Penco Precision (Fontana, California), founded in 1975, is a medium-sized CNC precision engineering job shop with 17 CNC machines installed. The company specializes in tight tolerance batch work for clients in the aerospace, instrumentation, medical and computer peripheral supply sectors. Batch quantities go from a few to several hundred, with a lot falling between five and 25 parts. Tolerances are held as tight as 0.0002 inch on turned diameters up to 0.75 inch and positional tolerances to 0.001 inch. Occasionally, a true position (TP) feature is required when milling, which then demands precise and careful handling.
Since Penco acquired its first CNC machine in 1984, the plant has grown to eight CNC lathes and nine machining centers. Turning capacity up to 6 inches diameter by 15 inches length and machining center capacity up to 24 inches by 36 inches by 18 inches is now available. Machines include a CNC sliding head lathe specifically for slender shaft work and one lathe with C-axis capability. Other facilities include a 3D coordinate-measuring machine and a computerized job scheduling system, while the in-house quality systems are ISO 9002 compliant.
Penco used to develop part programs using fairly basic methods, according to Glynn Pennington, president. "The only off-line facility that we had was a simple computer-based text editor," he says. "The pressure to upgrade came from two directions. First, we were being asked to machine more complicated radius and blend features; second, as the number of machines increased so did the programming workload, which was increased due to the trend for short batch demand."
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