Workshop/Bench Grinder & Sander
|Card RFID Enabled||No|
- 1 The Basics
- 2 Safety
- 3 Acceptable materials
- 4 Cleaning up
- 5 Maintenance
- 6 Risk assessment for use of Workshop Bench Grinder & Sander.
This is a multi-use tool. The grinding wheel portion can be used to grind carbon steels such as High Speed Steel toolbits, and the sanding belt can be used for pretty much everything else. Because the sanding belt size is a little bit odd (it is longer than normal) it can be difficult to find grits finer than 80.
- 150 mm dia x 20 mm grinding wheel (12.7 mm bore)
- 50 mm x 686 mm sanding belt
- 2950 RPM
No specific induction is required to use this machine, but it is important to understand the hazards involved with using a grinding wheel. Please ask if you are unsure whether what you are doing is safe.
- Long hair MUST be tied up, long sleeves should be rolled up securely.
- Eye protection MUST be worn. Safety glasses are in the "Safety Equipment" box.
- Ensure appropriate guards are in place. This includes ensuring that there is not an overly large gap between the edge of the tool rest and the grinding wheel.
- Be careful what you shower in hot sparks.
- The working face of the grinding wheel is the short one at the front of the machine. Do not grind materials on the long sides.
- Grinding wheels should be handled with care.
- For a quick intro into what you can grind on this Aluminium Oxide wheel, check out this link.
- Do not grind non-ferrous metals such as aluminium or copper on the wheel. this can lead to dangerous situations, such as the wheel exploding at high speed.
- If you accidentally load up the wheel with something inappropriate do not worry - simply dress the wheel using the procedure below.
Once you have finished using the grinding wheel, grab the hoover and suck up your dust. Please leave the machine in a cleaner state than you found it. In particular try not to leave sawdust everywhere.
Dressing the wheel
Although it doesn't seem like it the grinding wheel is a consumable item - it just doesn't wear down very quickly. If the cutting isn't going as well as it usually is, perhaps the work-piece is just heating up and not grinding the likelihood is that it needs "dressing" to expose fresh, sharp cutting surfaces and remove gouges introduced by day to say use.
- Breathing protection is required. This process releases a large amount of unpleasant dust that you should not breathe.
- Turn on the grinder
- Using the T shaped diamond dressing tool, press the rough diamond edges against the working face of the grinding wheel.
- Move the dressing tool back and forth until fresh grinding surface is uniformly exposed.
- Try to make the new cutting face as square to the direction of rotation as possible.
- Hoover up the dust produced.
If you are unsure how to safely perform this procedure, ask someone. The mailing list or Slack/IRC is a good place to start.
Replacing the belt
This is quite an involved process which includes balancing the belt after it has been replaced. Instructions coming soon!
- Pack of 5x 80 grit sanding belts
- 150 mm coarse grit grinding wheel
- 150 mm medium grit grinding wheel
- 150 mm fine grinding wheel
Risk assessment for use of Workshop Bench Grinder & Sander.
- 1) Explosion of wheel .
- 2) Sparks in eyes .
- 3) Fingers trapped against wheel.
- 4) Workpiece thrown or ejected from wheel.
- 5) Fingers trapped in sanding belt
- 6) Hair and loose clothing trapped in sanding belt
- 7) Projectile movement of workpiece from sanding belt
Persons at risk.
- Persons nearby.
Initial assessment of risk.
|Hazard identified||Severity||Probability||Risk Factor|
|Explosion of wheel||3||2||6|
|Sparks in eyes||3||3||9|
|Fingers trapped in sanding belt||3||2||6|
|Hair and loose clothing trapped in sanding belt||3||3||6|
|Projectile movement of workpiece from sanding belt||3||3||9|
- Users will be required to demonstrate competence in using the tool safely.
- Safety glasses will be worn.
- Tie back hair and loose clothing
- Hold work piece correctly.
Final assessment of risk
|Hazard identified||Severity||Probability||Risk Factor|
|Explosion of wheel||3||1||3|
|Sparks in eyes||3||1||3|
|Fingers trapped in sanding belt||3||1||3|
|Hair and loose clothing trapped in sanding belt||3||1||3|
|Projectile movement of workpiece from sanding belt||3||2||6|
|Hazard severity||Points Rating||Definition|
|Nil||1||Very minor injury, bruise, graze, no risk of disease.|
|Slight||2||Minor injury, which would allow the individual to continue work after first aid treatment on site or at a local surgery. The duration of the stoppage or treatment is such that the normal flow of work is not seriously interrupted.|
|Moderate||3||Temporary disability causing injury or disease capable of keeping an individual off work for three days or more and reportable under RIDDOR|
|High||4||Causing death, serious injury or permanent disability to an individual.|
|Very high||5||Causing multiple deaths and widespread destruction eg. fire, building collapse.|
|Hazard likelihood||Points Rating||Definition|
|Remote possibility||1||There is really no risk present. Only under freak conditions could there be any possibility of an accident or illness. All reasonable precautions have been taken - This should be the normal state of the workplace.|
|Unlikely||2||This incident or illness might occur but the probability is low and the risk minimal.|
|Possible||3||The accident may occur if additional factors precipitate it, but it is unlikely to happen without them.|
|Highly likely||4||Will happen more often than not. Additional factors could precipitate an incident but it is still likely to happen without this additional factor.|
|Inevitable||5||If the work continues as it is, there is almost 100% certainty that an accident will happen, for example:
A broken stair or broken rung on a ladder Bare, exposed electrical conductors Unstable stacks of heavy boxes
|Risk Rating Score||Definition||Action|
|1 to 4||Low||No action required|
|5 to 9||Moderate||Reduce risks if reasonably practicable|
|10 to 15||High Risk||Priority action to be undertaken|
|16 to 25||Unacceptable||Action must be taken IMMEDIATELY|