For CNC turning, steel materials are selected based on machinability, strength, and dimensional stability:
Carbon Steel: Q235, 20#, 45#
Alloy Steel: 40Cr, 4140, 4340
Free-Cutting Steel: 1215, 12L14
Bearing Steel: GCr15
Material choice depends on mechanical requirements and service conditions.
CNC Turning Process Scope
Steel turned parts are produced through controlled turning operations:
CNC lathe turning
External and internal turning
Facing and grooving
Drilling and boring
Thread turning
Typical tolerance: ±0.02 – ±0.05 mm
(critical diameters can be controlled tighter if required)
Surface Condition & Finishing
Surface finish is selected according to functional and assembly requirements:
As-turned finish
Polished surface
Black oxide
Zinc plating
Nickel plating
Chrome plating
Surface treatments are applied after dimensional verification.
CNC Turning Equipment
Dimensional consistency depends on stable turning equipment:
Precision CNC lathes
Rigid spindle systems
Tailstock and steady rest support
Dedicated fixtures for repeat orders
Machine setup focuses on concentricity and diameter stability.
Inspection & Measuring Equipment
Steel turned parts are inspected using:
Digital calipers and micrometers
Outside / inside diameter gauges
Thread gauges
Dial indicators for runout
Surface roughness testers (if required)
Inspection focuses on diameter, concentricity, and thread accuracy.
Quality Control Logic
Quality control emphasizes repeatability of rotational geometry:
Raw material verification
In-process diameter monitoring
Final dimensional inspection
Batch traceability for long-term supply
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