Johnford SL-100B
Key Specifications
Max Spindle
Spindle Power
swing over bed
swing over cross slide
chuck size
bar capacity
How much does the Johnford SL-100B cost?
Price estimate
We do not have a price for the Johnford SL-100B 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
With 2,500 mm (98.4 in) of Z travel behind an A2-11 spindle, the Johnford SL-100B is built for long hollow parts and heavy rolls. The chuck is 15 in, the bore Ø132.5 mm (Ø5.2 in) and the transmission has 4 steps.
Consider a steel mill or paper mill roll. Its body is wide, its journals much smaller, its length over two metres. Roughing the body is a low-speed, high-torque cut at a diameter near the Ø540 mm (Ø21.3 in) limit over the cross slide; finishing the journals wants more speed. A 4 step gearbox with a 22 / 26 kW (29.5 / 34.9 hp) motor covers both ends up to 2,000 rpm. The SL-100A, limited to a 12 in chuck and 2 steps, is the lighter alternative for slimmer shafts.
The second use is hollow work. Cylinder barrels, long sleeves and bored shafts are held on the outside while a boring bar goes in from the turret. Bar overhang is the limit there, and the X travel of 295 mm (11.6 in) with a 12-position turret allows a long bar to be mounted. Internal work gains from the optional high pressure coolant through the turret.
Tailstock travel is 2,200 mm (86.6 in). The quill is Ø125 mm (Ø4.9 in) with an MT#5 centre, and the rotary quill option is MT#5 too. With the Y-axis, Z travel is 2,400 mm (94.5 in).
The SL-100B weighs 16,000 kg (35,200 lb). Its table length, 6,985 mm (275 in), is nearly the figure printed for the two-metre models and deserves a check against a layout drawing.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Bed | Ø700 mm (Ø27.6 in) |
| Swing Over Cross Slide | Ø540 mm (Ø21.3 in) |
| Chuck Size | 15 in (381 mm) |
| Bar Capacity | Ø116 mm (Ø4.6 in) |
| Spindle Nose | A2-11 |
| Spindle Bore | Ø132.5 mm (Ø5.2 in) |
| Spindle Transmission | 4 step |
| Max Spindle Speed | 2,000 rpm |
| Spindle Motor Power | 22 / 26 kW (29.5 / 34.9 hp) |
| Spindle Bearing Diameter | Ø180 mm (Ø7.1 in) |
| Turret Stations | 12 |
| X Axis Travel | 295 mm (11.6 in) |
| Y Axis Travel | ±50 mm (±2 in) |
| Z Axis Travel | 2,500 mm (98.4 in); 2,400 mm (94.5 in) with Y-axis |
| Tailstock Travel | 2,200 mm (86.6 in); 2,100 mm (82.7 in) with Y-axis |
| Tailstock Quill Travel | 125 mm (4.9 in) |
| Tailstock Quill Diameter | Ø125 mm (Ø4.9 in) |
| Tailstock Taper Fixed | MT#5 |
| Tailstock Taper Rotary | MT#5 (Opt.) |
| Servo Motor X | 3 kW; 4 kW with Y-axis |
| Servo Motor Y | 3.8 kW |
| Servo Motor Z | 4 kW |
| Power Turret Motor | 3.7 / 5.5 kW (5.0 / 7.4 hp) |
| Bed Inclination | 45° |
| Machine Weight | 16,000 kg (35,200 lb) |
| Machine Width Height | 2,430 x 2,510 mm (95.7 x 98.8 in) |
| Machine Length | 6,985 mm (275 in) |
Specifications sourced from johnford.com.tw — verified 2026-10-04
Strengths & Limitations
Strengths
- 2,500 mm (98.4 in) of Z travel with a 15 in chuck and A2-11 nose
- 4 step transmission for torque at low speed, 2,000 rpm at the top
- Ø132.5 mm (Ø5.2 in) bore and Ø116 mm (Ø4.6 in) bar capacity
- 2,200 mm (86.6 in) of tailstock travel, MT#5 fixed and rotary quill
- Ø540 mm (Ø21.3 in) swing over the cross slide
Limitations
- 22 / 26 kW (29.5 / 34.9 hp) is the only motor listed
- Printed length of 6,985 mm (275 in) should be confirmed with the maker
- Steady rests for long rolls are optional
- No usable rapid traverse figure in the maker's table
Best For
Frequently Asked Questions
01
Swing over bed Ø700 mm (Ø27.6 in), swing over cross slide Ø540 mm (Ø21.3 in), 15 in chuck, bar capacity Ø116 mm (Ø4.6 in), Z travel 2,500 mm (98.4 in), X travel 295 mm (11.6 in).
02
Four. The spindle transmission is listed as 4 step with a 22 / 26 kW (29.5 / 34.9 hp) motor and 2,000 rpm maximum. The SL-100A has a 2 step Auto transmission and 3,000 rpm.
03
A programmable hydraulic tailstock is standard for this size, with 2,200 mm (86.6 in) of travel, or 2,100 mm (82.7 in) with the Y-axis. The quill is Ø125 mm (Ø4.9 in) with 125 mm (4.9 in) of stroke and an MT#5 centre.
04
The SL-120B, with 3,000 mm (118.1 in) of Z travel and a machine length of 7,485 mm (294.7 in). The spindle and swing are the same.
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