Universal Vertical Thread Grinder for Precision Lead Screw Type Parts

Mitsui Seiki  USA, Inc. (Franklin Lakes, NJ) has developed the world’s first universal vertical thread grinder, offering many important benefits for customers making precision lead screw type parts. The VGE60A High Precision Universal Vertical Thread Grinder won the coveted Grand Prize in Japan’s 43rd Machine Design Awards competition.

According to Tom Dolan, the vice president of Mitsui Seiki, “There’s been a long trend of switching over from hydraulic to electrical power actuation in a variety of important industries such as automotive, aerospace, and robotics. As such, lead and feed screw actuators for electrical power steering, flight control actuators, and automation systems are in increased demand. Along with these market drivers, highly accurate and efficient machining methods for various screws, such as ballscrews, have also been on the rise. Typically, thread grinders have been made the same way for the last 50 years. This new technology changes everything.”

Addressing these market forces, this industry-first universal thread grinder design configuration offers improved accuracy, speed, performance, and multi-functionality over conventional horizontal thread grinder designs.

The VGE60A is categorized as a “universal” machine because different grinding operations can be performed. In addition to thread grinding, the machine can now perform spline, gear, OD, surface, and edge grinding operations in a single setup. This can save customers significant production time while improving overall part accuracy.

Newly designed features such as an automatic grinding wheel changer, automatic wheel guard, a CNC-controlled wheel dresser (to accommodate various shaped wheels) vastly improve productivity. Infinitely programmable grinding wheel tilt angles from +45 deg to -90 deg provide increased grinding application opportunities.The vertical orientation of the work enhances overall precision elimination of workpiece “sag” is the principle contributor to increased precision.

The value of floor space and operator ergonomics are important design influences. The new vertical configuration requires 33 percent less floor space than a similar capacity horizontal grinder, and allows for improved human interface with the complete work zone.

The VGE60A accommodates a maximum grinding length of 600 mm and an overall shaft size of 80 mm diameter (with the largest diameter wheel) and 700 mm long. The machine is compatible with both oil and water-based coolants.

Mitsui Seiki USA, Inc., 563 Commerce Street, Franklin Lakes, NJ 07417, 201-337-1300, Fax: 201-337-3680, info@mitsuiseiki.com, www.mitsuiseiki.com.