Johnford ST-40CH
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-40CH cost?
Price estimate
We do not have a price for the Johnford ST-40CH 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
On the Johnford ST-40CH the optional 610 mm (24 in) chuck finally has room. Swing over the cross slide is 700 mm (27.6 in), so the carriage passes under a chuck that the plain ST-40C, at 600 mm (23.6 in), cannot clear.
That makes this the short heavy chucker of the ST series in its complete form: an A2-15 spindle with a 152 mm (6 in) bore, a 510 mm (20.1 in) chuck as standard, 920 mm (36.2 in) of swing over the bed and 800 mm (31.5 in) of Z travel. X travel is 370 mm (14.6 in), on a 7 kW servo motor.
Power is 30 / 37 kW (40.2 / 49.6 hp), with 37 / 45 kW (49.6 / 60.3 hp) as the option. The four-speed transmission reaches 1,500 rpm with the belt-type gearbox, 1,400 rpm in the optional version and 1,200 rpm with the geared headstock. For interrupted, heavy cuts on forgings and castings the geared headstock is the alternative to consider.
The bearing diameter is 200 mm (7.9 in) and bar capacity 139 mm (5.5 in). Tailstock travel is 500 mm (19.7 in). The machine weighs 11,250 kg (24,750 lb) on the same 5,132 x 2,270 mm (202 x 89.4 in) footprint as the other 800 mm models.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 920 mm (36.2 in) |
| Swing Over Cross Slide | 700 mm (27.6 in) |
| Chuck Size | 510 mm (20.1 in) |
| Chuck Size Optional | 610 mm (24 in) |
| Bar Capacity | 139 mm (5.5 in) |
| Spindle Nose | A2-15 |
| Spindle Bore | 152 mm (6 in) |
| Spindle Transmission | Auto 4 speeds |
| Max Spindle Speed | 1,500 rpm (Std.); 1,400 rpm (Opt.) |
| Spindle Speed Geared Headstock | 1,200 rpm |
| Spindle Motor Power | 30 / 37 kW (40.2 / 49.6 hp) (Std.); 37 / 45 kW (49.6 / 60.3 hp) (Opt.) |
| Spindle Bearing Diameter | 200 mm (7.9 in) |
| Turret Stations | 12 |
| X Axis Travel | 370 mm (14.6 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 800 mm (31.5 in) |
| Rapid Traverse Rate | X: 15 m/min (591 ipm); Y: 10 m/min (394 ipm); Z: 18 m/min (709 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 | 11,250 kg (24,750 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
- 700 mm (27.6 in) swing over the cross slide clears the 610 mm (24 in) chuck
- 30 / 37 kW (40.2 / 49.6 hp), optionally 37 / 45 kW (49.6 / 60.3 hp)
- 152 mm (6 in) bore and 200 mm (7.9 in) bearing diameter
- 7 kW servo motors on X and Z
- Machine length of 5,132 mm (202 in)
Limitations
- Z travel of 800 mm (31.5 in)
- Spindle speed no higher than 1,500 rpm
- Tailstock quill of Ø125 mm (4.9 in), MT#5
- 11,250 kg (24,750 lb) under a chuck of up to 610 mm (24 in)
Best For
Frequently Asked Questions
01
For clearance and stronger axes. The ST-40C swings 600 mm (23.6 in) over the cross slide and has 4 kW axis motors. The ST-40CH swings 700 mm (27.6 in), which clears the optional 610 mm (24 in) chuck, and has 7 kW motors.
02
1,500 rpm as standard and 1,400 rpm as an option with the belt type gear box, and 1,200 rpm with the geared headstock. The transmission has four automatic speeds.
03
11,250 kg (24,750 lb). The ST-40C is listed at 11,150 kg (24,530 lb) and the ST-40CX, on the next frame up, at 11,350 kg (24,970 lb).
04
370 mm (14.6 in) on X and 800 mm (31.5 in) on Z, with rapids of 15 m/min and 18 m/min. An optional Y axis adds ±75 mm (±3 in).
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