Included in the design are ceramic insulators placed between the worktable and machine casting to reduce stray electric capacitance and enable the SPG II machining circuit to stabilize microelectrical discharges. Utilizing these capabilities under standard machining conditions for a 0.79-in.-thick workpiece measuring up to 3.93 by 3.93 in., users can achieve 0.2-µm Rz surface finishes.

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They are available in two cutting geometries: Jet-Cut™ for both roughing and finishing in steel applications, and Coolant-Through TiNox-Cut™ for roughing in tough materials such as INCONEL® alloys, titanium, and stainless steel.

Standard and long-length rougher/finishers with flute length/diameter ratios of 2-to-1, 3-to-1, and 4-to-1 are available.

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Using oil-based dielectric fluid also eliminates the soft layer that can result from the EDM process and surface corrosion caused by electrolytic action. According to Makino, in long-run applications in which machined parts remain submerged for extended periods, this can be critical in controlling corrosion or oxidation layers susceptible to these effects.

These machines feature a fixed table design in which axis movements are controlled by machining heads.

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The table’s electrically conductive machining area also can be limited for jobs requiring a surface finish better than 0.2 µm Rz. This further reduces stray electric capacitance for surface finishes down to 0.08 µm Rz (actual measured value).

Emuge Corp. has released Trochoidal End Mills, a new line of solid-carbide end mills with geometry and chipbreakers specifically designed for trochoidal milling.

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Makino has released the UPV-3 and UPV-5 wire EDMs designed with an oil-based dielectric fluid system for high-accuracy machining of hardened materials and mirrorlike surface finishing capabilities.

In similar performance tests using carbide, these machines performed up to 22 percent faster than water-based machines, and up to 78 percent faster than prior oil-based technology with good sealed flushing, the company states.

Keep up to date with the latest news, events, and technology for all things metal from our pair of monthly magazines written specifically for Canadian manufacturers!

Keep up to date with the latest news, events, and technology for all things metal from our pair of monthly magazines written specifically for Canadian manufacturers!

These tools increase metal removal rates and enable fewer toolpaths to be used, while enabling a high axial depth of cut of up to 4xD, the company reports. They were developed specifically for advanced milling strategies available in modern CAM software to optimize the calculation of milling paths and avoid unproductive tool motion.

The thermal control system maintains constant dielectric and casting temperatures, and the company’s latest SPG II circuit improves finishing operations. Together these features create a rigid, reliable, high-accuracy machining platform capable of producing surface finishes to 0.08 µm Rz, the company states.

The end mills feature low vibration characteristics such as variable spacing, variable helix angles, and improved microgeometries, along with new, high-performance coatings of TiN/TiAlN or AlCr and a sub-micrograin carbide substrate. In addition, the newly developed chipbreaker geometry reduces axial pullout force and minimizes the risk of chip buildup in pockets, because the smaller chips are removed with compressed air or coolant.

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The machines’ oil-based dielectric fluid systems create a smaller spark gap between the electrode and workpiece than standard water-based fluid systems. This facilitates precision machining of narrower slot widths and smaller corner radii in a variety of materials, including hardened metals and polycrystalline diamond (PCD).

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