Johnford ST-240BX
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-240BX cost?
Price estimate
We do not have a price for the Johnford ST-240BX that we can stand behind, so we show no number. Configuration, options and installation move the final price a long way: a quote is the reliable figure.
Overview
The Johnford ST-240BX offers the largest working envelope of any B-spindle ST lathe: 6,050 mm (238.2 in) of Z travel, 1,200 mm (47.2 in) of swing over the bed and 1,000 mm (39.4 in) over the cross slide.
It is an unusual specification. The envelope is that of a heavy roll lathe, but the spindle is the A2-11 unit with a 381 mm (15 in) chuck and 22 / 26 kW (29.5 / 34.9 hp), running to 2,000 rpm. The parts that match it are long and wide without being heavy: large-diameter thin tubes, composite or fabricated rolls, long light structures that need journals and faces turned true.
For such parts the support along the bed matters more than the headstock. The tailstock travels 5,400 mm (212.6 in) with a Ø200 mm (7.9 in) MT#7 quill, and manual or hydraulic self-centering steady rests are optional.
The machine weighs 32,300 kg (71,060 lb) and measures 11,667 x 2,950 x 3,258 mm (459.3 x 116.1 x 128.3 in). X travel is 520 mm (20.5 in), and the 30 / 37 kW (40.2 / 49.6 hp) motor is available. Bore is 132.5 mm (5.2 in), with 116 mm (4.6 in) of bar capacity.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 1,200 mm (47.2 in) |
| Swing Over Cross Slide | 1,000 mm (39.4 in) |
| Chuck Size | 381 mm (15 in) |
| Chuck Size Optional | 450 mm (17.7 in) |
| Bar Capacity | 116 mm (4.6 in) |
| Spindle Nose | A2-11 |
| Spindle Bore | 132.5 mm (5.2 in) |
| Spindle Transmission | Auto 4 speeds |
| Max Spindle Speed | 2,000 rpm |
| Spindle Motor Power | 22 / 26 kW (29.5 / 34.9 hp) (Std.); 30 / 37 kW (40.2 / 49.6 hp) (Opt.) |
| Spindle Bearing Diameter | 180 mm (7.1 in) |
| Turret Stations | 12 |
| X Axis Travel | 520 mm (20.5 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 6,050 mm (238.2 in) |
| Rapid Traverse Rate | X: 10 m/min (394 ipm); Y: 10 m/min (394 ipm); Z: 12 m/min (472 ipm) |
| Tailstock Travel | 5,400 mm (212.6 in) |
| Tailstock Quill Travel | 150 mm (5.9 in) |
| Tailstock Quill Diameter | Ø200 mm (Ø7.9 in) |
| Tailstock Taper | MT#7 |
| Servo Motor X | 7 kW |
| Servo Motor Y Optional | 3 kW |
| Servo Motor Z | 7 kW |
| Bed Inclination | 60° |
| Machine Weight | 32,300 kg (71,060 lb) |
| Machine Dimensions | 11,667 x 2,950 x 3,258 mm (459.3 x 116.1 x 128.3 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 6,050 mm (238.2 in) of Z travel under 1,200 mm (47.2 in) of swing
- 2,000 rpm, the highest speed on this frame
- 520 mm (20.5 in) of X travel
- Tailstock travel of 5,400 mm (212.6 in)
- Steady rests available as options
Limitations
- 381 mm (15 in) chuck and 22 / 26 kW (29.5 / 34.9 hp) on a very large frame
- 11,667 x 2,950 mm (459.3 x 116.1 in) of floor
- Machine weight of 32,300 kg (71,060 lb)
- 116 mm (4.6 in) bar capacity
Best For
Frequently Asked Questions
01
Z travel 6,050 mm (238.2 in), X travel 520 mm (20.5 in), swing over the bed 1,200 mm (47.2 in) and over the cross slide 1,000 mm (39.4 in).
02
03
32,300 kg (71,060 lb), with outside dimensions of 11,667 x 2,950 x 3,258 mm (459.3 x 116.1 x 128.3 in) and a 60° slant bed.
04
A programmable hydraulic tailstock with a Ø200 mm (7.9 in) MT#7 quill and 5,400 mm (212.6 in) of travel. Manual or hydraulic self-centering steady rests can be ordered.
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