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FAQs - Mechanical


Fibre Discs

What are fibre discs?

Fibre discs, also known as vulcanised fibre discs, are round grinding wheels made of vulcanised fibre backing coated with resin and abrasive grain on one side. They are commonly used with angle grinders for machining metal surfaces.

What safety standards apply to fibre discs?

The safety requirements for fibre discs and their backing pads are outlined in the EN 13743 standard. It specifies a maximum surface speed (maximum operating speed) of 80 m/s for fibre discs.

What are the advantages of using fibre discs?

Fibre discs offer excellent adaptability due to the elasticity of their backing, resulting in a fine and uniform scratch pattern. They are also more affordable compared to abrasive mop discs and grinding discs.

What are the downsides of fibre discs?

Fibre discs have a shorter service life compared to abrasive mop discs and are relatively sensitive to moisture and temperature fluctuations.

How should fibre discs be stored to maintain their quality?

It is recommended to store fibre discs at a medium relative humidity level of 45 – 65% to prevent buckling. Avoid overheating, as excess pressure during grinding can cause burns and blistering on the backing, leading to grain shedding.

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What is a self-fastening disc?

A self-fastening disc is a type of grinding disc with hook and loop lamination on its reverse side, allowing for quick and easy attachment and removal from a hook and loop pad.

What applications are self-fastening discs suitable for?

Self-fastening discs are highly versatile and suitable for a wide range of applications, including wood, paint, varnish, filler, metal, gelcoat sanding, composite material sanding, and sanding on plasterboard walls and parquet floors.

Are self-fastening discs compatible with hand-operated machines?

Yes, we provide self-fastening discs in various dimensions and hole patterns, compatible with hand-operated machines. Additionally, they offer matching backing pads for different types of machines.

What are the benefits of using self-fastening discs?

The main advantage is the ease of removal from the hook and loop pad, facilitating quick switches between workpieces or materials during grinding tasks.

What backing options are available for self-fastening discs?

Magnet offers self-fastening discs with backings made of paper, film, nylon screen (abrasive screen), or cotton cloth, each tailored to specific application needs.

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Cutting and Grinding

Disc Cutting Grinding 115X2.0 A46Vz

What is the Cutting Grinding 115X2.0 A46Vz disc designed for?

The Cutting Grinding 115X2.0 A46Vz disc is designed for demanding tasks with angle grinders, particularly for cutting and light grinding applications on stainless steel, steel, and NF metal.

Can the Cutting Grinding 115X2.0 A46Vz disc be used for multiple tasks without changing tools?

Yes, this disc eliminates the need for frequent tool changes, saving valuable processing time and enhancing efficiency during cut and grind operations.

What makes the Cutting Grinding 115X2.0 A46Vz disc special?

It is known for being very hard and aggressive, offering excellent performance in terms of cutting and grinding. Its special composition enhances its effectiveness on various materials.

What are the advantages of using the Cutting Grinding 115X2.0 A46Vz disc?

Proven safety: Tested according to oSa directives and complies with European safety standard EN 12413, ensuring reliability and safety during use.

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What are the cutting discs designed for?

The cutting disc is designed for cutting metal sheets, thin pipes, or profiles made of stainless steel, steel, and non-ferrous metal.

What are the properties of the cutting disc?

The cutting discs, are exceptionally thin at 1 mm thickness, free of iron, sulphur, and chlorine, made of corundum or aluminium oxide, ensuring excellent quality and consistent performance over time, and high aggressiveness and long service life, reducing burr formation and thermal load on the workpiece.

What applications are suitable for the cutting disc?

It is suitable for cutting various materials, including steel, stainless steel, construction steel, NF metals, cast materials, stone, plastics, mineral-based materials, solid materials, pipes, flat iron, and tins.

What are the advantages of using the cutting disc?

The bond is perfectly matched to the grit type used, ensuring greater aggressiveness and longer service life and the synthetically produced grit ensures consistently high performance across all types of applications.

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What are grinding discs designed for?

They are designed for work on metal, specifically for surface grinding, edge work, and burr removal tasks.

What are the key features of the grinding discs?

  • Extra hard and highly versatile
  • Engineered for perfect results and long service life
  • Equipped with a depressed centre for added convenience during use

What materials are suitable for use with the grinding discs?

These discs are suitable for grinding various materials including steel, hardened steels, tool steel, stainless steel, high-alloy steels, corrosion and acid-proof steels, aluminium, bronze, copper, brass, zinc die-casting, cast iron, stone, and concrete.

What benefits do the grinding discs offer?

Good and long service life for professional users and rigorously tested for safety according to oSa guidelines and European standard EN 12413.

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What are waterpaper sheets designed for?

Waterpaper sheets are highly flexible and ideal for hand sanding on plastic, varnish, paint, and filler, especially on workpieces with contoured surfaces or profiles.

What type of grain is used in waterpaper sheets?

They are manufactured with synthetically manufactured silicon carbide grain, known for its toughness, hardness, and sharpness. This grain enables effective processing of tough and hard material surfaces.

Are waterpaper sheets suitable for industrial applications?

Yes, they are suitable for series manufacturing and heavy-duty industrial applications due to their special coating and engineered design, ensuring consistent performance and excellent finish even under high loads.

What materials are suitable for sanding with waterpaper sheets?

They are suitable for hand sanding on plastic, varnish, paint, and filler surfaces, offering excellent performance during both dry and wet sanding operations.

What makes waterpaper sheets highly flexible?

They feature a backing made of latex paper, which is highly flexible and shapes perfectly to the contours of the workpiece. Additionally, they are grouped in the A-paper category, indicating papers with the lowest mass per unit area, enhancing their flexibility.

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What are the factors to consider when choosing an abrasive?

The choice of abrasive depends on several factors, including:

  • The material being worked on (metal, wood, plastic, etc.)
  • The desired surface finish (rough, smooth, polished)
  • The type of grinding operation (grinding, sanding, polishing)
  • The cost and performance of the abrasive

What safety precautions should I take when using industrial abrasives?

Always wear appropriate safety gear when using abrasives, including:

  • Safety glasses with side shields
  • Respiratory protection (dust mask)
  • Hearing protection
  • Gloves
  • Proper clothing to protect against sparks and debris

Do abrasives have an expiration date?

The organic elements that may be present in coated abrasive goods eventually deteriorate. Coated abrasive belts and discs should be used up within 10 years after the date of manufacture. This advice presupposes that coated abrasive materials have been properly stored.

How do I dispose of used abrasives safely?

Dispose of used abrasives according to local regulations. Some abrasives may contain hazardous materials and require special disposal procedures. Please enquire with your local municipality.

What are grinding wheels used for?

Grinding wheels are used for various shaping, sharpening, and stock removal applications on metals and other materials.

What are sanding belts used for?

Sanding belts are used for finishing, smoothing, and deburring various materials like wood, metal, and plastics.

What are coated discs used for?

Coated discs (like sandpaper discs) are used for grinding, sanding, and finishing applications on various materials. They come in various grits (coarseness) for different tasks.

What are loose abrasives used for?

Loose abrasives are used in blasting applications, for tumbling and vibratory finishing, and in some types of grinding wheels.

What do Abrasive Grit and Coarseness refer to?

  • Grit refers to the particle size of the abrasive grain. Lower grit numbers indicate larger, coarser grains for faster material removal. Higher grit numbers have finer grains for smoother finishes.
  • Coarseness is a general term for how rough or smooth an abrasive feels. It's related to grit, but also considers the grain distribution and spacing.

What are the Abrasive Grain Properties?

  • Hardness: How well the abrasive grain resists wear and maintains its cutting ability.
  • Toughness: The ability of the grain to resist fracturing during use.
  • Friability: How easily the grain breaks down, exposing new cutting edges.

What are Abrasive Bonding Systems?

  • Bonding materials hold the abrasive grains together in the tool. Different bonds offer varying strengths, flexibility, and heat resistance for specific applications.
  • Common bonding types include:
    • Vitrified bond: Strong and heat-resistant for grinding metals and stone.
    • Resin bond: Versatile and good for general grinding and sanding.
    • Shellac bond: Flexible for polishing and contour sanding Fast-cutting and good for wood and softer materials.
    • Rubber bond: Flexible for polishing and contour sanding

What are some Advanced Abrasives, and their applications?

  • Cubic Boron Nitride (CBN): Extremely hard and wear-resistant for grinding hardened steel and other tough materials.
  • Diamond Abrasives: The hardest abrasive, ideal for grinding very hard materials like stone, concrete, and ceramics.
  • Specialized Applications:
    • Non-woven abrasives: Flexible, web-like structures with abrasive grains for cleaning, polishing, and finishing delicate surfaces.
    • Polishing compounds: Fine abrasive pastes or liquids used for achieving high-luster finishes.

What are some tips for using Industrial Abrasives?

  • Always choose the right abrasive for the job. Consider material, desired finish, and application type.
  • Use the correct pressure and speed. Applying too much pressure can damage the workpiece or dull the abrasive prematurely. Refer to manufacturer recommendations.
  • Dress the abrasive regularly. This cleans and sharpens the abrasive surface for optimal performance (grinding wheels)
  • Store abrasives properly. Keep them dry and cool to prevent moisture damage and maintain their effectiveness.

What are some factors affecting Grinding Performance?

  • Work speed and feed rate: These influence material removal rate, surface finish, and abrasive wear. Higher speeds often lead to faster cutting but can also generate more heat and reduce finish quality.
  • Workpiece material properties: Ductility, hardness, and thermal conductivity of the material being worked on affect how the abrasive interacts with it.
  • Coolant selection: Coolants can improve chip removal, reduce heat generation, and extend abrasive life. Choosing the right coolant depends on the material and application.
  • Machine factors: Spindle speed, power output, and machine rigidity all influence grinding performance.

Abrasive Selection for Specific Materials:

  • Metals: Aluminum oxide for general purpose grinding, zirconia alumina for high-performance grinding, CBN for hardened steel.
  • Wood: Silicon carbide for sanding and shaping, aluminum oxide for finishing.
  • Plastics: Silicon carbide or aluminum oxide depending on the specific plastic type and desired finish.
  • Glass and Ceramics: Diamond abrasives are the primary choice due to their extreme hardness.
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