GS-4300 - Ultra Performance Turning Center

Max. Swing Diameter : Ø 770 mm ( 30.31" )

Max. Turning Diameter : Ø 620 mm ( 24.41" )

Max. Turning Length : 819 / 1,569 / 2,369 / 3,169 mm

( 32.24" / 61.77" / 93.27" / 124.76" )

Chuck Size : 15" ( 18" ) / 20" ( 24" )

Bar Capacity : Ø 115 / 165 mm ( Ø 4.53" / 6.50" )

Spindle Nose : A2-11 / A2-15

Spindle Motor Output : 30 / 37 kW ( 40 / 50 HP )

X-axis Travel : 500 mm ( 19.7" )

Z-axis Travel : 850 / 1,600 / 2,400 / 3,200 mm

( 33.46" / 62.99" / 94.49" / 125.98" )

X-axis rapids : 24 m/min. ( 945 IPM )

Z-axis rapids : 24 / 24 / 16 / 12 m/min.

( 945 / 945 / 630 / 472 IPM )

Maximum Performance Turning Center

For those seeking a heavy-duty maximum performance turning center that’s packed with the latest technologies, YAMA SEIKI’s GS-4000 series is the perfect answer. These machines offer awesome turning power, 37 kW ( 30min. ) 2-speed gear-head spindles are standard on most models, to easily turn work pieces up to 24" diameter, and to accommodate various work piece lengths, 4 bed sizes offering maximum tuning lengths ranging from 750 ~ 3,000 mm are available. Live tooling, Y-axis and sub-spindle models further increase machining efficiency and accuracy, while reducing man power. Furthermore, YAMA SEIKI machines are always fully loaded with standard features that are either not available or costly options found on other machines. Features such as chip conveyor, programmable base tailstock, turning tool holders are standard plus many more.

Under the covers, you’ll find a 30 degrees slant bed with super wide box ways, and GS-4000 & GS-4300 series equipped with an enormous 2-speed head stock driven by a 37 kW ( 30min. ) FANUC motor.

Extra large Z-axis spindle motors provide the thrust needed to efficiently drill big diameter holes.

Axes rapids are 24 m/min. on X and Z, which are 50 ~100 % faster than the competitor.*¹

GS-4000 series machines feature a standard programmable base and quill tailstock.

Manual mode quill-jog function allows the quill to be inched forward, which makes it easier to insert the center into the center hole.

Movement of the base and quill in auto mode are controlled by M-codes and thrust pressure is manually adjustable.

Z-axis carriage automatically locks onto the tailstock base and moves it to the desired position with precision accuracy.

Super Heavy-duty Construction

The low center of gravity heavy-duty bed and 30° slant bed design provide a super rigid foundation for the headstock, turret, and tailstock. Creating the rigidity needed to perform super heavy-duty turning and maintaining long-term 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 damping, which result in a machine that will outlast and outperform the competition.

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 30% when compared to conventional designs.

C3 class hardened and precision ground ball screws ensure the highest accuracy and durability possible. Plus, pretension on all axes minimizes thermal distortion.

Extra wide hardened and ground box ways are directly formed into 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.

The L3 series Z-axis equipped with independent supporting mechanism prevents long-sized ball screws from deforming and ensures excellent performance for the axial feed and turning accuracy.

Utilizing the latest 3D CAD design software to assist in machine development, and FEM to provide engineering analysis, we are able to create the best designs possible.

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

Ultimate Turning Power

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

The 2-speed super heavy duty gear head incorporates advance mechanical designs. Mated with a 37 kW ( 30min. ) motor to provide tremendous amount of low-end torque to handle heavy material removal on large diameter parts.

Spindle Output

Advanced Turret Technology

Ø 320 mm diameter super high precision CURVIC couplings accurately position the turret disk and 6,400kg of clamping force ensure abundant turret rigidity for all cutting conditions.

The 12-station heavy-duty servo indexing turret achieves 0.3 second indexing times for adjacent stations. Index movements are continues, without pauses, and is capable of turning Ø 268 mm ( Ø 10.5" ) diameter work pieces without interference when using boring tools. The optional 10-station turret even clears up to Ø 331 mm ( Ø 13" ) diameter.

The curvic couplings provide a large contact area and are designed with an auto–clean feature not seen on traditional couplings.

Live Tooling Turret

Live tooling and C-axis control capabilities on the GS-4000 series allows the machine to perform multiple tasks on a work piece, such as turning, milling, drilling and tapping. It eliminates manpower and cycle time, while reducing accuracy lost, which will occur if the part is moved from machine to machine.

The GS-4000 series live tooling turret is driven by a big power 7.5 kW ( 30 min. ) spindle motor and combined with gear box, it provides ultra high power to meet any difficult task in milling, drilling and tapping application.

The 12-station YAMA SEIKI live tooling turret offers 12 stations available for live tooling, live tools rotate in working position only to reduce power loss and heat.

The Cs-axis is adopted with a high-resolution toroid along with a full-closed loop design, to provide excellent positioning accuracy and repeatability.