Johnford SL-40
Image: johnford.com.tw, Johnford
Key Specifications
Max Spindle
Spindle Power
swing over bed
swing over cross slide
chuck size
bar capacity
How much does the Johnford SL-40 cost?
Price estimate
We do not have a price for the Johnford SL-40 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 SL-40 opens the medium-sized SL series with a 10 in chuck, Ø76.5 mm (Ø3 in) bar capacity and a swing of Ø580 mm (Ø22.8 in) over the bed. At 4,000 rpm it is the fastest spindle of the medium group.
It is also the lightest, and the table shows why. The SL-40 keeps the construction of the small models: a saddle inclined at 30°, a one step transmission, an 11 / 15 kW (14.8 / 20.1 hp) motor, a Ø60 mm (Ø2.4 in) tailstock quill with an MT#4 centre. Its outer dimensions, 1,851 x 1,862 mm (72.9 x 73.3 in) by 3,525 mm (138.8 in) long, are those of the SL-30. From the SL-50 upward Johnford changes to a 45° bed, a 2 step gearbox and a larger tailstock.
So the SL-40 is a large-swing, light-duty machine. It suits parts that are big in diameter but are not cut hard: aluminium housings, thin-walled rings, plastic and bronze parts, finishing work on pre-machined steel. A shop that wants to rough alloy steel at the full diameter of a 10 in chuck is better served by the SL-50 and its 15 / 18.5 kW (20.1 / 24.8 hp) geared drive.
Z travel is 600 mm (23.6 in), or 500 mm (19.7 in) when the Y-axis is fitted, and X travel is 240 mm (9.4 in). Rapids are 20 / 10 / 20 m/min (787 / 394 / 787 ipm), quicker than the heavier medium models. The machine weighs 4,500 kg (9,900 lb).
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | Ø580 mm (Ø22.8 in) |
| Swing Over Cross Slide | Ø450 mm (Ø17.7 in) |
| Chuck Size | 10 in (254 mm) |
| Bar Capacity | Ø76.5 mm (Ø3 in) |
| Spindle Nose | A2-8 |
| Spindle Bore | Ø86 mm (Ø3.4 in) |
| Spindle Transmission | One step |
| Max Spindle Speed | 4,000 rpm |
| Spindle Motor Power | 11 / 15 kW (14.8 / 20.1 hp) |
| Spindle Bearing Diameter | Ø120 mm (Ø4.7 in) |
| Turret Stations | 12 |
| X Axis Travel | 240 mm (9.4 in) |
| Y Axis Travel | ±40 mm (±1.6 in) |
| Z Axis Travel | 600 mm (23.6 in); 500 mm (19.7 in) with Y-axis |
| Rapid Traverse Xyz | 20 / 10 / 20 m/min (787 / 394 / 787 ipm) |
| Tailstock Travel | 500 mm (19.7 in); 400 mm (15.7 in) with Y-axis |
| Tailstock Quill Travel | 60 mm (2.4 in) |
| Tailstock Quill Diameter | Ø60 mm (Ø2.4 in) |
| Tailstock Taper Fixed | MT#4 |
| Tailstock Taper Rotary | MT#3 (Opt.) |
| Servo Motor X | 1.6 kW |
| Servo Motor Y | 1.6 kW |
| Servo Motor Z | 1.6 kW |
| Power Turret Motor | 3.7 / 5.5 kW (5.0 / 7.4 hp) |
| Saddle Inclination | 30° |
| Machine Weight | 4,500 kg (9,900 lb) |
| Machine Width Height | 1,851 x 1,862 mm (72.9 x 73.3 in) |
| Machine Length | 3,525 mm (138.8 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 10 in chuck and Ø76.5 mm (Ø3 in) bar capacity in a 4,500 kg (9,900 lb) machine
- 4,000 rpm spindle, the highest speed in the medium-sized SL series
- Rapid traverse of 20 / 10 / 20 m/min (787 / 394 / 787 ipm)
- Swing over cross slide of Ø450 mm (Ø17.7 in)
- Footprint of the smaller SL-30: 3,525 mm (138.8 in) long
Limitations
- One step transmission with 11 / 15 kW (14.8 / 20.1 hp); the 2-speed belt-type gearbox is an option
- Tailstock quill of Ø60 mm (Ø2.4 in) with only 60 mm (2.4 in) of travel
- Programmable hydraulic tailstock is optional on this size
- Z travel drops to 500 mm (19.7 in) with the Y-axis
Best For
Frequently Asked Questions
01
Swing over bed Ø580 mm (Ø22.8 in), swing over cross slide Ø450 mm (Ø17.7 in), 10 in chuck, X travel 240 mm (9.4 in) and Z travel 600 mm (23.6 in). The machine is 3,525 mm (138.8 in) long and weighs 4,500 kg (9,900 lb).
02
The SL-50 has a 45° bed, a 2 step Auto transmission, a 15 / 18.5 kW (20.1 / 24.8 hp) motor at 3,500 rpm and weighs 6,500 kg (14,300 lb). The SL-40 has a 30° saddle, a one step transmission, 11 / 15 kW (14.8 / 20.1 hp) at 4,000 rpm and weighs 4,500 kg (9,900 lb).
03
Yes: the SL-40L has 1,000 mm (39.4 in) of Z travel and 900 mm (35.4 in) of tailstock travel, is 4,050 mm (159.4 in) long and weighs 5,500 kg (12,100 lb). Spindle and chuck are the same.
04
With options. The table lists a Y-axis travel of ±40 mm (±1.6 in) and a 3.7 / 5.5 kW (5.0 / 7.4 hp) power turret motor, and the accessory list offers a C-axis, a C+Y axis and a live tool turret in BMT or VDI. The standard turret is non-driven.
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