🧾 Technical Data Sheet – Used Rizoma R500HD Circular Saw Blade Sharpener

Brand: Rizoma
Model: R500HD
Type: Sharpener for circular blades for iron
Condition: Used – working (as is)
Year of manufacture: nd
Country of manufacture: Italy

Main technical data:

• Maximum sharpenable blade diameter: 500 mm

• Adjustable stroke: yes, variable feed stroke depending on diameter and sharpening angle

• Type of blades that can be sharpened: circular blades made of steel, HSS (High Speed ​​Steel) or with hard metal (widia) tips

• Main motor: single-phase or three-phase (depending on configuration, 2 – 3 HP)

• Power supply voltage: 400 V / 50 Hz

• Grinding wheel motor speed: 2800 – 3000 rpm

• Grinding wheel dimensions: Ø 125 – 150 mm

• Machine weight: approx. 200 – 250 kg

• Overall dimensions: approximately 1200 x 800 x 1500 mm

• Cooling system: tank with pump for coolant emulsion

• Structure: high rigidity monoblock cast iron base

• Head movement: adjustable in inclination and height

• Worktop: adjustable with micrometric system

• Standard accessories: grinding disc, service keys, blade support, manual locking system

• Delivery status: as seen, to be brought up to standard at the buyer's expense

Indicative price: €850.00 + VAT
Pick-up location: Desio (MB)

🧰 Description 

Rizoma R500HD circular saw blade sharpener for iron is a robust and reliable machine, designed to ensure precision and consistency in the resharpening of blades intended for cutting ferrous metals. Like all machines from Rizoma , an Italian company known for its quality construction and ease of use, the R500HD stands out for its solid cast iron structure and the fluidity of its mechanical movements, even after years of use.

Visually, it appears compact yet well-proportioned, with a stable base that ensures zero vibration during sharpening. The steel worktable, with adjustable stroke, allows the machine to be adapted to different blade diameters, up to 500 mm. The micrometric tilt adjustment allows for a perfectly repeatable sharpening angle, essential for ensuring precise cuts and optimal tool life.

⚙️ Main components

• Anti-vibration cast iron base

• Grinding head with micrometric adjustment

• Blade support surface with mechanical locking

• Electric main engine

• Lubrication system with pump and collection tank

• Metal protective fairing

📐 Mechanical characteristics and usage formulas

To achieve the best performance, the sharpening angle (α) can be calculated with the formula:

[
\tan(α) = \frac{h}{r}
]
where h is the cutting depth and r is the blade radius.

The optimal sharpening time (t) depends on the peripheral speed of the grinding wheel ( Vp ) and can be estimated as:

[
t = \frac{π · D}{Vp}
]

where D is the diameter of the grinding wheel in mm and Vp is the speed in m/s.
For the Rizoma R500HD, an optimal speed is between 25 and 30 m/s , avoiding overheating and loss of tempering on the blade.

🧩 Workable materials

The Rizoma R500HD can operate on:

• Mild and carbon steels

• HSS high speed steels

• Carbide blades (with dedicated CBN or diamond grinding wheel)

🛠️ Recommended maintenance

1. Daily cleaning of surfaces and worktops.

2. Periodic check of the coolant level.

3. Regular replacement of the grinding wheel after 30–40 hours of actual work.

4. Check spindle centering every 6 months.

5. Lubricate guides and levers every week.

A properly maintained machine can provide over twenty years of efficient service.

🧾 Safety and regulatory compliance

Since the Rizoma R500HD is a used model and not declared CE compliant, for reuse in the company it is necessary to proceed with an adaptation to the current regulations:

• installation of transparent protective covers

• emergency stop button ;

• check of the electrical wiring and insertion of a differential circuit breaker ;

• grounding check .

🔍 How to recognize a good used one

A specimen in good condition can be recognized by:

• no play in the levers;

• regular engine noise;

• fluid head and plane movements;

• grinding wheel in good condition and guides not oxidized.

🏭 Sectors of use

The Rizoma R500HD is widely used in:

• mechanical workshops and metal carpentry shops;

• profile processing companies;

• manufacturers of industrial tools and blades;

• internal maintenance departments of mechanical industries.

💡 Why it's better to buy it used

Buying a used Rizoma R500HD is a smart choice for those looking for a reliable, affordable sharpener. This machine's mechanical structure is virtually indestructible and, with simple maintenance, can last for decades. It offers excellent value for money, and compared to more recent models, it offers a precision and ease of use that many operators continue to prefer.

I am selling one used Rizoma R500HD circular saw blade sharpener. Adjustable stroke. Machine in good working condition. Seen and liked, to be brought up to standard at the buyer's expense. Price: €850.00 + VAT. Collection only. Desio (MB) Paolo