Yinglong Superhard Materials Manufactory
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YingLong Superhard Materials Manufactory

Add: Lintong District, Xi'an, China

Tel: +86-29-63354776/63354775

Fax: +86-29-63354775/83852230

Skype: HeroHome-Sunny

Email: Info@HeroHomecn.com

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Grinding Wheels

Choosing a Grinding Wheel

When choosing a grinding wheel, there are a lot of things that you need to consider before you make your purchase, due to many different factors.

 

Here we take a look at the main factors behind your choice of a grinding wheel and the health and safety issues that need to be considered. Having read this buyer’s guide, you should not only have the right wheel for the job but also have taken the necessary precautions so that your use of the grinder is as safe as possible.

Health and Safety: A grinder can be one of the most dangerous machines in the workshop, which is mainly due to the wheels that are fitted to it. To ensure that you and your workplace are safe, we would recommend following certain guidelines.

 

Speed Rating: Before purchasing your wheel, check the running speed of your grinder as this should never be more than the wheel’s maximum speed. Running the wheel above its maximum rpm can be very dangerous and lead to it breaking or exploding.

 

Note: Some wheels are rated in metres per minute, whereas others are in revs per minute, so make sure calculations are done before fitting a new wheel.

 

Abrasive Wheels Course: In the work environment it is mandatory to have been on an abrasive wheels training course before working on this type of machine.

 

There are many different training schemes available but we can personally recommend XYZ Health and safety training.

 

Wheel Integrity: All wheels should be examined after unpacking for any signs of damage that may have occurred during transit. If damage is seen or heard (using ‘ring’ test),  the wheel must not be used and it should be returned back to the supplier.

 

Storage: Wheels should be stored in an area where they will not be susceptible to rough treatment or rooms where there are severe temperature fluctuations as this can damage the bond in the wheels.

 

Machine Set Up: Ensuring the machine is setup correctly at all times is paramount, making sure the guards are in place and tool rests adjusted to the correct clearance.

 

Personal Protective Equipment (PPE): Goggles should always be worn when grinding; when dressing, a suitable dust mask is also a must if dust extraction isn’t available. Other PPE such as overcoats are not essential but preferable.

 

Extraction / Ventilation: When dressing the wheel, suitable extraction should be used to remove the grinding debris.

 

 

Buying a Grinding Wheel

 

Main Considerations

 

Physical Size: The first thing to consider is to buy the appropriate wheel for the size of the grinder. A smaller diameter wheel will work on a larger grinder but this will affect the peripheral speed so it’s not recommended, as it will run more slowly.

 

Material to be Ground: The material will be ground or sharpened directly influences the kind of abrasive required in the wheel. i.e. tungsten carbide tools will need a ‘green’ silicon carbide wheel.

 

The Abrasive: There are a variety of different abrasives on offer, all of which have unique properties such as hardness and strength of bond making them suitable for different materials.

 

The Grit Size: This is defined by the task that you are completing. If a high removal rate of material is required then you will want a coarse grit i.e. 24g. Fine finishing needs a finer grit, such as 100g.

 

Glue / Bond: The bond is what holds the abrasive together in wheel and will once again be determined by the task undertaken. There are three main types of bonds:

1.Vitrified bonds – Made primarily of clay, vitrified bonds are strong and very rigid. This is the best type of bond when a high stock removal is required.

2.Organic bonds – Designed to operate at higher speeds, these bonds will soften under the heat of grinding. These are also good for high stock removal and jobs which require a better finish.

3.Rubber bonds – Offering a smooth grinding action, these wheels are specifically used when a very high quality finish is required.

 

Speed Rating

The wheel must be used on a grinder that does not work above it’s safe operating speed as this may lead to breakage.

 

Wheel dressing

 

Wheel dressing is essential when grinding for a number of reasons.

Cleans and removes metallic waste from the wheel

Exposes fresh new abrasive edges, effectively providing fresh grit with sharp edges

Trues the wheel, which minimises vibration and improves the finish