Custom Precision Tool Steel CNC Turned Parts

XCM CNC provides CNC turning for tool steel core pins, ejector pins, round punches, guide posts and bushings. This suits rotational parts with stepped outside diameters, bores and end faces used in injection molds, stamping dies, checking fixtures and automation equipment. Turning establishes a common rotational datum for guiding, ejection and locating fits. Outside diameters requiring tighter fits after hardening can receive drawing-based secondary operations such as grinding, EDM or wire EDM. The MOQ is 1 piece, prototype lead time is 3-7 days and typical lead time is 10-15 days, depending on complexity, quantity and heat treatment scheduling.

Stepped Diameters and Common Axis on Tool Steel Pins

Tool steel core pins, ejector pins and guide posts often feature stepped outside diameters and shoulders. Turning these mating sections from a common rotational datum helps control coaxiality between them. Coaxiality capability between stepped outside diameters and shaft/bore features is 0.012 mm, depending on drawing datums, fixturing and inspection methods.

Supporting Long Tool Steel Core Pins

Slender core-pin length-to-diameter capability is L/D 15:1. Higher ratios make the workpiece more prone to deflection and vibration, so length and diameter determine the use of steady rests, follower rests or staged operations rather than unsupported slender-shaft turning. Straightness capability is 0.01 mm / 1030 mm length, with material and heat treatment condition also requiring evaluation.

Finishing Hardened Tool Steel Guide Diameters

Heat treatment changes dimensions, so drawings for guide diameters and mating surfaces must state whether acceptance applies before or after heat treatment. Where IT5 or IT6 fits are required, necessary secondary operations such as grinding, EDM or wire EDM can supplement CNC turning. Grade and drawing requirements define hardness and final condition; there is no universal value for tool steel.

Turned Diameter vs Bored Hole Finish in Tool Steel Bushings

A guide bushing outside diameter and bore are different machined surfaces. Turned outside diameters can achieve Ra 0.8 um and bored holes Ra 1.6 um, requiring separate callouts. Roundness capability is 0.006 mm, with the route depending on turning, grinding or boring. Outside-diameter roughness values cannot be applied directly to bores.

Quality Systems and Turning Equipment

Factory production is managed through ISO 9001, ISO 13485, IATF 16949 and GJB9001C systems, with machining centers from DMG, Mazak, Matsuura and Brother. Turning equipment includes Jingshang automatic lathes and a Mazak i-100S turn-mill center with a second spindle, supporting milling and drilling operations required by these turned parts.

Turning Coverage from Small Parts to Long Shafts

Factory machining coverage extends from small connectors to large structural parts. Relevant turned parts range from core pins, ejector pins and guide bushings to shafts and sleeves 2000 mm long, with diameters up to 1250 mm at that length. Grinding, EDM or wire EDM can be coordinated with turning according to the drawing.

Equipment Matched to Accuracy Requirements

Critical shaft diameters, mating surfaces and general external geometry have different accuracy requirements. Machines are selected from four equipment tiers from mainland China, Taiwan, Japan, and Europe and the United States according to each operation, balancing machining quality and cost.

Single Replacement Parts and Sample Approval

The MOQ is 1 piece, suitable for replacement core pins, ejector pins, round punches or guide bushings. Prototypes take 3-7 days, with production following your sample approval.

Critical-Dimension Inspection and Reports

Stepped shaft diameters, roundness, coaxiality and runout can be inspected relative to drawing datums. Roundness uses a roundness tester, while coordinate dimensions use CMM measurement. CMM and FAI reports can be supplied according to the order in the customer’s report format.