Johnford ST-40BX
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-40BX cost?
Price estimate
We do not have a price for the Johnford ST-40BX 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-40BX is a facing lathe in all but name. It swings 1,020 mm (40.2 in) over the bed and 800 mm (31.5 in) over the cross slide, has 420 mm (16.5 in) of X travel, and its Z travel is only 800 mm (31.5 in).
With the B spindle the workholding grows to match. A 381 mm (15 in) chuck is standard, a 450 mm (17.7 in) chuck optional, on an A2-11 nose with a 180 mm (7.1 in) bearing diameter. The through-bore is 132.5 mm (5.2 in), so ring-shaped parts can be bored through and bar up to 116 mm (4.6 in) can be fed.
Facing a part from a large radius toward the center asks a lot of the transmission, because constant surface speed means a steadily rising spindle speed. The B spindle has four automatic speeds and tops out at 2,000 rpm. The standard motor is 22 / 26 kW (29.5 / 34.9 hp). For heavier facing cuts the 30 / 37 kW (40.2 / 49.6 hp) option is the one to specify.
Rapid traverse is 12 m/min on X and 16 m/min on Z, with 7 kW servo motors. The machine weighs 11,300 kg (24,860 lb) and is 5,132 mm (202 in) long.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 1,020 mm (40.2 in) |
| Swing Over Cross Slide | 800 mm (31.5 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 | 420 mm (16.5 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 800 mm (31.5 in) |
| Rapid Traverse Rate | X: 12 m/min (472 ipm); Y: 10 m/min (394 ipm); Z: 16 m/min (630 ipm) |
| Tailstock Travel | 500 mm (19.7 in) |
| Tailstock Quill Travel | 125 mm (4.9 in) |
| Tailstock Quill Diameter | Ø125 mm (Ø4.9 in) |
| Tailstock Taper | MT#5 |
| Servo Motor X | 7 kW |
| Servo Motor Y Optional | 3 kW |
| Servo Motor Z | 7 kW |
| Bed Inclination | 60° |
| Machine Weight | 11,300 kg (24,860 lb) |
| Machine Dimensions | 5,132 x 2,270 x 2,765 mm (202 x 89.4 x 108.9 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 800 mm (31.5 in) swing over the cross slide with 420 mm (16.5 in) of X travel
- A2-11 spindle on a 180 mm (7.1 in) bearing
- Four automatic speeds to 2,000 rpm
- 30 / 37 kW (40.2 / 49.6 hp) available
- 132.5 mm (5.2 in) through-bore
Limitations
- 800 mm (31.5 in) of Z travel
- Largest listed chuck is 450 mm (17.7 in)
- Standard motor of 22 / 26 kW (29.5 / 34.9 hp)
- Tailstock travel of 500 mm (19.7 in)
Best For
Frequently Asked Questions
01
1,020 mm (40.2 in) over the bed and 800 mm (31.5 in) over the cross slide. X travel is 420 mm (16.5 in) and Z travel 800 mm (31.5 in).
02
381 mm (15 in) as standard and 450 mm (17.7 in) as an option. The standard chuck is a 3-jaw hydraulic through-hole type with one set of hard and soft jaws.
03
The ST-40CX has the A2-15 spindle: a 510 mm (20.1 in) chuck, a 152 mm (6 in) bore, 30 / 37 kW (40.2 / 49.6 hp) and 1,500 rpm. The ST-40BX has the A2-11 spindle with 2,000 rpm and weighs 11,300 kg (24,860 lb) against 11,350 kg (24,970 lb).
04
7 kW servo motors on X and Z, with rapid traverse of 12 m/min and 16 m/min. The optional Y axis has a 3 kW motor and ±75 mm (±3 in) of travel.
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