Bernardo URS 500 N Universal Cylindrical Grinding Machine
The Bernardo URS 500 N Universal Cylindrical Grinding Machine is a precision machine designed for external and internal grinding operations on workpieces up to 500 mm in length and 200 mm in diameter. Equipped with longitudinal and transverse guides featuring a V- and flat guide combination, it ensures smooth operation and high precision. The main spindle is hydrodynamically mounted: an oil film eliminates direct contact with the bearings, minimizing vibrations and extending lifespan. The table is inclinable from +3° to -9° for conical grinding and features manual or hydraulic feed with continuous speed adjustment (0.1–4 m/min). The Ø 400 mm external grinding wheel operates at 1670 rpm, while the internal unit reaches 20,000 rpm. With a robust structure, thick reinforcements, and balanced components, the URS 500 N guarantees thermal stability, high productivity, and excellent grinding results.
Key Features:
External grinding Ø 8–200 mm and internal Ø 13–100 mm
Distance between centers 500 mm, center height 135 mm
Hydrodynamic oil film main spindle to eliminate vibrations
Table inclinable from +3° to -9° for conical operations
Manual or hydraulic longitudinal table feed, adjustable 0.1–4 m/min
Internal grinding up to 20,000 rpm, external with Ø 400 mm grinding wheel at 1670 rpm
Grinding head inclinable ±30°, grinding wheel travel 200 mm
ES-12 H 2-axis digital display included
Technical Specifications
| Specification |
Value |
| Brand |
Bernardo |
| Model |
URS 500 N |
| Distance between centers |
500 mm |
| Center height |
135 mm |
| External grinding diameter |
8 – 200 mm |
| Maximum workpiece weight |
60 kg |
| Internal grinding diameter |
13 – 100 mm |
| Maximum internal grinding depth |
125 mm |
| Table inclination |
+3° to -9° |
| Maximum longitudinal table travel |
600 mm |
| Table feed |
0.1 – 4 m/min |
| Manual table feed |
6 mm/revolution |
| Workpiece spindle speed |
25 – 220 rpm (adjustable) |
| Workpiece spindle taper |
MT 4 |
| Spindle inclination |
90° |
| External grinding wheel |
Ø 400 x 50 x 203 mm |
| External grinding wheel speed |
1670 rpm |
| Internal grinding speed |
20,000 rpm |
| Grinding head inclination |
±30° |
| Grinding head travel |
200 mm |
| Scale reading |
0.005 mm |
| Tailstock |
MT 4, travel 35 mm |
| Grinding wheel motor power |
4.0 kW |
| Spindle motor power |
0.75 kW |
| Machine dimensions (L x W x H) |
2150 x 1450 x 1700 mm |
| Weight |
2170 kg |
Standard equipment
ES-12 H 2-axis digital display
Ø 400 mm grinding wheel
Grinding wheel flange
Ø 200 mm 3-jaw self-centering chuck
Frequency inverter
Fixed and traveling steady rests
Internal grinding device
LED work light
Balancing stand and arbor
2 tailstocks
Cooling system with splash guard
Grinding wheel dresser
Workpiece holder
Service tools
Logistics
Bernardo shipping: 5–9 business days (7 days in the South). Original spare parts available with 3–5 business days shipping. Customer service in Italian available.
Frequently Asked Questions
What is a hydrodynamic spindle and why is it important?
The hydrodynamic spindle supports the shaft on an oil film instead of rolling bearings. This eliminates micro-vibrations that are transmitted to the ground surface as ripples, guaranteeing dimensional tolerances of IT5–IT6 and surface roughness of Ra 0.2–0.4 µm. It is the standard for industrial precision grinding machines — versions with rolling bearings are cheaper but cannot achieve the same tolerances.
What is the difference between URS 500 N and URS 800/1000/1500/2000/3000 N?
All URS N models share the same construction principle (hydrodynamic spindle, grinding head inclinable ±30°, internal grinding). They differ in distance between centers: URS 500 N (500 mm), URS 800 N (800 mm), URS 1000 N (1000 mm), URS 1500 N (1500 mm), etc. The choice depends on the maximum length of the workpieces to be ground.
What coolant should I use?
For cylindrical grinding: 3–5% water+soluble oil emulsion for standard steel; neat grinding oil for high-strength tool steels; dry cutting for cast iron (produces natural lubricating graphite). The cooling system of the Bernardo Cylindrical Grinder is integrated.
Is internal grinding possible on the Bernardo Cylindrical Grinder?
Yes. The grinding head of the Bernardo Cylindrical Grinder also supports internal grinding with a high-speed spindle — check the internal grinding speed and minimum diameter in the technical table.
Are spare parts available?
Original spare parts available with 3–5 business days shipping. Customer service in Italian available.
