are determined through running a tool to failure for the opera- tion, making these systems better for high-volume operations. Another indirect method his company offers are strain sensors embedded in the toolholders—as the tool wears, compression on the holder increases and is measured. “We are measuring very small tools, 0.004–0.006" [0.10–0.15 mm] in diameter,” he explained. He described horsepower sensors with resolution down to 0.001 hp, which may not be sensitive enough for such small tools.
Communications and Growing Use of RF
Advances in communication technology are also refining the use of on-machine probing. While data transferred by wires is often replaced by wireless transmission using infrared/ optical, radio frequency (RF) has distinct advantages and is growing in demand, according to Dave Bozich of Renishaw (Hoffman Estates, IL). “Optical requires line of sight [LOS], whereas RF does not,” he noted. “This makes it more adapt- able and convenient around machine tools, especially for
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larger machines, like large VTLs, or five-axis CNCs. IR/Optical is also limited by distance. Renishaw can deliver IR systems with 6 m of range. In contrast, our RF systems deliver reliable signals out to 15 m.” To satisfy this growing market, Renishaw recently intro-
duced its new RMI-Q multiple probe radio transmission system for automated on-machine tool setting, tool breakage detection, part setup, and part verification. The RMI-Q (the Q stands for Quad) operates four separate radio transmission probes on the same CNC machine. The RMI-Q is an enhancement of Renishaw’s existing RMI. Renishaw also introduced a Radio Tool Setter (RTS), an RF tool setting probe the company offers especially for CNC machining centers, or machines with rotary
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The waterproof TS35.20 tool setter is designed for use on milling and machining centers and is used to determine tool geometries. The precision measuring mechanism measures tool lengths and tool radii, measures individual cutting edges and detects tool breakage. (Hexagon)
tables or twin pallets where it is difficult to install wired setters. The RTS can measure both tool length and diameter of mill- ing cutters, twist drills, and end mills, according to Renishaw. Powered by two AA batteries, the company says it is compatible with Renishaw’s RMP60 and RMP600 spindle probes. “A better indication of tool wear is measuring the part against the nominal,” said Bozich, rather than measuring the