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High Precision Jig Grinding Machines March 1, 2017. Supertec Jig Grinder. Supertec Jig Grinder. Supertec has introduced three sizes of jig grinders covering a full range of capabilities. Models offered include the JG-510M (20 x 12 x 4 x 13 XYZW), the JG-1270CM (47 x 27 x 4 x 16 ) and the JG-1010G (39 x 39 x 10 x 16 ) double column style.