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Used Jig Grinding Machines for Sale 6

Jig grinding (also called coordinate grinding) finishes hardened tool steel components after heat treatment, producing precision bores, contours, and forms that hold position accuracy within 5 micrometres. Applications dominate punch and die manufacturing, plastic injection mould tooling, progressive die finishing, and precision gauge production — anywhere hardened tooling requires post-heat-treatment dimensional accuracy.

Used jig grinders on Exapro narrow the misc grinders category by filtering for jig-grinder-specific equipment — Moore G18/G48 mechanical machines, Hauser jig grinders, and modern CNC jig grinders. Filter by table dimensions, Z-axis capacity, planetary motion, and CNC capability. Submit an enquiry through the listing page on Exapro.

Showing 1 - 6 out of 6

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When jig grinding is essential

Jig grinding addresses the dimensional accuracy problem that arises when hardened tooling distorts during heat treatment. Tool steel components milled to size before hardening typically distort 25-100 micrometres during heat treatment, exceeding the tolerance budget for precision tooling. Jig grinding restores dimensional accuracy after heat treatment through abrasive material removal that conventional machining cannot perform on 60+ HRC steel.

The alternative post-heat-treatment processes have specific limitations. EDM produces excellent geometry but creates a recast layer that may compromise tool life. Hard milling with CBN tools handles some applications but cannot match jig grinding accuracy on small bores, deep slots, and complex contours.

Mechanical vs CNC jig grinders

Mechanical jig grinders (Moore G18, Moore G48, Hauser, Pratt & Whitney) use planetary motion systems where the spindle orbits within a controlled radius while the wheel rotates. The mechanical accuracy that hand-scraped slides and air bearings deliver remains the global benchmark — precision toolmakers continue using mechanical Moore machines decades after manufacture.

CNC jig grinders combine the planetary grinding principle with CNC control of the orbital radius and Z-axis. Modern CNC jig grinders from Hauser, Mitsui Seiki, Studer (Mikrosa division), and KGT produce complex geometries that mechanical machines cannot generate.

Applications and tooling

Applications dominate punch and die manufacturing — the matched-set punch and die requires bore dimensions accurate to 2-5 micrometres for proper clearance. Plastic injection mould tooling uses jig grinding for cavity contour finishing, ejector pin holes, and similar precision features. Progressive die finishing applies jig grinding across multiple stations of complex stamping dies.

Gauge production for thread gauges, plug gauges, and ring gauges relies on jig grinding for the dimensional accuracy that gauging tolerances demand. Calibration laboratories use jig grinders for reference gauge production.

Wheel inventory matters for production capability. Different bore diameters and contour geometries require specific wheel sizes and forms. Diamond and CBN wheels have largely replaced conventional abrasives for hardened steel work.

Browse used jig grinders on Exapro to compare Moore, Hauser, and CNC configurations from verified sellers worldwide. When evaluating used jig grinders, verify spindle accuracy through test bar measurement, check planetary mechanism backlash and concentricity, inspect way surfaces for wear that would affect coordinate accuracy, test Z-axis stroke accuracy, confirm CNC control function on CNC machines, and verify wheel inventory included with the purchase.