Johnford ST-70A
Key Specifications
Max Spindle
Rapid Traverse
Spindle Power
swing over bed
swing over cross slide
chuck size
How much does the Johnford ST-70A cost?
Price estimate
We do not have a price for the Johnford ST-70A 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-70A puts the fast A spindle on the longest bed of the small ST frame: 1,600 mm (63 in) of Z travel with a top speed of 3,000 rpm.
Long and fast is a particular combination. It suits shafts of modest diameter, the kind that fit a 304 mm (12 in) chuck or come from 91 mm (3.6 in) bar, where surface speed needs rpm and the part is long enough to want a tailstock. The tailstock travels 1,300 mm (51.2 in); its quill is Ø125 mm (4.9 in), MT#5, with 125 mm (4.9 in) of stroke.
On slender work the tailstock will not be enough by itself, and the accessory list has manual or hydraulic self-centering steady rests as options. A sub-spindle or counter-spindle in place of the tailstock is another listed option, which turns the machine into a shaft lathe that can finish both ends.
The spindle motor is 22 / 26 kW (29.5 / 34.9 hp) with an Auto Hi-Lo transmission. Swing is 790 mm (31.1 in) over the bed and 600 mm (23.6 in) over the cross slide. At 6,482 x 2,290 mm (255.2 x 90.2 in) the footprint is slightly wider than that of the two shorter A models, and the weight is 13,100 kg (28,820 lb).
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | 790 mm (31.1 in) |
| Swing Over Cross Slide | 600 mm (23.6 in) |
| Chuck Size | 304 mm (12 in) |
| Chuck Size Optional | 381 mm (15 in) |
| Bar Capacity | 91 mm (3.6 in) (Std.); 102 mm (4 in) (Opt.) |
| Spindle Nose | A2-8 / A2-11 (Opt.) |
| Spindle Bore | 115 mm (4.5 in) |
| Spindle Transmission | Auto Hi-Lo |
| Max Spindle Speed | 3,000 rpm for 12 in (91) chuck; 2,800 rpm for 12 in (102) chuck; 2,500 rpm for 15 in (102) chuck |
| Spindle Motor Power | 22 / 26 kW (29.5 / 34.9 hp) |
| Spindle Bearing Diameter | 160 mm (6.3 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 | 13,100 kg (28,820 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 at up to 3,000 rpm
- Tailstock travel of 1,300 mm (51.2 in)
- Steady rests and a sub-spindle are available as options
- Rapid traverse of 18 m/min on Z
- 13,100 kg (28,820 lb) on a 60° slant bed
Limitations
- Bar capacity of 91 mm (3.6 in), 102 mm (4 in) optional
- MT#5 tailstock quill of Ø125 mm (4.9 in) for parts up to 1,600 mm (63 in) long
- Only the 22 / 26 kW (29.5 / 34.9 hp) motor is listed
- Steady rests are not part of the standard machine
Best For
Frequently Asked Questions
01
02
A programmable hydraulic tailstock with rotary quill. The quill is Ø125 mm (4.9 in) in diameter with 125 mm (4.9 in) of travel and an MT#5 taper, and the tailstock travels 1,300 mm (51.2 in).
03
Yes. Manual or hydraulic self-centering steady rests are on the optional accessory list, as are a boring bar holder on the turret carriage and a completely independent boring bar system.
04
6,482 x 2,290 x 2,765 mm (255.2 x 90.2 x 108.9 in), with a machine weight of 13,100 kg (28,820 lb). The bed is inclined at 60°.
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