Custom Precision Aluminum CNC Turned Parts

XCM CNC machines custom precision aluminum CNC turned parts up to 1250 mm in diameter and 2000 mm in length on a Shenyang CK61125X2000 CNC lathe. Parts include bushings, stepped shafts, threaded fittings and cylindrical housings. Internal and external fits can meet h6/H7, with 0.012 mm coaxiality and 0.012 mm runout. Boring, threading, grooving, knurling, edge breaking and anodizing are available. Small-batch and automatic turning work is machined on Mazak I-100S and Jingshang 80 automatic lathes.

Aluminum parts are lightweight and easy to machine, making them suitable for lightweight mechanisms and compact electronic housings. The factory is certified to ISO 9001, ISO 13485, IATF 16949 and GJB9001C. Orders start at one piece. Prototypes typically take 3-7 days and production typically takes 10-15 days, depending on part complexity and quantity.

Aluminum CNC Turned Stepped Diameters and Bores: 0.012 mm Coaxiality, 0.006 mm Roundness

Bushings, interface rings and cylindrical housings can include multiple internal and external diameters, stepped bores and locating end faces. Mating diameters can achieve 0.012 mm coaxiality, 0.006 mm roundness and 0.01 mm radial runout, inspected against the specified rotational datum. Turned outside diameters achieve Ra 0.8 um and bored holes Ra 1.6 um. Bearing and sealing features can also be controlled to h6/H7 fit classes.

Aluminum Long-Shaft CNC Turning: L/D 15:1 with Straightness 0.01 mm

Slender aluminum shafts support a length-to-diameter ratio of L/D = 15:1 and a maximum turning length of 2000 mm. At high rotational speeds, gravity and cutting forces can deflect long shafts. A steady rest or follow rest supports the middle of the workpiece, while reduced feed and depth of cut limit radial forces. Long outside diameters can achieve straightness of 0.01 mm / 1030 mm and cylindricity of 0.011 mm / 1030 mm. Coaxiality between mating sections at both ends is inspected against drawing datums.

Aluminum CNC Turned Threads, Grooves and Knurling: M1.4-M220 Range

Internal and external threads, annular grooves and knurling on aluminum fittings, focusing rings and knobs are produced during turning. Minimum turned groove width is 0.5 mm, thread depth is 4 x D and effective blind-hole thread depth is 50 mm. Straight or diamond knurling with a module of 0.3-1.0 suits gripping surfaces on knobs and handles. Connection threads are machined to the specified standard and class, then checked with go/no-go gauges or thread ring gauges.

Aluminum CNC Turned Parts with Anodizing Compensation: h6/H7 Fits after 25-60 um Coating

Mating outside diameters on aluminum bushings and cylindrical parts are turned to h6 (+/-0.005 mm), and mating bores to H7 (+/-0.006 mm). Hard anodizing thickness of 25-60 um can affect fit dimensions more than the machining tolerance itself. Machining allowances are calculated from coating thickness and fit class. Standard anodizing at 8-15 um has a smaller dimensional effect on non-mating faces. Threads and precision mating surfaces can be masked, and final dimensions are accepted against the drawing after anodizing.

Turning Equipment and Quality Systems

XCM CNC operates Mazak I-100S, DMG 80mono, Matsuura MX-520 and Brother machining centers, along with Jingshang 80 automatic lathes. Its quality systems include ISO 9001, ISO 13485, IATF 16949 and GJB9001C to support custom part machining and quality management.

Complete Supporting Operations from Small Connectors to Large Structural Parts

The machining range covers small connectors through large structural parts. Turned parts can include boring, threading, grooving, knurling, edge breaking and anodizing, allowing complete parts to be sourced to their structural and surface requirements.

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

XCM CNC groups its CNC equipment into four tiers: mainland China, Taiwan, Japan, and Europe and North America. Lower-tolerance operations such as rough turning and non-mating outside diameters use mainland Chinese or Taiwanese equipment. Finish turning of bearing seats and boring of mating holes requiring h6/H7 accuracy use imported machines such as DMG and Mazak. Equipment is matched to each part’s actual accuracy requirements to reduce machining costs while meeting drawing requirements.

Rotational Geometry Inspected against Drawing Datums

Mating outside diameters and bores are accepted to h6/H7 using ring and plug gauges. Threads are checked with go/no-go gauges or thread ring gauges. Coaxiality, roundness and runout are inspected with a Hexagon CMM against drawing datums, and report datums match the drawings. CMM reports and material certificates can be supplied. Repeat orders use the first batch’s inspection plan.

Anodized Fit Dimensions Delivered to the Drawing’s Fit Classes

Allowances for mating outside diameters and bores on bushings and cylindrical parts are included during turning based on coating thickness. Hard anodizing at 25-60 um significantly affects h6/H7 fits, so allowance is calculated from coating thickness and fit class. Threads and precision surfaces that do not require anodizing are designated as masked areas. Final anodized dimensions are checked with gauges against drawing fit classes, with surface treatment and assembly fits delivered as one finished part order.