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Machining 24 MoldMaking Technology November 2015 milling capability. Some jig mills offer linear motion slideway systems that facilitate high-accuracy machining. The larger worktable of a jig milling machine can make it the only choice for processing some larger, heavier work- pieces. A jig mill's ability to perform operations other than boring may also eliminate the need to move a large workpiece to another machine, saving time and avoiding loss of accuracy during the transition. Thermal stability of the machine tool is a key factor in maintaining bore tolerances. When results are measured in microns, even small temperature-driven changes in machine dimensions will significantly affect machining accuracy. Machine castings are engineered to provide stable thermal characteristics, and a typical jig boring machine will have components arranged symmetrically, so they will react to temperature changes evenly. For maximum accuracy and consistency, many shops operate their jig boring machines in temperature controlled-environments. Jig Effects The specialized nature of jig boring and milling machines results in their infrequent replacement. Effective life cycles of 25 years are not unusual. However, the mature technological capabilities of older machines usually require skilled personnel to produce parts with maximum quality. In addi- tion, machine wear over time can affect the accuracy of the machining process. Shops should evaluate the output of their current jig boring and milling machines in terms of what is available with present-day technology. Look for machines whose capabili- ties are continually improving with advances such as ceramic ball bearings for spindles, four- and five-axis CNC operation, 0.0001-mm-resolution lin- ear scale feedback, and new design and casting technologies to boost accuracy and productivity. The mold industry is facing global competition on quality and price, and machines that offer the ability to increase output while improving accura- cy are a driving force behind new invest- ment in mold base manufacturing. CONTRIBUTOR Tom Dolan is vice president of Mitsui Seiki USA Inc. FOR MORE INFORMATION: Mitsui Seiki USA Inc. 201-337-1300 mitsuiseiki.com As one of the early pioneers developing CAD/CAM software for manufacturing, Cimatron will continue its 33 year legacy going forward as part of 3D Systems. Look forward to new opportunities for MANUFACTURING THE FUTURE! Cimatron is now part of 3D Systems THINGS ARE GETTING BIGGER AND BETTER For more information go to: www.3dsystems.com | www.cimatrontech.com