Johnford ST-70C
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-70C cost?
Price estimate
We do not have a price for the Johnford ST-70C 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 heaviest of the nine small-frame ST lathes is the Johnford ST-70C at 13,250 kg (29,150 lb). It joins the A2-15 spindle and its 510 mm (20.1 in) chuck to 1,600 mm (63 in) of Z travel.
This is as far as the small frame goes, and the tailstock shows it. A part filling the chuck and reaching 1,600 mm (63 in) down the bed can be heavy, yet the quill supporting it is Ø125 mm (4.9 in) with an MT#5 taper and 125 mm (4.9 in) of travel. The next model up, the ST-80C, has a Ø200 mm (7.9 in) quill with MT#7, 2,000 mm (78.7 in) of Z travel and 7 kW axis motors, and weighs 15,300 kg (33,660 lb).
For work that is long but not massive, that hardly matters, and the ST-70C keeps the quicker axes of the small frame: 15 m/min on X and 18 m/min on Z.
The drive is 30 / 37 kW (40.2 / 49.6 hp), or 37 / 45 kW (49.6 / 60.3 hp) as an option, through four automatic speeds. Belt-type gearbox speed is 1,500 rpm as standard; the geared headstock gives 1,200 rpm. Bore is 152 mm (6 in), bar capacity 139 mm (5.5 in), and the tailstock travels 1,300 mm (51.2 in).
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 790 mm (31.1 in) |
| Swing Over Cross Slide | 600 mm (23.6 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 | 320 mm (12.6 in) |
| Y Axis Travel Optional | ±75 mm (±3 in) |
| Z Axis Travel | 1,600 mm (63 in) |
| Rapid Traverse Rate | X: 15 m/min (591 ipm); Y: 10 m/min (394 ipm); Z: 18 m/min (709 ipm) |
| Tailstock Travel | 1,300 mm (51.2 in) |
| Tailstock Quill Travel | 125 mm (4.9 in) |
| Tailstock Quill Diameter | Ø125 mm (Ø4.9 in) |
| Tailstock Taper | MT#5 |
| Servo Motor X | 4 kW |
| Servo Motor Y Optional | 3 kW |
| Servo Motor Z | 4 kW |
| Bed Inclination | 60° |
| Machine Weight | 13,250 kg (29,150 lb) |
| Machine Dimensions | 6,482 x 2,290 x 2,765 mm (255.2 x 90.2 x 108.9 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 510 mm (20.1 in) chuck with 1,600 mm (63 in) of Z travel
- Up to 37 / 45 kW (49.6 / 60.3 hp) as an option
- Faster rapids than the long ST beds: 15 m/min on X, 18 m/min on Z
- 139 mm (5.5 in) bar capacity
- Tailstock travel of 1,300 mm (51.2 in)
Limitations
- Ø125 mm (4.9 in) MT#5 tailstock quill on a machine with a 510 mm (20.1 in) chuck
- 4 kW X and Z servo motors
- Swing over the cross slide of 600 mm (23.6 in)
- Speed limited to 1,500 rpm
Best For
Frequently Asked Questions
01
When the part is heavy or longer than 1,600 mm (63 in). The ST-80C has 2,000 mm (78.7 in) of Z travel, a Ø200 mm (7.9 in) tailstock quill with MT#7 taper, 7 kW X and Z servo motors and 700 mm (27.6 in) of swing over the cross slide.
02
A2-15 nose, 152 mm (6 in) bore, 200 mm (7.9 in) bearing diameter, four automatic speeds, 1,500 rpm with the standard belt-type gearbox and 30 / 37 kW (40.2 / 49.6 hp).
03
13,250 kg (29,150 lb), the most of the small-frame ST lathes. Outside dimensions are 6,482 x 2,290 x 2,765 mm (255.2 x 90.2 x 108.9 in).
04
Manual or hydraulic self-centering steady rests, a sub-spindle or counter-spindle in replacement of the tailstock, and a boring bar holder on the turret carriage or an independent boring bar system are all on the optional accessory list.
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