Okamoto ACC-2040DX
Key Specifications
Spindle Power
Accuracy
chuck size
table traverse x
cross traverse y
vertical travel z
How much does the Okamoto ACC-2040DX cost?
Estimated price range
Our best estimate for a cnc grinding machine in this class — not a quote from Okamoto. Configuration moves it a long way.
Overview
The Okamoto ACC-2040DX is a surface grinder with a 500 x 1,000 mm (20 x 40 in) electromagnetic chuck. The listed figures give 1,168 mm (46 in) of table traverse in X, 560 mm (22 in) of cross traverse in Y and 400 mm (15.7 in) of vertical travel in Z, with room for workpieces up to 350 mm (13.8 in) tall.
The spindle is the notable part of the build. It runs in a hydrostatic oil bearing, described in the table as anti-vibration and thermally stable, with 7.5 kW (10 hp) and a variable speed of 1,200 to 1,800 RPM. The wheel can be up to 355 mm (14 in) in diameter and 50 mm (2 in) wide. An oil-film bearing has no rolling elements to mark the surface, and the finish rows are in line with that: Ra 0.05 µm with a fine wheel and spark-out, and flatness under 0.005 mm over the full chuck length.
Load capacity is modest for the chuck area. Maximum workpiece weight is 300 kg (661 lb) on a machine that weighs 8,500 kg (18,739 lb), so large plates have to be checked by mass and not only by footprint.
Dressing is automatic, using a single-point diamond dresser that is CNC programmable, and the control is listed as the Okamoto E-60 CNC. Positioning accuracy is ±0.003 mm. For installation the listed figures call for 220/440 VAC 3-phase 60 Hz power and a 350 L (92 gal) coolant capacity.
Full Specifications
| Parameter | Value |
|---|---|
| Chuck Size | 500 x 1,000 mm (20 x 40 in) electromagnetic |
| Table Traverse X | 1,168 mm (46 in) |
| Cross Traverse Y | 560 mm (22 in) |
| Vertical Travel Z | 400 mm (15.7 in) |
| Max Workpiece Height | 350 mm (13.8 in) |
| Grinding Wheel Max | 355 mm (14 in) diameter x 50 mm (2 in) wide |
| Spindle Speed | 1,200 - 1,800 RPM (variable) |
| Spindle Motor Power | 7.5 kW (10 hp) |
| Spindle Bearing | Hydrostatic oil bearing (anti-vibration, thermally stable) |
| Max Workpiece Weight | 300 kg (661 lb) |
| Positioning Accuracy | ±0.003 mm |
| Flatness Achievable | < 0.005 mm over full chuck length |
| Surface Finish | Ra 0.05 µm (fine wheel, spark-out) |
| Automatic Dressing | Yes (single-point diamond dresser, CNC programmable) |
| CNC Control | Okamoto E-60 CNC (Windows-based proprietary) |
| Machine Weight | 8,500 kg (18,739 lb) |
| Coolant Capacity | 350 L (92 gal) |
| Electrical | 220/440 VAC 3-phase 60 Hz (US standard) |
Specifications compiled from manufacturer literature and industry references. Not independently verified against a published spec sheet — confirm with the manufacturer or an authorised dealer before making a purchasing decision.
Strengths & Limitations
Strengths
- Hydrostatic oil bearing spindle, listed as anti-vibration and thermally stable
- Flatness under 0.005 mm over the full chuck length and Ra 0.05 µm with a fine wheel and spark-out
- 500 x 1,000 mm (20 x 40 in) electromagnetic chuck with 1,168 mm (46 in) by 560 mm (22 in) of traverse
- Automatic dressing with a CNC programmable single-point diamond dresser
- Positioning accuracy of ±0.003 mm
Limitations
- Maximum workpiece weight is 300 kg (661 lb), low for a chuck of 500 x 1,000 mm (20 x 40 in)
- Spindle speed is confined to 1,200 to 1,800 RPM, which narrows the choice of wheel and cutting speed
- The wheel is at most 50 mm (2 in) wide, so covering the 500 mm (20 in) chuck width takes many cross-feed steps
- Vertical travel is 400 mm (15.7 in) and workpiece height stops at 350 mm (13.8 in)
Best For
Frequently Asked Questions
01
The electromagnetic chuck is 500 x 1,000 mm (20 x 40 in). Table traverse is 1,168 mm (46 in) in X and cross traverse 560 mm (22 in) in Y, with 400 mm (15.7 in) of vertical travel. Workpieces can be up to 350 mm (13.8 in) tall and weigh up to 300 kg (661 lb).
02
The listed figures show a hydrostatic oil bearing spindle with 7.5 kW (10 hp) and a variable speed of 1,200 to 1,800 RPM. It carries a wheel up to 355 mm (14 in) in diameter and 50 mm (2 in) wide.
03
Flatness is listed as under 0.005 mm over the full chuck length, and surface finish as Ra 0.05 µm with a fine wheel and spark-out. Positioning accuracy is ±0.003 mm. These are best-case figures that depend on wheel, dressing and coolant condition.
04
The machine weight is listed as 8,500 kg (18,739 lb), the electrical supply as 220/440 VAC 3-phase 60 Hz and the coolant capacity as 350 L (92 gal). Confirm the voltage a particular machine is wired for before connecting it.
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