Custom Alloy Steel CNC Turning and Milling Parts

Alloy steel shafts and flanges with radial holes, flats or keyways can be produced through combined CNC turning and milling, using a common datum system for rotational surfaces and side features. XCM CNC machines these parts on the Mazak I-100S and Jingshang 80 automatic lathe, with h6 shaft fits and H7 bore fits available. The company is certified to ISO 9001, ISO 13485, IATF 16949 and GJB9001C. The minimum order is 1 piece, with prototypes in 3-7 days and standard orders in 10-15 days. Equipment listed for this machining service includes Mazak I-100S, Jingshang 80 automatic lathe, DMG 80mono, Matsuura MX-520, Brother, Taichung, Shenyang CK61125X2000.

Alloy Steel Turned Shaft Datums for Milled Flats

Alloy steel turned-milled parts use the turned outside diameter as a datum. Outside surfaces can achieve Ra 0.8 um, with shaft diameter tolerances of h6/h7 or +/-0.005 mm. Flats and mounting faces are milled relative to this datum, with flat symmetry controlled to 0.02 mm. Coaxiality between stepped outside diameters is 0.012 mm.

Alloy Steel Radial Hole Drilling and Side Thread Tapping

Radial holes can be drilled down to a diameter of 0.2 mm, with hole-pattern position of 0.01 mm and deep-hole ratios up to L/D = 10. Side internal threads start at M1.4, with an effective blind-hole thread depth of 50 mm. Functional threads are checked with go/no-go or ring gauges. Intersections between radial and axial holes are prone to raised burrs, so cross-hole deburring is scheduled as a separate operation.

Alloy Steel Keyway Milling and Angular Position Control

Alloy steel shaft keyways have a minimum width of 1.0 mm and symmetry of 0.02 mm. Retaining-ring and seal grooves have a minimum width of 0.5 mm, while O-ring grooves have a minimum width of 1.0 mm and a depth tolerance of 0.01 mm. The angular position of a keyway relative to a flat or end-face hole follows the datum direction specified on the drawing.

Alloy Steel Long Shaft Turning Runout and Straightness

Alloy steel shafts can be turned to a maximum length of 2000 mm, with slender-shaft ratios up to L/D = 15:1. Shafts with higher length-to-diameter ratios use a steady rest or follower rest to reduce chatter and tool deflection. Shaft circular runout and face runout can both be controlled to 0.012 mm, with straightness of 0.01 mm / 1030 mm.

Quality Systems and Equipment for Combined Turning and Milling

We operate under ISO 9001, ISO 13485, IATF 16949 and GJB9001C quality systems and use machining centers from DMG, Mazak, Matsuura and Brother. CMMs and functional thread gauges help verify the combined features specified on the drawing.

Coordinating Turning and Side Machining around Common Datums

Turning and milling of outside diameters, radial holes, flats and keyways are planned according to feature accessibility. Suitable geometries can reduce setup changes, and any necessary grinding or EDM operations are evaluated against the drawing. Process planning does not assume that every feature can be completed in one setup.

Tiered Equipment Strategy for Low-Cost CNC Machining, Quality-Assured Production

XCM CNC uses four tiers of CNC equipment from mainland China, Taiwan, Japan, and Europe and the United States. Rough turning and drilling with less demanding tolerances run on mainland Chinese or Taiwanese machines. Finish turning of bearing seats and high-precision mating surfaces is assigned to imported machines such as DMG and Mazak. Matching equipment to the accuracy the part requires avoids using machines with higher hourly costs for simple operations and controls machining costs while meeting drawing requirements.

Drawing Feedback before Quotation

After receiving drawings, engineers check whether keyway phase, radial-hole datums and thread standards are fully specified. Missing angular datums or conflicting tolerances are raised before quotation to avoid drawing changes and delays after production starts.

Approved Programs and Inspection Plans for Repeat Orders

After the first batch is approved, machining programs, fixtures and inspection items are archived by part number. Repeat orders reuse these records to improve dimensional consistency between batches and avoid repeating machine setup development.