A linisher turns a belt or disc of abrasive material to smooth a workpiece, creating a level, even surface. It can also be used to polish materials. Materials are usually wood or metal but, can be plastic also.
The belt of a linisher belt is continuous and runs over rollers. One of the rollers is driven by an electric motor.
Discs and belts are made of abrasive material bonded to a backing of paper and cloth.
Figure 1: Linisher
Figure 2: Linisher used for smoothing wood
There will be linisher operations where a dust mask alone is adequate protection.
Figure 3: Linisher with sanding disc and sanding belt, both driven by the same motor
- Nips trapping hands or fingers
- Contact or impact from thrown workpieces
- Entanglement with turning wheel or disc
- Contact or impact from abrasive discs or belts
- Sparks and hot metal
- Contact, impact or entanglement from unexpected movement (during maintenance, cleaning & repairs)
Personal protective equipment (PPE)
- Eye protection
- Foot protection
- Dust protection
- Deep cuts
- Crush injuries
- HOLD workpieces firmly on the table.
- DO NOT approach the nips.
Nips between disc and table, or between abrasive belt and stop, trapping hands or fingers
- Deep cuts
- Crush injuries
- ADJUST table or stop within 2 mm of the abrasive disc or belt.
- HOLD workpieces firmly against the abrasive belt or stop, using tools or jigs.
Loosely held workpieces are thrown by the abrasive belt.
- Scalping if hair is caught
- Crushed body parts
- TIE back long hair or beards.
- WEAR tight fitting clothes, especially sleeves, without long ties.
- DO NOT wear jewellery.
Loose clothing, long hair, and jewellery can wrap around spinning wheels.
- Deep cuts
- ENSURE POWER CONTROLS are within easy reach to enable rapid shut down when damaged discs or belts are detected.
- INSPECT belts before use.
- LISTEN for noise as the belt starts to break and stop the linisher or stand aside.
- AVOID damage to belts.
- Use belts within a SHORT TIME of purchase.
- DISCARD damaged belts and discs.
Damaged belts will worsen during use, and may become a projectile, hitting the operator or other people close by.
Task – Other (non-mechanical) hazards
Sparks and hot metal
- Burns to skin
- Eye injuries
- Property damage
- CLEAN UP flammable dust from grinding flammable material, before grinding iron or steel which may produce hot sparks.
- REPLACE worn belts or discs before heat builds up excessive.
Flammable material may ignite.
- Breathing problems
- Lung damage
- Eye irritation or damage
- Worsening of existing health problems
- Potential fire or explosion
- USE ventilation to extract dust as much as possible.
- CLEAN up surface dust as quickly as possible.
- Vacuum cleaners MUST be designed for cleaning dust. Blowing flammable dust with compressed air will only place it elsewhere.
- USE dust extraction equipment to minimise dust getting in the operator’s breathing zone.
- ALWAYS USE respiratory protection.
- ALWAYS WEAR eye protection.
Dust from metals, woods and fibre boards, causes respiratory harm.
Finely divided metal, wood, or plastics dust that is not contained and controlled may fuel a fire or explosion.
- Hearing damage or loss
- REDUCE noise levels by isolating machines or enclosing within noise barriers.
- ASSESS noise levels.
- ARRANGE hearing screenings.
- WEAR hearing protection.
Task – Maintenance, cleaning & repairs
Contact, impact or entanglement from unexpected movement
- Deeps cuts
- LOCK-OUT all power supplies before maintenance, cleaning and repairs.
- LEAVE the machine in a safe, clean, tidy state.
- TEST machines regularly to ensure they are operating safety.
- ARRANGE regular inspections by a competent person. Inspect for damage or wear.
- REMOVE linishers that fail safety tests and inspections, and DO NOT USE until repaired or replaced.
A safe noise level over an eight hour day is 85dB(A). A linisher may exceed this noise intensity. Instructions MUST be available in a language understood by employees. Inspections MUST be in accordance with the manufacturer’s instructions.