Large-Part Machining
strictly a niche machined product to one readily produced on multi-tasking, five-axis machining centers. When Production Machine & Tool (Wichita Falls, TX) de- cided to move up to the “mega-part” league of machining, it selected the RT 1250 U rotary-table horizontal boring mill with a powerful milling spindle and contouring head from Fives Giddings & Lewis (Fond du Lac, WI). “We built our business by offering capabilities other shops in our market typically do not, and this acquisition fits our business strategy perfectly,” said Mark McMullen, president of Production Machine & Tool. “There’s nothing else that can match the capability and versatility of this machine for large-part metalcutting. It is the first ‘no compromise’ design that delivers the full reach and power of a boring mill, while integrating a U-axis contouring spindle that uses standard tools with automatic toolchanging,” said McMullen.
“This machine will accommodate parts up to 60,000 lb [27,200 kg], which is 15 times greater than anything we’ve
RT 1250 U rotary-table horizontal mill being built by Fives Giddings & Lewis for Production Machine & Tool (Wichita Falls, TX) will move the company up to the "mega-part" league of machining.
done before, allowing us to tackle the industry’s largest work- pieces, such as blowout preventers, complete fluid ends and pump cases, to name a few examples,” said McMullen. Both spindles on the RT-1250 boring mill are powered by a single 56-kW motor, and the milling spindle’s 1-m Z-axis reach is complemented with 2500-mm W-axis travel in the table.
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“The large parts we are aiming for require about 90% milling and 10% contouring, and the boring mill platform gives us unmatched metal-removal muscle,” said McMullen. “Currently, there is no single-platform solution that can match the milling capability of this machine and still do contouring with an integrated spindle that employs standard tools. In addition, the live bor- ing spindle can use 50-taper tools up to 750-mm long, as well as programmable boring bars. We believe this machine’s unique capabilities will be the wave of the future for large-part machining, cutting the cycle time and improving the quality,” said McMullen. The machine’s contouring head slide stroke allows creation of turned features up to 540-mm diameter without head changing or manual intervention, so complex features can be machined in one setup with reduced cycle time and labor. The contouring head can produce features such as bottle bores,
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ManufacturingEngineeringMedia.com | December 2013
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