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CNC Jig Grinder Offers Flexibility

The high-performance Mitsui Seiki J350G jig grinder offers a combination of application flexibility, accuracy, reliability and operator-friendly operation, the company reported.

"The machine's grinding infeed stroke is the largest available among competing machines, with a U-axis range of -3 mm to +50 mm relative to the spindle center," said a company spokesperson. This provides the flexibility to grind small and large diameter holes, as well as multiple features, using a single wheel in a continuous, automatic mode.

According to Mitsui Seiki, many legacy jig grinders are currently coming offline in shops, and manufacturers are looking to replace them with those featuring advanced CNC controls. To that end, the J350G's FANUC 31i-B control has a 15" touch panel LCD screen and is preloaded with G-MAPS conversational-style programming software. The control also permits easy manual programming via graphic icons, data entry or conventional methods.

"Jig grinders are the most common machine type in small shops and large factories. Our CNC J350G provides the ability to grind a wide variety of features automatically, without changing wheels," said Bill Malanche, Mitsui Seiki USA COO. "It provides the flexibility required in today's manufacturing environment."

To maximize accuracy, the X- and Y-axes of the J350G are hand scraped and incorporate needle roller bearings. Left and right slide ways are V-F flat shaped, and the Y-axis (spindle head motion) is V-V shaped to maximize positioning accuracy. The machine bed consists of a thick, rigid casting supported by three level points, offering consistent perpendicularity and parallelism. Built-in, custom-designed HEIDENHAIN scales contribute to +/- 0.0007 mm accuracy on the X-, Y- and Z-axes.

Table longitudinal travel (X-axis) is 500 mm, transverse travel (Y-axis) is 300 mm and quill travel (Z-axis) is 100 mm. Maximum distance from the table surface to the grinding spindle nose is 450 mm. The machine's work surface is 700 mm x 350 mm and permissible table load is 300 kg. Table and saddle maximum rapid feed rates are 2,000 mm/min and grinding feedrates are variable from 0.1 mm/min to 2,000 mm/min. The standard high-frequency spindle motor operates from 9,000 RPM to 45,000 RPM. Spindle motor options include an air-turbine motor with 75,000 RPM capability.

The machine's 3 sq. m (2,220 mm x 2,610 mm) footprint is 50% smaller than that of the previous model, maximizing floor space efficiency. A standard total enclosure machine cover permits easy operator access while addressing safety and environmental concerns.

For more information contact:

Mitsui Seiki USA Inc.

563 Commerce Street

Franklin Lakes, NJ 07417


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