Custom Precision Alloy Steel CNC Milled Parts

XCM CNC mills alloy steel mounting faces with flatness controlled to 0.02 mm over an area of 1030 x 1030 mm. This capability suits transmission shift forks, support seats and reducer connecting blocks that locate through faces and hole patterns. Small precision parts are machined on a Matsuura MX-520, while large support seats use a Qiao Feng 3016-4A with travel of 3000 x 1600 x 1400 mm. 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 Qiao Feng CNC 3016-4A, Matsuura MX-520, DMG 80mono, Mazak I-100S, Brother, Taichung.

Large Alloy Steel Mounting Face Flatness and Parallelism

Alloy steel mounting faces can achieve flatness of 0.02 mm over 1030 x 1030 mm and parallelism of 0.03 mm / 1030 mm. When both sides of a large flat part require machining, one face is finish milled first to establish a datum, then the part is flipped to machine the opposite face and control parallelism. Large support seats over 500 mm have an overall dimensional tolerance of +/-0.05 mm.

Alloy Steel Locating Hole and Bolt Pattern Milling

Alloy steel locating holes can achieve H7/H8 or +/-0.005 mm tolerances, with reamed surfaces at Ra 1.6 um. Hole-pattern position can be controlled to 0.01 mm for locating and bolt holes in reducer connecting blocks and motor mounts. Blind holes require at least 0.3 mm of stock at the bottom, and the maximum effective thread depth in a blind hole is 50 mm.

Alloy Steel Fork Slot Symmetry and Thin Rib Milling

Transmission shift fork openings can achieve symmetry of 0.02 mm and perpendicularity of 0.02 mm / 1000 mm. Ribs on lightweight load-bearing parts can be as thin as 0.8 mm with a height-to-width ratio of 8:1; metal walls can be as thin as 0.5 mm. Thin-rib parts undergo stress-relief aging after rough milling and before finish milling to size, reducing distortion.

Alloy Steel Sealing Faces and Step Height Inspection

Sealing faces on reducer connecting blocks can achieve Ra 0.8 um, and precision datum faces can achieve Ra 0.4 um after lapping. Cosmetic faces have a surface roughness of Ra 1.6 um, with uniform tool marks and no pronounced texture to the touch. Step heights are measured with a TRIMOS 600L height gauge, and the relative positions of hole patterns and faces are measured with a Hexagon Inspector Classic 06.08.06 CMM.

Quality Systems and Inspection Equipment for Load-Bearing Parts

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 height gauges help verify the assembly dimensions specified on the drawing.

Finishing Routes for Fork Openings and Deep Slots

When mounting faces, fork openings or pockets require precision dimensions, CNC machining and any necessary grinding, EDM or wire EDM operations are evaluated against the drawing. The specified grade, heat treatment condition and final dimensions determine the sequence of operations.

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 milling and slotting operations with less demanding tolerances run on mainland Chinese or Taiwanese machines. Precision boring of locating holes and machining of precision mounting faces are assigned to imported machines such as DMG and Mazak. Matching equipment to the accuracy required for each operation avoids using machines with higher hourly costs for simple work and reduces machining costs while meeting drawing requirements.

Coordinated Heat Treatment and Surface Finishing in One Order

XCM CNC coordinates heat treatment such as quenching and tempering or nitriding, together with surface treatments such as nickel and zinc plating, so customers do not have to source several suppliers. Heat treatment, plating and coating-thickness reports can accompany delivery according to order requirements.

Optional 100% Inspection of Critical Dimensions for Batch Orders

Batch orders can include 100% inspection of critical dimensions and appearance, with the scope defined by the drawing and order requirements. Assembly-related dimensions such as fork opening width and locating holes are suitable candidates for full inspection.