Precision surface grinding machines are compared on a few numbers: table size and travels, spindle height, wheel size and speed, spindle power, and feed resolution. All Prayosha models are listed below with the values published by the manufacturer.
Range overview
| Series | Models | Table size (mm) | Spindle (HP) |
|---|---|---|---|
| Premier | PH 818 – PH 1240 | 200 × 450 to 300 × 1000 | 2 – 5 |
| Supreme | PH 1632 – PH 2060 | 400 × 800 to 500 × 1500 | 5 – 7.5 |
| Jumbo / Jumbo Plus | PH 2448 – PH 32100 | 600 × 1200 to 800 × 2500 | 10 – 20 |
| Double Column CNC | C2 × 4080 – C2 × 80200 | 1000 × 2000 to 2000 × 5000 | 15 / 20 (H) · 7.5 / 10 (V) |
Premier series (PH 818 – PH 1240)
| Specification | Unit | PH 818 | PH 1020 | PH 1224 | PH 1230 | PH 1240 |
|---|---|---|---|---|---|---|
| Capacity | ||||||
| Max. table size | mm | 200 × 450 | 250 × 500 | 300 × 600 | 300 × 750 | 300 × 1000 |
| Max. longitudinal travel | mm | 525 | 600 | 675 | 825 | 1050 |
| Max. cross traverse | mm | 225 | 275 | 325 | ||
| Max. spindle centre height above table | mm | 400 | ||||
| Speeds and feeds | ||||||
| Table speed | m/min | 5 – 25 | ||||
| Power cross traverse | mm/min | 1000 | ||||
| Auto cross feed at each table reversal (infinitely variable) | mm | 0.5 – 5 | ||||
| Least count of vertical feed handwheel | mm | 0.002 | ||||
| Grinding head | ||||||
| Grinding wheel size | mm | 250 × 25 × 76.2 | 350 × 50 × 127 | |||
| Spindle motor | HP | 2 | 3 | 5 | ||
| Grinding spindle speed | RPM | 2800 | 1440 | |||
| Hydraulic system | ||||||
| Working pressure | kg/cm² | 20 | ||||
| Hydraulic motor | HP | 2 | 3 | |||
| Tank capacity | L | 75 | ||||
Supreme series (PH 1632 – PH 2060)
| Specification | Unit | PH 1632 | PH 1640 | PH 2040 | PH 2060 |
|---|---|---|---|---|---|
| Capacity | |||||
| Max. table size | mm | 400 × 800 | 400 × 1000 | 500 × 1000 | 500 × 1500 |
| Max. longitudinal travel | mm | 875 | 1075 | 1575 | |
| Max. cross traverse | mm | 450 | 550 | ||
| Max. spindle centre height above table | mm | 550 | |||
| Speeds and feeds | |||||
| Table speed | m/min | 5 – 25 | |||
| Power cross traverse | mm/min | 1000 | |||
| Auto cross feed at each table reversal (infinitely variable) | mm | 0.5 – 5 | |||
| Least count of vertical feed handwheel | mm | 0.002 | |||
| Grinding head | |||||
| Grinding wheel size | mm | 350 × 50 × 127 | |||
| Spindle motor | HP | 5 | 7.5 | ||
| Grinding spindle speed | RPM | 1440 | |||
| Hydraulic system | |||||
| Working pressure | kg/cm² | 20 | |||
| Hydraulic motor | HP | 3 | 5 | ||
| Tank capacity | L | 75 | 150 | ||
Jumbo / Jumbo Plus series (PH 2448 – PH 32100)
| Specification | Unit | PH 2448 | PH 2460 | PH 3060 | PH 3260 | PH 3280 | PH 30100 | PH 32100 |
|---|---|---|---|---|---|---|---|---|
| Capacity | ||||||||
| Max. table size | mm | 600 × 1200 | 600 × 1500 | 750 × 1500 | 800 × 1500 | 800 × 2000 | 750 × 2500 | 800 × 2500 |
| Max. longitudinal travel | mm | 1275 | 1575 | 2150 | 2600 | |||
| Max. cross traverse | mm | 650 | 800 | 850 | 800 | 850 | ||
| Max. spindle centre height above table | mm | 700 | ||||||
| Speeds and feeds | ||||||||
| Table speed | m/min | 5 – 25 | ||||||
| Power cross traverse | mm/min | 1500 | ||||||
| Auto cross feed at each table reversal (infinitely variable) | mm | 0.5 – 5 | ||||||
| Least count of vertical feed handwheel | mm | 0.002 | ||||||
| Grinding head | ||||||||
| Grinding wheel size | mm | 450 × 50 × 127 | ||||||
| Spindle motor | HP | 10 | 15 | 20 | ||||
| Grinding spindle speed | RPM | 1440 | ||||||
| Hydraulic system | ||||||||
| Working pressure | kg/cm² | 20 | ||||||
| Hydraulic motor | HP | 7.5 | 10 | |||||
| Tank capacity | L | 200 | 250 | |||||
Double column CNC (C2 × 4080 – C2 × 80200)
| Specification | Unit | C2 × 4080 | C2 × 6080 | C2 × 60100 | C2 × 60120 | C2 × 80200 |
|---|---|---|---|---|---|---|
| General capacity | ||||||
| Grinding surface of table | mm | 1000 × 2000 | 1500 × 2000 | 1500 × 2500 | 1500 × 3000 | 2000 × 5000 |
| Max. travel (cross × longitudinal) | mm | 1100 × 2200 | 1600 × 2200 | 1200 × 2700 | 1600 × 3200 | 2100 × 5200 |
| Wheel bottom to table (vertical head) | mm | 600 | ||||
| Spindle centre height from table | mm | 850 | ||||
| Max. height, table top to bottom of standard wheel | mm | 500 | ||||
| Hydraulic table speed | m/min | 1.5 – 18 to 2.5 – 25 (optional) | ||||
| Cross movement | ||||||
| Clearance between the columns | mm | 1200 | 1700 | 2200 | ||
| Intermittent cross feed, approx. (electro-mechanical) | mm | 1 – 40 | ||||
| Rapid traverse, approx. | mm/min | 3000 | ||||
| Hand feed per division (MPG) | mm | 0.001 | ||||
| Vertical downfeed | ||||||
| Rapid traverse, approx. | mm/min | 3000 | ||||
| Hand feed per division (MPG) | mm | 0.001 | ||||
| Grinding wheel | ||||||
| Wheel dimension (OD × W × ID) | mm | 510 × 100 × 203 | ||||
| Spindle speed (50/60 Hz) | RPM | 1000 – 1400 | ||||
| Motors | ||||||
| Horizontal head spindle motor | HP | 15 / 20 | ||||
| Vertical head spindle motor | HP | 7.5 / 10 | ||||
| CNC specification | ||||||
| Cross feed rapid feed rate, approx. | mm/min | 3000 | ||||
| Cross / vertical infeed least input increment | mm | 0.001 | ||||
| Rapid vertical rate | mm/min | 3000 | ||||
How to read these tables
- Longitudinal travel is longer than the table so the wheel can clear both ends of the work.
- Least count of vertical feed is the smallest depth step on the handwheel: 0.002 mm on hydraulic models, and 0.001 mm MPG on the double column CNC.
- Spindle centre height limits how tall a part or fixture can be.
Specifications may change. Always confirm the final specification in your quotation.
Frequently asked questions
What is the smallest Prayosha surface grinder?
The Premier PH 818, with a 200 × 450 mm table.
What is the largest?
The double column CNC C2 × 80200, with a 2000 × 5000 mm grinding surface.
What feed resolution do the machines have?
0.002 mm on the vertical handwheel of the hydraulic PH series, and 0.001 mm (MPG and CNC increment) on the double column CNC.
