Bench Grinder

Revision as of 19:48, 21 June 2017 by imported>Badspyro (added qualification requirements)

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  • If it sticks to a magnet it is fine.
  • If it is stainless steel (and you are sure) it is fine.
  • Otherwise check first.

Before Use

  • Ensure that the wheels are free from defects and have no aluminium embedded in them. They should be dull, not shiny.
  • Ensure that the rests are near but not touching the wheels.
  • Ensure that the guards are down - adjust them from the hinge not the loose end.
  • Ensure the wheels rotate freely before switching the grinder on by turning them by hand.
  • When adjusting the clear guards, make sure to adjust the left-hand by grabbing the top of the guard. It has snapped off in the past and been reattached using epoxy.

Using the grinder

  • Do not grip the work too close to the wheel - it gets hot
  • Do not force the work too hard - the grinder relies on speed, not on power
  • When smoothing the end of a rod, steady it with the hand closest to the grinder and turn and rotate it with the other.


  • Wear eye protection - hot metal in the eye is not pleasant
  • Do NOT wear gloves - they could get entangled and pull your hand into the machine
  • Never use the side of the wheel, however convenient it may seem. This can cause the wheel to shatter
  • Don't stand in the path of the wheel when starting the grinder in case a wheel should shatter
  • Don't leave the grinder until it has completely stopped spinning - other members may not realise it is still dangerous

Risk Assessment

Company Name Manchester Hackspace
Assessment Completed by Gregory Morris
Date 13-Feburary-2016
Activity or area being assessed Bench Grinder
Location Workshop

Who might be affected

Operator X
Other Members X
Visitors/Public X
Others (please describe)


Hazard Type Description of Hazard Initial Risk Action Required Final Risk
Severity Probability Rating Severity Probability Rating
Fire (electrical) Due to electrical failure 3 2 6 Machine not to be left unsupervised

Machine to be taken out of use if damaged Machine to be visually inspected before use Appropriate fire extinguisher to be available at all times

1 2 2
Burns Personal injury in the form of burns due to friction heating the object being ground 2 4 8 Machine only to be operated by competent persons

Parts to be given time to cool down before handling

2 1 2
Electric Shock Electric shock personal injury and resultant injury - burns and tissue damage. 3 2 6 Machine to be taken out of use if damaged

Machine to be visually inspected before use

3 1 3
Blindness/Eye Injury Blindness/Eye Injury due to sparks 4 4 16 Operator to use eye protection 3 1 3
Entanglement Risk Bodily parts becoming trapped in wheel 4 3 12 Operator to wear appropriate clothes with short sleeves, remove dangling jewelry, and not wear gloves 3 1 3
Cut Risk Cuts from sharp objects 1 3 3 Training to include warning that parts can have sharp edges 1 2 2
Wheel shattering Injury due to impact of shattered grinding wheel 4 3 12 Wheel will not be stressed by grinding on the side or using excessive force 4 1 4

<section begin=PPE />

PPE Requirements

Head Protection Eye Protection Ear Protection Respiration Protection Hand Protection High Visibility Safety Harness
Not required Required Not required Not required Not required Not required Not required

<section end=PPE />

Additional Notes

Any member who wishes to use the equipment must be trained in its safe operation by a competent member or other body, and supervised until competent. The findings of this risk assessment should be explained to the member. Any hazards discovered during use of the equipment should be investigated and this Risk Assessment updated if necessary.

Guide to the risk matrix points system

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 probability 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 Definitions
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
Points System
1 Nil 2 Slight 3 Moderate 4 High 5 Very High
1 Remote L L L L M
2 Unlikely L L M M H
3 Possible L M M H H
4 Highly Likely L M H U U
5 Ineveitable M H H U U

{{#section:Bench_Grinder_Qualification|Bench_Grinder_Test_Title}} {{#section:Bench_Grinder_Qualification|Bench_Grinder_Test}}