FANUC's RoboCut α-CiA series of wire EDMs with a Series 31i-WB control features Volumetric Taper Compensation (TPCMP) with four-axis overburn control for enhanced taper accuracy on any material, thickness or angle within specifications. The concept is to adjust the position of the top and bottom wire guides by a precalculated value so that the wire moves slightly away from the workpiece surface where the taper settings would otherwise create an overburn situation caused by the "slower" relative movement of the wire. This compensation reduces wire breakage while maintaining taper cut accuracy to ±0.0008 inch, the company says.
Three models feature XYZ travels ranging from 14.6" × 10.6" × 10.2" (with UV travels of ±2.362") to 23.6" × 15.7" × 16.2" (with UV travels of ±3.937"). The C400iA and C600iA can manufacture complex components with seven-axis simultaneous machining options. The series is suitable for a range of materials including cobalt-chrome, high-nickel alloys and titanium in applications the aerospace, medical and military industries.
For graphite cutting, a Pulse Mode achieves good surface finish in a single pass for time savings and consistency when machining electrodes. The mode can cut ribs as thin as 0.013" and graphite as thick as 8". An anti-recast power supply offers virtually undetectable recast in high-nickel alloys, stainless steel and titanium.
The power supply and twin servo tension control are designed to make thin wire cutting more efficient. The system offers reliable threading of 0.002" diameter wire through a 0.006" diameter start hole with tungsten wire, and inside corner radii as small as 0.0011". The Auto-Threader features a Taper AWR, enabling threading at a taper angle in threads of 5 degrees as thick as 2".
As an accessory, a single-access CCR rotary table provides a range of motion suitable to the demands of wire EDM applications in the medical and aerospace industries. The rotary table has a water leak monitoring function that shuts down the machine upon detection to minimize water-related repairs.