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Turning center turns to multi-tasking.

Turning center turns to multi-tasking

The Super Quick Turn (SQT) series of turning centers is a major step toward "lights-out manufacturing" for job shops of all sizes, says Mazak Corp, Florence, KY. Three configurations are available, the SQT-15M, SQT-15MS, and SQT-15MS-GL100.

The Super Quick Turn 15MS with gantry robotic part-load system (GL100) can operate untended during lunch hours, operator breaks, or shift changes and outperform a more traditional machining package comprising a CNC two-axis turning center and a three-axis vertical machining center.

"Systems-like" capability of the new SQT series is attributable to standard accessories including a quick-change turret-mounted milling/drilling toolholder and a main spindle with C-axis programming capability (0.001 deg) for secondary operations. Pre-engineered support options include a second spindle with 72-position indexing, a gantry-robot part-loading system, and a bar-feeding system.

Integral spindle/motor construction provides quick response with top spindle speed of 4000 rpm reached in 2.5 sec.

The SQT machine may be used as a CNC barfeed automatic or an auto load/unload shaft-turning or chucking machine. In either case, milling, drilling, and automatic second-end machining may be incorporated.

To illustrate the capability of the SQT-15MS-GL100 (price: $219,470), a typical chucker part was machined on it and on a traditional system comprising a CNC two-axis turning center (Mazak's Quick Turn 15N--$94,100) and a three-axis vertical machining center (Mazak's VTC-41--$75,000).

The part selected was approximately 4" dia by 4" long with a key-way on the OD, four tapped holes on a 2" bolt circle on the front face, and a locator hole on the opposite face. All details must be held in relation to each other.

In the traditional system, turning takes two setups, and drilling, tapping, and milling take three more in the machining center for a total of five setups and ten part handlings. The Mazak SQT-15MS completes this machining in one loading--one setup--since the part is internally transferred to the second spindle for second-side turning. Shifting from turning mode to milling takes 3.5 sec vs 20 sec in conventional C-axis construction.

Drilling, tapping, and milling are achieved by programming the C-axis main and indexing second spindles and the turret-mounted secondary-operation mill/drill holders. Turning tools can be mounted on all of the turret's 12 faces.

Overall cost savings on production runs of 30 parts are said to be close to 50%. Benefits of the system, says Mazak, include gains in work-in-process inventory because no parts accumulate on the SQT between first and second operations, unlike the conventional system. In addition, each loading of a part results in a completed workpiece vs conventional machines which require five part loadings to get a completed workpiece.

No operator intervention is required to change the part between operations, freeing operators for other assignments. Accuracy is improved because all operations are accomplished without removing the part from the machine; including secondary operations machined in relation to part centerline without refixturing.

For more information on the Mazak SQT series, circle 245.

The productivity winner
Configuration 2-Axis CNC Turning 3-Axis CNC Turning
 plus with
 3-Axis Machining Milling/Drilling
 Center capability
 Second Spindle with
 Gantry Robot
Model Quick Turn 15N SQT-15MS-GL 100

 1st Part 17 HRS. 8 MIN. 5 HRS. 40 MIN.
 30 Parts 20 HRS. 53 MIN. 8 HRS. 48 MIN.
Capital investment 100% 140%
Flexibility 10 9
Production rate 3 8
Operator attention* 1 9
In-process inventory* 3 10
Floor 2 8

Queue time 4 10
Overall productivity 23 54

*Zero = 10
COPYRIGHT 1992 Nelson Publishing
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1992 Gale, Cengage Learning. All rights reserved.

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Title Annotation:Product News
Publication:Tooling & Production
Date:Jan 1, 1992
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