The SA(XII) series of Nexturn Swiss CNC lathes consists of five models with or without rotary synchronous guide bushings. An optional continuous swiveling 135˚ B-axis permits variable angle machining up to 10 front and 8 back-side live tools. Use of guide bushings permits turning of longer parts, while machines without guide bushings are ideal for processing short parts and cold drawn material.
The machines feature up to 8 axes and up to 29 total tools, increasing to 9 axes with the B-axis. Maximum bar diameter capacity of the main and sub spindles is 20mm – 51mm, depending on machine size. Maximum turning lengths are 118 mm – 275mm.
Main and sub spindles provide as much as 20 HP (15kW) at speeds as high as 8,000 RPM while offering full C-axis capability. The synchronous sub-spindle permits simultaneous front and back working. Live tools provide 1.3 HP (1 kW) – 3 HP (3.3 kW) and 6,000 RPM. Rigid tapping is standard.
Excellent rigidity results from the use of FEA technology in machine structure design. The slant-bed machines maximize ease of use with ergonomically arranged controls and fully opening covers and doors.
Nexturn SA(XII) 9-Axis with Opt. B-Axis Swiss Lathe Series
FANUC OiTF (31iT-B5 with B axis opt.) CONTROL, DUAL PATH CONTROL
SIMULTANEOUS MAIN & SUB SPINDLE CONTROL
AC SERVO AXES CONTROL
FULL STROKE SYNCHRONOUS TYPE ROTARY-GUIDE BUSHING
MPG PROGRAM CHECK
CROSS DRILL / MILL UNIT ( 8 TOTAL – 4 MODULAR), SPEED 200 – 6,000
MAIN SPINDLE, RIGID SPINDLE POSITIONING (0.001
SUB SPINDLE, RIGID SPINDLE POSITIONING (0.001
MAIN SPINDLE, PNEUMATIC BRAKE
SUB SPINDLE, PNEUMATIC BRAKE
AIR BLOW BY M-CODE
PART CONVEYOR WITH STOCKER BASE
MAIN SPINDLE COLLET CHUCK ADAPTOR FOR TF37
SUB SPINDLE COLLET CHUCK ADAPTOR FOR TF37
GUIDE BUSHING ADAPTOR FOR TD32S
TWO FRONT-END FACE DRILLING STATION (TWO FIXED)
FOUR BACK-END FACE DRILLING STATION (2 LIVE, 2 FIXED)
SEVEN POSITION OD TURNING HOLDER (16mmx16mm)
LEVELING BOLTS AND PADS
SET OF SERVICE TOOLS
SERVICE TOOL BOX
TOOL SETTING GAGE
3 COLOR STATUS LIGHT TOWER
CENTRALIZED LUBE SYSTEM
CUTTING OIL TANK
CUTTING OIL FLOW DETECTOR
MACHINE ACCURACY TEST CHART
ONE COMPLETE SET OF FANUC MANUALS (ENGLISH)
ONE SET OF NEXTURN MANUAL (ENGLISH)
B axis unit with Fanuc 31iT-B5 five axis simultaneous control
No Guide Bushing
Stationary type guide bush
High Pressure Single Port Coolant Unit 300 PSI
MP Systems V2-S08 2000 PSI, 5 GPM, 8 port HPC unit with line kit, installed at AMT
MP Systems V2-H08 2000 PSI, 5 GPM, 8 port HPC unit with line kit & heat exchanger
Fire Trace fire suppression system
Additional off-center drill unit
Chip conveyor (Turbo)
Cut-off detection unit
Long shaft discharge unit
Back Tool Unit (4 live modular + 4 fixed)
Front End Face Live Tool Unit (2 live)
Drill Front-End Face Holder (additional)
Drill Back-End Face Holder (additional)
Thread whirling unit (WTO)
440 / 460 / 480 Volt operation
Mist Buster 850 machine mounted oil smoke and mist collector with HEPA filter
How does a CNC Swiss machine work?
As the turning process begins on a CNC Swiss machine, the main spindle unchucks the workpiece, giving the operator the amount of stroke needed based on the length of the part. The guide bushing continues to feed material into the tooling to create the desired features. The close geometry construction of the machine allows the tool to work within millimeters of the workpiece, reducing chip-to-chip time to a second or less. Using a guide bushing allows a tool to take a heavier depth of cut on the part itself without jeopardizing tolerances. Then, the machine performs a pick off process with the sub-spindle side. If there are any secondary operations to be done on the back of the part, this can be achieved here at the sub. The part is then dropped into a conveyor, which ejects it out the front of the sub.
What is a guide bushing?
The rotary guide bushing, originally called an anti-friction guide bushing, was patented in 1963 to hold various diameters of bar stock for automatic screw machines. The guide bushing rotates the workpiece and pushes it into and out of the cutting tool. It was found to be particularly adaptable for use in a Swiss-type automatic screw machine, which are generally provided with a headstock movable axially to the machine frame while rotating the bar stock. Having an adjustable bushing allows for turning bar stock rigidly and close to the turning tools, which makes it possible to machine parts with high quality finishes and extreme accuracies. A rotary guide bushing rotates with the workpiece and is ideal for turning wider parts, with tolerances greater than +/-0.0005”. Fixed guide bushings remain stationary while the bar stock spins and are ideal for parts that require tighter tolerances.
How many axes does a Swiss lathe have?
While the number of axes can vary depending on the options, most conventional Swiss lathes have 7-9 axes. For instance, the Nexturn SA(XII) series feature up to 8 axes and up to 29 total tools, increasing to 9 axes with the B-axis.