Johnford ST-70B
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-70B cost?
Price estimate
We do not have a price for the Johnford ST-70B 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
Johnford builds its 1,600 mm B-spindle lathe on three frames, and the Johnford ST-70B is the smallest of them. It swings 790 mm (31.1 in) over the bed and 600 mm (23.6 in) over the cross slide, with 320 mm (12.6 in) of X travel.
The other two are the ST-70BH, with 920 mm (36.2 in) and 700 mm (27.6 in) of swing and 370 mm (14.6 in) of X, and the ST-70BX, with 1,020 mm (40.2 in) and 800 mm (31.5 in) of swing and 420 mm (16.5 in) of X. All three share the spindle, the 1,600 mm (63 in) Z travel and the outside dimensions. What the ST-70B gives up is clearance; what it keeps is the lightest carriage, moved by 4 kW servo motors where the ST-70BH and ST-70BX use 7 kW.
So the choice comes down to part diameter. If the work is shafting that never approaches 600 mm, the larger swing buys nothing. If a wide flange has to clear the cross slide now and then, the H or X frame is the answer.
The spindle is the A2-11 unit: 132.5 mm (5.2 in) bore, 116 mm (4.6 in) bar capacity and 2,000 rpm through four automatic speeds. The tailstock travels 1,300 mm (51.2 in). Weight is 13,200 kg (29,040 lb).
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 790 mm (31.1 in) |
| Swing Over Cross Slide | 600 mm (23.6 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 | 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 | 13,200 kg (29,040 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
- 1,600 mm (63 in) of Z travel with the A2-11 spindle
- Tailstock travel of 1,300 mm (51.2 in)
- Four automatic spindle speeds to 2,000 rpm
- Rapid traverse of 15 m/min on X and 18 m/min on Z
- Optional 30 / 37 kW (40.2 / 49.6 hp) motor
Limitations
- Smallest swing of the three frames with this spindle and length: 600 mm (23.6 in) over the cross slide
- X travel of 320 mm (12.6 in)
- 4 kW X and Z servo motors
- MT#5 tailstock quill of Ø125 mm (4.9 in)
Best For
Frequently Asked Questions
01
Swing and X travel. The ST-70B swings 600 mm (23.6 in) over the cross slide with 320 mm (12.6 in) of X. The ST-70BH swings 700 mm (27.6 in) with 370 mm (14.6 in) of X. The ST-70BX swings 800 mm (31.5 in) with 420 mm (16.5 in) of X.
02
13,200 kg (29,040 lb). The ST-70BH is listed at 13,300 kg (29,260 lb) and the ST-70BX at 13,400 kg (29,480 lb), so the larger frames add little weight.
03
The B spindle: A2-11 nose, 132.5 mm (5.2 in) bore, 180 mm (7.1 in) bearing diameter and 116 mm (4.6 in) bar capacity, with a 381 mm (15 in) chuck as standard and a 450 mm (17.7 in) chuck as an option.
04
6,482 x 2,290 x 2,765 mm (255.2 x 90.2 x 108.9 in). The bed is inclined at 60° and a chain type chip conveyor with trolley is standard.
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