Custom Zinc CNC Turning and Milling Parts

After CNC turning and milling of zinc alloy die-cast connector bodies, coaxiality between rotational registers can be controlled to 0.012 mm, and hole-pattern position to 0.015 mm, according to drawing datums. XCM CNC first turns bores, outside diameters and end faces to establish datums, then machines side holes, flats and mounting slots so interface orientation and mating surfaces can be inspected as related dimensions. Factory equipment includes the Mazak i-100S turn-mill center and DMG 80mono 5-axis machine. XCM CNC is certified to ISO 9001, ISO 13485, IATF 16949 and GJB9001C. The MOQ is 1 piece, prototypes take 3-7 days and standard lead time is 10-15 days. Equipment listed for this machining service includes DMG 80mono, Mazak i-100S, Matsuura MX-520, Jingshang 80 automatic lathe, Brother / Taichung / Qiao Feng CNC 3016-4A machining centers, Shenyang CK61125X2000 lathe.

Zinc Turn-Mill Coaxiality and Side-Hole Position

With the turned axis as the datum, zinc alloy connector bodies can achieve inside-to-outside diameter coaxiality of 0.012 mm and side-hole pattern position of 0.015 mm. Specify rotational axes and angular datums using ISO 1101 or ASME Y14.5 so side holes and flats have clear inspection references. Gate remnants and parting lines on die-cast blanks affect the first setup, so end faces and registers are turned first and then used as datums for milling side features.

Zinc Threaded Connectors with Milled Flats and Keyways

The Mazak i-100S turn-mill center has a second spindle and can produce turned threads, shoulders, wrench flats and keyways on zinc alloy parts on the same machine. Internal threads start at M1.4 and external threads at M2.0. Pipe threads support NPT, BSP, G and PT standards. Minimum keyway width is 1.0 mm, with symmetry controlled to 0.02 mm. Functional threads are checked with go/no-go gauges.

Zinc Cross-Hole Drilling and Internal Deburring

Minimum drilled hole diameter in zinc alloy parts is 0.2 mm, with deep-hole ratios up to L/D = 10. Cross-hole intersections can be deburred wherever tools can reach. Zinc is relatively soft and hole entrances can develop raised edges. Internal burrs may damage O-rings or block passages, so drawings must define burr and cleanliness requirements at intersections. A minimum blind-hole bottom allowance of 0.3 mm reduces the risk of drilling through thin die-cast walls.

Zinc Surface Roughness Grading and CMM Inspection

Turned zinc alloy outside diameters can achieve Ra 0.8 um, fine-milled faces and bored holes Ra 1.6 um, and general milled faces Ra 3.2 um. Specify these by surface function. Coaxiality and position are measured on a Hexagon Inspector Classic 06.08.06 CMM. Side-hole spacing and flat dimensions are checked on a WanHao Rational VMS-3020G 2.5D vision system. Where plating is required, the effects of 3-20 um coatings on registers and threads must be assessed against order requirements before dimensions are finalized.

Quality Systems and Turning and Milling Equipment

Projects operate under ISO 9001, ISO 13485, IATF 16949 and GJB9001C quality systems. Equipment resources include DMG, Mazak, Matsuura and Brother. The Mazak i-100S turn-mill center supports turning, milling and drilling.

Relating Rotational Datums and Radial Features

Registers, side holes, flats and mounting slots on die-cast connector bodies can be planned together with deburring and plating services evaluated for the zinc substrate, helping control relative positions and post-plating fits.

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. Zinc part end faces and general holes with wider tolerances use mainland Chinese or Taiwanese machines. Registers and side holes requiring high coaxiality and position accuracy use imported equipment such as DMG and Mazak. Machines follow actual feature accuracy, keeping simple operations off equipment with higher hourly costs and reducing costs while meeting drawings.

Inspection Reports Accompany Delivery

Each batch includes a dimensional inspection report. CMM and FAI reports can use the customer’s format. Reports correspond directly to drawing datum identifiers, allowing item-by-item comparison during incoming inspection without recalculation.

Sample Approval before Production, with NDA Protection

Production follows sample approval so you can first verify registers, side-hole orientation, threads and internal deburring. Material grades and certificates are matched to customer-specified information. An NDA can be signed before drawings are received if required.