Star Micronics SA-20R Type B
Key Specifications
max bar capacity
max machining diameter
max machining length
main spindle speed
main spindle power
back spindle speed
How much does the Star Micronics SA-20R Type B cost?
Estimated price range
Our best estimate for a swiss-type lathe in this class — not a quote from Star Micronics. Configuration moves it a long way.
Overview
The Star Micronics SA-20R Type B is listed as a 20 mm (0.787 in) Swiss-type lathe with a B-axis: a range of +/- 120 degrees, 5-axis simultaneous motion including that B-axis, and a 200 mm (7.87 in) maximum machining length. The figures here are the listed ones. They have not been confirmed against a Star page, so check them against the machine's documentation before relying on them.
The B-axis is the reason to look at this machine. With +/- 120 degrees of range a rotating tool can be set to an angle in the program, where a machine without one needs a separate angled holder for each angle. Simultaneous 5-axis motion means the angle can also change during the cut. Together they cover angled holes, chamfers on compound faces and contoured features that a fixed cross-drilling unit cannot reach.
Main and back spindles are both listed at 10,000 RPM. Power is given as two figures per spindle with no duty rating attached: 3.7 / 5.5 kW (5 / 7.4 HP) on the main and 1.5 / 2.2 kW (2 / 3 HP) on the back. The guide bushing row reads yes, with a guide-bushless option, so the machine can be set up for long slender parts or for short parts that do not need the support.
The listed control is a FANUC 32i and the weight is approximately 2,800 kg (6,173 lbs).
Full Specifications
| Parameter | Value |
|---|---|
| Max Bar Capacity | 20 mm (0.787 in) |
| Max Machining Diameter | 20 mm (0.787 in) |
| Max Machining Length | 200 mm (7.87 in) |
| Main Spindle Speed | 10,000 RPM |
| Main Spindle Power | 3.7 / 5.5 kW (5 / 7.4 HP) |
| Back Spindle Speed | 10,000 RPM |
| Back Spindle Power | 1.5 / 2.2 kW (2 / 3 HP) |
| B Axis Range | +/- 120 degrees |
| Number of Axes | 5-axis simultaneous (including B-axis) |
| Lfv Chip Breaking | Available (Star LFV) |
| Guide Bushing | Yes / Guide-bushless option |
| CNC Control | FANUC 32i |
| Machine Weight | Approx. 2,800 kg (6,173 lbs) |
Specifications compiled from manufacturer literature and industry references. Not independently verified against a published spec sheet — confirm with the manufacturer or an authorised dealer before making a purchasing decision.
Strengths & Limitations
Strengths
- B-axis with a listed range of +/- 120 degrees and 5-axis simultaneous motion
- Main and back spindles are both listed at 10,000 RPM
- Guide bushing, with a guide-bushless option listed
- 200 mm (7.87 in) maximum machining length on 20 mm (0.787 in) bar
Limitations
- Bar capacity is 20 mm (0.787 in); the NEW SD-26 Type S takes Ø26 mm (1-1/64 in)
- Back spindle power is 1.5 / 2.2 kW (2 / 3 HP), well below the 3.7 / 5.5 kW of the main spindle
- No tool counts, rapid rates or duty ratings for the power figures are listed
- The figures are listed ones that have not been confirmed against a Star page
Best For
Frequently Asked Questions
01
The listed B-axis range is +/- 120 degrees, and the axis row reads 5-axis simultaneous, including the B-axis. A rotating tool can therefore be tilted to a programmed angle for angled drilling and milling, and the tilt can move together with the other axes for contoured surfaces.
02
Both the main and the back spindle are listed at 10,000 RPM. Main spindle power is listed as 3.7 / 5.5 kW (5 / 7.4 HP) and back spindle power as 1.5 / 2.2 kW (2 / 3 HP). The table does not say which duty rating each of the two figures refers to.
03
The guide bushing row reads yes, with a guide-bushless option. That means the guide bushing is part of the listed machine and running without it is listed as an option, to be confirmed for the particular machine. The table gives no separate machining length for guide-bushless running.
04
Maximum bar capacity and maximum machining diameter are both listed as 20 mm (0.787 in), and maximum machining length as 200 mm (7.87 in). The machine itself is listed at approximately 2,800 kg (6,173 lbs) with a FANUC 32i control.
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