Milltronics SL8-II
Image: milltronics.com, Milltronics
Key Specifications
Max Spindle
Spindle Power
Max Turn Length
Accuracy
Repeatability
x axis travel
How much does the Milltronics SL8-II cost?
Price estimate
We do not have a price for the Milltronics SL8-II 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 Milltronics SL8-II is a CNC turning center fitted with an 8 in 3-jaw hydraulic chuck on an A2-6 spindle nose, turning parts up to 14 in (356 mm) in diameter and 21 in (533 mm) long. The spindle runs up to 4,000 rpm with 30/20 hp (22.4/14.9 kW) and 161 lb-ft (218 Nm) of torque.
Swing over the bed is 21.7 in (551 mm) and swing over the cross slide is 11.8 in (300 mm), so long work that has to pass over the cross slide is held to the smaller figure. X travel is 8 in (203 mm). Z travel is 21 in (533 mm), identical to the maximum turning length, which means there is no spare Z beyond the longest part the machine is rated for.
For bar and through-spindle work the limit is the draw tube, 2.54 in (65 mm) in diameter. Shafts are supported by a tailstock with an MT4 quill, 2.28 in (58 mm) in diameter and 3.46 in (88 mm) of travel.
The 12-station turret indexes in both directions and takes 1 in (25 mm) shank tools and boring bars up to 1.5 in (38 mm). Rapids on X and Z are 1,182 ipm (30.0 m/min), and Milltronics lists positioning accuracy of ±0.0002 in (±0.005 mm) with repeatability of 0.0002 in (0.005 mm). The table has no rows for driven tools, a Y axis or a second spindle, so treat this as a two-axis lathe unless Milltronics confirms otherwise.
It weighs 8,885 lb (4,030 kg), measures 142.8 x 88.3 in (3,627 x 2,243 mm) in nominal operating footprint and 83.7 in (2,126 mm) in height, and draws 26 kVA / 64 A from a 208-240 V, 3-phase supply. The operator works from a 15 in LCD colour touch screen.
Full Specifications
| Parameter | Value |
|---|---|
| X Axis Travel | 8 in (203 mm) |
| Z Axis Travel | 21 in (533 mm) |
| Swing Over Bed | 21.7 in (551 mm) |
| Swing Over Cross Slide | 11.8 in (300 mm) |
| Max Turning Diameter | 14 in (356 mm) |
| Max Turning Length | 21 in (533 mm) |
| Spindle Nose | A2-6 |
| Draw Tube Diameter | 2.54 in (65 mm) |
| Max Spindle Speed | 0-4,000 rpm |
| Spindle Motor Power | 30/20 hp (22.4/14.9 kW) |
| Spindle Torque | 161 lb-ft (218 Nm) |
| Tailstock Quill Travel | 3.46 in (88 mm) |
| Tailstock Quill Diameter | 2.28 in (58 mm) |
| Tailstock Quill Taper | MT4 |
| Turret Stations | 12 |
| Turret Tool Size | 1 in (25 mm) |
| Boring Bar Capacity | 1.5 in (38 mm) |
| Turret Indexing | Bi-Directional |
| Rapid Traverse Xz | 1,182 ipm (30.0 m/min) |
| Positioning Accuracy | ±0.0002 in (±0.005 mm) |
| Repeatability | 0.0002 in (0.005 mm) |
| Axis Thrust Force | 1951 lb-ft Peak X, 1951 lb-ft Peak Z |
| Machine Weight | 8,885 lb (4,030 kg) |
| Machine Height | 83.7 in (2,126 mm) |
| Machine Footprint | 142.8 x 88.3 in (3,627 x 2,243 mm) nominal operating (W x D) |
| Power Requirement | 26 kVA / 64 A |
| Voltage Requirement | 208-240 V, 3-phase |
| Chuck Size | 8 in 3-jaw hydraulic chuck |
| Display | 15 in LCD colour touch screen |
Specifications sourced from milltronics.com — verified 2026-09-24
Strengths & Limitations
Strengths
- 30/20 hp (22.4/14.9 kW) and 161 lb-ft (218 Nm) behind an 8 in 3-jaw hydraulic chuck
- 4,000 rpm top speed, against 3,000 rpm on the SL10-II
- 12-station bi-directional turret for 1 in (25 mm) tools and 1.5 in (38 mm) boring bars
- Positioning accuracy of ±0.0002 in (±0.005 mm) and repeatability of 0.0002 in (0.005 mm)
- MT4 tailstock with 3.46 in (88 mm) of quill travel for supporting shafts
Limitations
- Maximum turning length uses the full 21 in (533 mm) of Z travel; the SL10-II turns 29.9 in (759 mm)
- Bar and through-spindle work is capped by the 2.54 in (65 mm) draw tube
- Torque is 161 lb-ft (218 Nm), well under the 260 lb-ft (352 Nm) of the SL10-II for heavy cuts on large diameters
- No driven-tool, Y-axis or second-spindle rows appear in the table, so milled features call for another operation unless Milltronics confirms an option
Best For
Frequently Asked Questions
01
Up to 14 in (356 mm) in diameter and 21 in (533 mm) in length. Swing over the bed is 21.7 in (551 mm) and swing over the cross slide is 11.8 in (300 mm). The chuck listed is an 8 in 3-jaw hydraulic chuck, and the draw tube is 2.54 in (65 mm) in diameter.
02
The A2-6 spindle is listed at up to 4,000 rpm, 30/20 hp (22.4/14.9 kW) and 161 lb-ft (218 Nm). The table gives two power ratings without labelling them, so ask Milltronics which one is the continuous rating.
03
The SL10-II is the larger lathe: a 10 in 3-jaw hydraulic chuck on an A2-8 nose, 17.7 in (450 mm) maximum turning diameter, 29.9 in (759 mm) turning length and 260 lb-ft (352 Nm), but only 3,000 rpm. The SL8-II turns 14 in (356 mm) by 21 in (533 mm), makes 161 lb-ft (218 Nm) and reaches 4,000 rpm, so it suits smaller, faster work.
04
The turret has 12 stations with bi-directional indexing. It takes 1 in (25 mm) shank turning tools and boring bars up to 1.5 in (38 mm). No driven-tool figures are listed for this model.
05
Floor space of 142.8 x 88.3 in (3,627 x 2,243 mm) nominal operating, 83.7 in (2,126 mm) of height and a floor that takes 8,885 lb (4,030 kg). Electrical supply is 26 kVA / 64 A at 208-240 V, 3-phase.
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