GS-280M - Ultra Performance Turning Center

Chuck Size / Bar Capacity : 8" / 2.00"

Max. Turning Diameter x Length : 15.74" x 24.17"

Spindle : A2-6 Taper

Spindle Motor : 20 HP ( 30min. ), High Torque, 2-Speed

Turret : 12-Station Servo Indexing ( 1" OD Tooling )

Bed Type : 30° Slant Bed

Guide Way Type : Harden & Ground Box Ways

X / Z Axes Rapids : 788 / 945 IPM

Sub-Spindle : N / A

Live Tooling : N / A

Standard & Optional Features

Above standard & optional features also apply to L models.*1 For M (power turret) models only.*2 For S (sup-spindle) models only.*3 Standard with tailstock option.*4 For comparison only.*5 FANUC 31i control option must be selected for M & S models.*6 Please contact YAMA SEIKI for complete control specification list.*7 Alpha i P type spindle motors on all GS-200 series models.

Ultra Performance Turning Center

Packed with industry leading technology and top quality components, the YAMA SEIKI GS-200 series turning centers combine incredible power, strength, and speed to bring you The Ultimate Machining Power®. These powerful ultra performance machines will easily accomplish the demanding turning applications of today and tomorrow. 2 bed lengths ( utilizing the same advanced design ) and 3 spindle sizes offer a total of 6 basic model configurations to suit your application. Furthermore, with available live tooling, C-axis, Y-axis, and sub-spindle capabilities, milling, drilling, and front / back-end turning applications may be completed in one single machine.

30° true slant-bed design provides smooth chip disposal and easier operator access.

Stainless steel way covers and special steel wipers molded with industrial strength rubber are used for durability.

Fully enclosed splashguards keep chips and coolant contained for a safe clean working environment.

The auto lubrication system delivers metered amounts of lubrication to the slide ways, ball screws, and vital components.

Distribution is automatically shut off during idling to prevent waste.

Maximum Strength Structure

Major structural components have been combined into one solid platform. The low center of gravity 30° slant bed design provides the most rigid foundation possible for the headstock, turret, and tailstock.

By using Finite Element Methods ( FEM ), optimal reinforce ribbings are directly cast into the one-piece bed structure. Mechanical rigidity has been increased by more than 40% when compared to conventional designs. The GS-200 series is capable of performing super heavy-duty turning and maintain long-term super high-precision accuracy. More rigidity also means extended tool life.

Built to endure years and years of rigorous high production turning, the heavily ribbed, one-piece thermally balanced bed and casting components are of FC35-Meehanite casting ( industry standard is FC25~30 ). FC35 grade cast iron is capable of withstanding much greater stress without deforming and provides maximum vibration dampening, which result in a machine that will outlast and outperform the competition.

All spindle and servo motors, including drives, are FANUC alpha i series components to ensure peak machining performance and accuracy.

X and Z axes are driven by over-sized FANUC alpha i series absolute AC servo motors, providing tremendous thrust outputs with faster acceleration and deceleration. Absolute encoder technology saves time and money by eliminating the use of limit switches, thus, eliminating referencing axes to home positions and replacing broken limit switches.

C3 class hardened and precision ground ball screws ensure the highest accuracy and durability possible. Plus, pretension on all axes minimizes thermal distortion.Slide ways are bonded with “ Turcite B ” to eliminate stick-slip, minimize wear and maintain long term accuracy. Rapids are 20 m/min. ( 787 IPM ) on X-axis & 24 m/min. ( 945 IPM ) on Z-axis.Extra wide hardened and ground box ways are directly formed onto the machine bed and saddle during the casting process. They are precision machined and widely spaced for maximum strength. The box way design also provides the rigidity needed for heavy duty and interrupted turning applications.

Contact surfaces of all slides, headstock, turret, tailstock, and ball screw bearing housings with the machine bed are precision hand scraped to provide maximum assembly precision, structural rigidity, and load distribution.

Ultimate Turning Power

The heavy-duty headstock is of one-piece casting reinforced with heat dispensing fins.

P4 grade ( Class 7 ) super-high precision bearings are directly assembled for maximum level of support and precision. Bearing configuration is designed for super heavy-duty cutting with ultra-smooth performance and long term durability with a higher level of accuracy.

The precision direct belt drive system provides greater spindle control, flexibility and serviceability. Pulley ratios fine tune the motor’s maximum RPM to match the spindle’s maximum RPM, which result in full output at the lowest RPM possible. Thus, utilizing the full potential of the spindle motor for maximum cutting power.

Standard spindle orientation feature allows the spindle to stop at desired programmed position. Useful in broaching and manual part loading applications where a fixed spindle position is required.

Standard rigid tapping feature provides high-speed precision tapping without the use of floating tap holders. Set-up is easier and depth of thread more accurate, permitting maximum productivity for tapping operations.

Generating twice the torque output of standard motors, the A/C, constant output, wide-range FANUC αP22 high-torque i series motor is rated at 18.5 kW ( 25 HP, Peak ). This doublewound motor is designed to reach full output at 1/2 the RPM of standard motors, providing the ability to take heavier cuts in the lower RPM ranges.

Available 2-speed motor configuration further increases the spindle’s cutting ability and flexibility. In low range, the motor reaches full output at 1/3 the RPM of standard motors, and torque output is approximately 3 times more. This system offers the advantages of a gear box without the noise, hassle of maintenance, slow gear change, and expensive rebuilds when a gear box wears out.

Advanced Turret Technology

The super heavy-duty servo indexing turret features the newest non-lifting turret disk technology. Achieving 0.2 second indexing times for adjacent stations and 0.5 second for stations at the opposite end of the disk. Index movements are single step, without pauses, no matter how many stations are skipped.220mm ( 8.66” ) diameter super high precision 3-piece curvic couplings accurately position the turret disk and 4,000 kg ( 8,800 Ibs. ) of clamping force ensures abundant turret rigidity for all cutting conditions.The standard 12-station turret clears 8” diameter work holding devices without interference, even when loaded with tooling at maximum shank size.

Powerful Live Tooling Turrets ( For M Modle )

Live tooling and C-axis control capabilities on the GS-200 series allows the machine to perform multiple tasks on a work piece, such as turning, milling, drilling and tapping. This eliminates manpower and cycle time, while reducing accuracy lost, which will occur if the part is moved from machine to machine.The 12-station YAMA SEIKI live tooling turret offers 12 stations available for live tooling ( live tooling tools rotate in working position only ) and features a non-lifting turret disk.

YAMA SEIKI’s live tooling turret utilizes advance servo indexing technology to achieve 0.2 second indexing times for adjacent stations and 0.5 second for stations at the opposite end of the disk.With the latest technology, live tooling is driven by an AC servo motor to provide ample power, in the form of torque. Now, even the toughest of jobs may be tackled without a sweat.

Ultimate C-axis Spindle

The Cf-axis and disk brake system available on the GS-200 series provides the most rigid and powerful type of C-axis on the market today. In Cf-axis mode, a servo motor is engaged and drives the rotation of the spindle; engagement time is approximately 1 second.Working with the live tooling turret, the Cf-axis and disk brake system enables the machine to perform multiple tasks, such as drilling, tapping, and milling operations, including cylindrical and polar coordinateinterpolations ( resembling a 4th-axis rotary table on a machining center ).With the FANUC servo motor generating an ultra high resolution of 120 million pulses per spindle rotation and 240 Nm ( 176 ft-lb ) of torque ( cont. ), machined surface finishes are much superior than Cs-axis (driven by spindle motor) equipped machines. Plus, dynamic accuracy is within ±0.02° even under heavy cutting loads.

Y-axis Machining Capability ( For Y Modle )

Y-axis control further enhances multi-tasking live tooling capabilities and improves various machining precision. High precision grooving and X-axis off-center drilling are enabled.

With an abundant amount of Y-axis travel, 120 mm= + 65 mm / -55 mm ( 4.72” = + 2.56” / - 2.16" ), a wide variety of parts may be efficiently machined.

On Y-axis equipped machines, the turret is mounted on a secondary 30 degrees wedge saddle on top of the X-axis slide. Both X & Y axes have extra wide hardened and ground box ways, which are directly formed onto the saddles during the casting process. They are precision machined and widely spaced for maximum strength.

Grooving with Y-axis control produces grooves with higher accuracy.

Back-end Machining Capability ( For S Modle )

A 6” chuck size sub-spindle driven by a powerful 11 kW (15 HP, Peak) built-in type FANUC motor (Integrated Motor) for back-end machining is available on the GS-200 series.

The sub-spindle travels on the B-axis, which has extra wide hardened and ground box ways. The box ways are directly formed onto the machine bed during the casting process. They are precision machined and widely spaced for maximum strength.

Automatic part transfer of work piece from main spindle to sub-spindle saves manpower and cycle time, while reducing accuracy lost, which will occur if manually handling the part from machine to machine.

With Ø 38 mm ( 1.50" ) bar capacity, the sub-spindle configuration is also ideal for machining long work pieces such as small diameter shafts. Both ends of the work piece can be supported by the main and sub spindles, allowing the middle section(s) to be accurately machined.

High Speed Control Technology

YAMA SEIKI utilizes the latest in control technology, the FANUC Oi-TD, as the standard control for the GS-200 series. This control provides many features as standard that are not available or costly options found on other controls.

User-friendly control panel allows direct operator access to most of the machine’s setup functions without the hassle of flipping through pages in the control screen. High-grade push buttons and toggle switches are used to ensure durability. The control panel and housing is coolant, oil, and dirt resistant.

Standard 8.4" color LCD screen, small full keypad, graphic display, 640M of program memory, and superfast processor ( Same processor as the 31i ).

Features such as rigid tapping, multiple repetitive cycles, direct programming, custom macro B are standard plus many more.

Standard Manual Guide Oi conversational programming simplifies programming, and advanced canned cycles for complex machining can be carried out automatically. Even inexperienced users can make a part program easily.

Optional control: FANUC 31i with 10.4” color LCD screen, full keypad, and Manual Guide i ( Same drives & motors as the Oi-TD ).Manual Guide i provides conversational programming for live tooling and C-axis applications.