Multi-Surface Grinder handles complex, precision components.
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Featuring 10 in. Z/X/U axis travels, modular LL2U-MS can be configured as chucker, shoe type centerless, roll type centerless, and center type work (between centers). All linear axes use round hydrostatic way system with 300° of bearing wrap to ensure accurate tracking in all degrees of freedom. In addition to liquid-cooled Fanuc linear motors with 6,000 N thrust, system employs linear glass scales that provide position feedback with resolution of 0.000004 in. on all linear axes.
Original Press Release:
Bryant Grinder Introduces New Multi-Surface Grinder for Complex Precision Components
[SPRINGFIELD, VERMONT - NOVEMBER 2008] Bryant Grinder, a division of Vermont Machine Tool Corporation, has introduced a new modular multi-surface grinding machine with extended flexibility to grind complex workpieces. The machine, designated as LL2U-MS (Universal-Multi-Surface), can be configured as a chucker, shoe type centerless, roll type centerless and center type work (between centers). The machine boosts 10" (255 mm) of Z axis travel, 10" (255 mm) of X axis travel and an optional U axis, also with 10" (255 mm) of travel. All linear axes use the proven Bryant round hydrostatic way system with 300 degrees of bearing wrap to ensure accurate tracking in all degrees of freedom. This machine tool offers "big" machine capacities with a "small" machine footprint.
Configured as a chucker, the machine can swing up to 14" (355 mm) diameter over the table, as a center type, 4.0" (100 mm) diameter by 10" (255 mm) long with a hydraulic tailstock and live centers. The center type configuration may also be outfitted with a chuck and a C axis to grind O.D. non-round workpieces. Workpieces up to 6" (1250 mm) diameter can be ground in shoes (hydrostatic shoes are available for special applications). The machine, "as standard" will allow plus or minus 5 degrees of taper adjustment, configured with the optional B axis, plus or minus 45 degrees is available..
Linear glass scales provide position feedback with resolution of 0.000004" (.0001 mm) on all linear axis. Linear prime movers are Fanuc linear motors with 6,000 N thrust positioned in the same plane as the linear way system. The motors are liquid cooled to optimize motor performance and minimize the heat transfer to other machine components.
The workhead rotary axis is powered by either a Fanuc servo motor or a Fanuc synchronous built-in Dis servo torque motor with a high accuracy rotary encoder. Both applications use direct drive to maximize the relationship with other CNC axes to ensure geometric accuracy on non-round grinding applications.
The base is cast in granite epoxy and includes a thermal stability system with thermocouples strategically placed within the base to monitor temperature. With the optional thermal control system, the sensors provide feedback to the Fanuc 30 series control and Bryant's Revelations® software to control the base temperature by heating or cooling as required.
Replacing the standard bridge with an extended bridge and workhead option offers processing opportunities for long awkward parts with bore depths or O.D. surfaces up to 11.0". With the standard bridge/workhead or the extended version the Fanuc Dis direct drive workhead offers coupled C axis accuracy to non-round applications. With the U axis, stacked X and Z axes and multiple wheel head configuration the LL2U-MS becomes a bore, face, seat grinder for fuel management applications.
As with all Bryant's machine tools, a full range of standard and special support products are available including High Precision Workheads, High Frequency Dressers, Roll Dressers, Radius Dressers and Generation II high torque wheelheads from 5,000 to 165,000 RPM. with built-in sensors for adaptive gap, dress, and grind.
The accuracy of the thermally stable base, the proven Bryant hydrostatic way system combined with high acceleration linear motors, 0.000004" glass scale accuracy, all under control by a Fanuc 30 Series Control and Bryant's Revelations® Software make this machine an ideal platform for aerospace, bearing manufacture, automotive, medical, fuel management and job shop manufacturing applications.
For more information about the grinding performance of the new LL2U-MS and other Bryant machine tools and accessories, contact Mr. George Nelson at 802-885-5161.
Gorman Communications, LLC
PO Box 207
Watertown, CT 06795
Phone/Fax: (860) 417-6126
Mobile: (860) 483-0444
