Nexturn SA(XII) 9-Axis with Opt. B-Axis Swiss Lathe Series

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.

Item / Model	SA-20XII	SA-26XII	SA-32XII	SA-45XII	SA-51XII
	Request a Quote	Request a Quote	Request a Quote	Request a Quote	Request a Quote
	FREE TRACER 20 Bar Feeder	FREE TRACER 32V Bar Feeder	FREE TRACER 32V Bar Feeder	FREE TRACER 51V Bar Feeder	FREE TRACER 51V Bar Feeder
Number of Axes	8 / 9 (opt.)	8 / 9 (opt.)	8 / 9 (opt.)	8 / 9 (opt.)	8 / 9 (opt.)
Number of Channels	2	2	2	2	2
Bar Capacity (Front/Rear)	20 mm / 20 mm	26 mm / 26 mm	32 mm / 32 mm	45 mm / 45 mm	51 mm / 51 mm
Max. Turn Length	11″	11″	11″	4.72″	5.9″
Guide Bushing Type	Synchronous	Synchronous	Synchronous	None	None
Main Spindle	5 HP / 10,000 RPM	10 HP / 8,000 RPM	10 HP / 8,000 RPM	20 HP / 6,000 RPM	17.5 HP / 6,000 RPM
Sub Spindle	3 HP / 8,000 RPM	3 HP / 8,000 RPM	3 HP / 8,000 RPM	7.5 HP / 6,000 RPM	20 HP / 6,000 RPM
Max. Turn Length	11″	11″	11″	4.72″	5.9″
Total Tools (with / without B-Axis)	31 / 29	31 / 29	31 / 29	24	22
Fixed Tools (Front/Rear)	11 / 4	11 / 4	11 / 4	9 / 4	10 / 3
Live Tools (Front) with / without B-Axis	12 / 10	12 / 10	12 / 10	7	6
Live Tools (Rear)	4	4	4	4	3
Cross Live Tools	1.3 HP / 6,000 RPM	1.3 HP / 6,000 RPM	1.3 HP / 6,000 RPM	1.3 HP / 6,000 RPM	3 HP / 6,000 RPM
Backend Live Tools	1.3 HP / 6,000 RPM	1.3 HP / 6,000 RPM	1.3 HP / 6,000 RPM	1.3 HP / 6,000 RPM	1.3 HP / 6,000 RPM
B Axis	0 – 135º	0 – 135º	0 – 135º	0 – 135º	0 – 135º
C Axis Contouring	Main / Sub	Main / Sub	Main / Sub	Main / Sub	Main / Sub
CNC Control	FANUC 31iT	FANUC 31iT	FANUC 31iT	FANUC 31iT	FANUC 31iT
Weight	7,920 lbs.	7,920 lbs.	8,140 lbs.	8,800 lbs.	9,240 lbs.

Item / Model

SA-20XII

SA-26XII

SA-32XII

SA-45XII

SA-51XII

FREE TRACER 20
Bar Feeder

FREE TRACER 32V
Bar Feeder

FREE TRACER 51V
Bar Feeder

Number of Axes

8 / 9 (opt.)

Number of Channels

Bar Capacity (Front/Rear)

20 mm / 20 mm

26 mm / 26 mm

32 mm / 32 mm

45 mm / 45 mm

51 mm / 51 mm

Max. Turn Length

11″

4.72″

5.9″

Guide Bushing Type

Synchronous

None

Main Spindle

5 HP / 10,000 RPM

10 HP / 8,000 RPM

20 HP / 6,000 RPM

17.5 HP / 6,000 RPM

Sub Spindle

3 HP / 8,000 RPM

7.5 HP / 6,000 RPM

20 HP / 6,000 RPM

Max. Turn Length

11″

4.72″

5.9″

Total Tools
(with / without B-Axis)

31 / 29

Fixed Tools (Front/Rear)

11 / 4

9 / 4

10 / 3

Live Tools (Front)
with / without B-Axis

12 / 10

Live Tools (Rear)

Cross Live Tools

1.3 HP / 6,000 RPM

3 HP / 6,000 RPM

Backend Live Tools

1.3 HP / 6,000 RPM

B Axis

0 – 135º

C Axis Contouring

Main / Sub

CNC Control

FANUC 31iT

Weight

7,920 lbs.

8,140 lbs.

8,800 lbs.

9,240 lbs.

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.

Nexturn SA(XII) 9-Axis with Opt. B-Axis Swiss Lathe Series

How does a CNC Swiss machine work?

What is a guide bushing?

How many axes does a Swiss lathe have?

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