Supertec G20P-40CNC
Key Specifications
swing over table
distance between centers
max grinding diameter
max load between centers
wheel size
wheel speed
How much does the Supertec G20P-40CNC cost?
Price estimate
We do not have a price for the Supertec G20P-40CNC 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 Ø200 mm (Ø8 in) of swing and 400 mm (16 in) between centers, the Supertec G20P-40CNC sits in the middle of the maker's three small CNC plunge-type cylindrical grinders. Its wheel is where it parts company with the smaller machine: Ø405 × 50 × Ø127 mm (Ø16 × 2 × Ø5 in), run at 1,800 rpm.
A 50 mm face lets one plunge cover a wider journal than the 38 mm wheel of the G18P-40CNC. The motor behind it is the smallest of the three, though. Supertec lists 3.75 kW (5.0 hp) for the wheel spindle here, against 5 kW (6.7 hp) on the G25P-50CNC with the same wheel width. Stock removal per pass should be planned around that figure.
X infeed travel is 160 mm (6.3 in) at a rapid feeding speed of 6 m/min, and Z rapids at 8 m/min. Both axes resolve 0.001 mm; the X increment is given on diameter as Ø0.001 mm (Ø0.0001 in). The series description credits the Z axis with an AC servo motor and pre-tensioned ballscrews, and a table that rides on a film of oil and is supported over its full travel.
Work is held between MT 3 centers up to 80 kg (176 lb), or in a chuck on the live spindle. Is a bore part of the job? Then the swing-down internal grinding attachment has to be ordered, because Supertec lists it as optional, along with the automatic OD sizing device and touch probe.
Full Specifications
| Parameter | Value |
|---|---|
| Swing Over Table | Ø200 mm (Ø8 in) |
| Distance Between Centers | 400 mm (16 in) |
| Max Grinding Diameter | Ø200 mm (Ø8 in) |
| Max Load Between Centers | 80 kg (176 lb) |
| Wheel Size | Ø405 × 50 × Ø127 mm (Ø16 × 2 × Ø5 in) |
| Wheel Speed | 1,800 rpm |
| Wheel Peripheral Speed | 2,000~3,600 m/min |
| X Axis Rapid Traverse | 6 m/min |
| X Axis Infeed Travel | 160 mm (6.3 in) |
| X Axis Min Increment | Ø0.001 mm (Ø0.0001 in) |
| Wheel Spindle Type | Bearing Type |
| Workhead Speed | Max. 500 rpm |
| Workhead Center Taper | MT 3 |
| Workhead Spindle Type | Fixed & Rottary |
| Workhead Spindle Bore | Ø20 mm (0.79 in) |
| Tailstock Quill Travel | 25 mm (1 in) |
| Tailstock Center Taper | MT 3 |
| Z Axis Rapid Traverse | 8 m/min |
| Z Axis Min Increment | 0.001 mm (0.0001 in) |
| Table Swivel Ccw | 10° |
| Wheel Spindle Motor | 3.75 kW (5.0 hp) |
| Workhead Motor | 0.375 kW (0.5 hp) |
| Lubrication Pump | 5.2 L/min 10kg/cm2 |
| Hydraulic Pump | 20 L/min 55kg/cm2 |
| Coolant Pump | 80 L/min 0.7kg/cm2 |
| X Axis Servo Motor | 1.2 kW (1.6 hp) |
| Z Axis Servo Motor | 1.2 kW (1.6 hp) |
| Gross Weight | 2,700 kg (6,160 lb) |
Specifications sourced from supertec-grinder.com — verified 2026-10-05
Strengths & Limitations
Strengths
- Ø405 × 50 × Ø127 mm (Ø16 × 2 × Ø5 in) wheel on a machine with only 400 mm (16 in) between centers
- 160 mm (6.3 in) of wheelhead infeed travel with a Ø0.001 mm (Ø0.0001 in) minimum increment
- Z axis rapid of 8 m/min and X rapid of 6 m/min, each on a 1.2 kW (1.6 hp) servo motor
- Workhead speed is variable up to Max. 500 rpm, with a Ø20 mm (0.79 in) spindle bore
Limitations
- Wheel spindle motor is 3.75 kW (5.0 hp), less than the 5 kW (6.7 hp) of the G25P-50CNC that carries the same 50 mm wheel width
- Maximum load between centers is 80 kg (176 lb)
- Maximum grinding diameter stops at Ø200 mm (Ø8 in)
- Hydraulic tailstock, internal grinding attachment and in-process sizing are optional
Best For
Frequently Asked Questions
01
Maximum grinding diameter and swing over the table are Ø200 mm (Ø8 in), with 400 mm (16 in) between centers and a maximum load of 80 kg (176 lb) held between centers. Centers are MT 3 at both the workhead and the tailstock, and the tailstock quill travels 25 mm (1 in).
02
A Ø405 × 50 × Ø127 mm (Ø16 × 2 × Ø5 in) wheel at 1,800 rpm, driven by a 3.75 kW (5.0 hp) wheel spindle motor. Supertec gives the peripheral speed range as 2,000~3,600 m/min and describes the spindle as a cartridge type running on four angular contact bearings.
03
The G25P-50CNC is the larger machine: Ø250 mm (Ø10 in) of swing, 500 mm (20 in) between centers and a 5 kW (6.7 hp) wheel motor. The G20P-40CNC covers Ø200 mm (Ø8 in) and 400 mm (16 in) with 3.75 kW (5.0 hp). Both are limited to 80 kg (176 lb) between centers, so the choice is about part size and wheel power, not weight.
04
The table swivelling angle is listed as 10° counter-clockwise. Supertec also notes a swiveling table dial indicator for cylindricity corrections and taper grinding, and the workhead swivels separately for steeper angles on chucked parts.
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