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11.1 Bench Grinder

Considerations

  • Pre-Operation Checklist is a prerequisite for ANY operation.
  • Appropriate stance is utilized for optimum balance and part control.
  • Operator clears machine and cleans work area after use.
  • Required OSHA approved clothing and personal protective equipment is worn.
  • Lock-out/Tag-out procedure is in place and followed.

Pre-operation Checklist

Level 1

Performance Standard -
  • Verifies the wheel is sound, without cracks or chips, dressed properly.
  • Verifies the wheel is properly guarded.
  • Verifies distance between the tool rest and the edge of the wheel does not exceed 3 mm (1/8") [0.125"].
  • Verifies tool rest is adjusted and tightened securely.
  • Assures water for quenching is close at hand, ready to use.
  • Assures no combustibles are within proximity to the tool.

Level 2

Performance Standard -
  • Confirms the wheel is friable, renewing its abrasive under use.
  • Sets the tongue (spark arrester) to a clearance of ±1.5 mm (1/16") [0.0625"] to 6 mm (1/4" [0.25"].
  • Sets tool rest at proper angle and distance from wheel.
  • Demonstrates ability to dress and/or crown wheels.

11.1.1 - Sharpening a Straight Blade

Level 1

Given a properly set-up machine, wheel, and tool rest, produce a true edge and bevel, ready for honing, on a straight square blade such as a hand chisel or blade for a hand plane.
Performance Standard -
  • Edges are sharp enough to catch when sliding across the surface of a finger nail
  • Edges of blade are straight and square to adjacent edges of tool ±0.4 mm (1/64") [0.0156"]
  • Ground surfaces of tools are smooth and show uniform marks from grinding wheel
  • There is no burning or discoloration

Level 2

Given a bench grinder, properly set up machine to produce a true edge and bevel, ready for honing, on a straight square blade such as a hand chisel or blade for a hand plane.
Performance Standard -
  • Selects and installs proper grinding wheel
  • Performs ring test on grinding wheel
  • Demonstrates ability to match existing angle by adjusting tool rest so contact point is in the middle of the bevel
  • Demonstrates ability to blunt an edge at 90º and grind a new angle
  • Angle tolerance is accurate to within 0.5º
  • Meets Level 1 performance standard


11.1.2 - Sharpening a Concave Blade

Level 1

N/A

Level 2

Given a bench grinder, properly set up machine to produce a concave edge and bevel, ready for honing, on a concave blade such as a hand chisel or blade for a hand plane.
Performance Standard -
  • Performs ring test on grinding wheel
  • Selects and installs proper grinding wheel
  • Demonstrates ability to match existing angle by adjusting tool rest so contact point is in the middle of the bevel
  • Demonstrates ability to blunt an edge at 90º and grind a new angle
  • Angle tolerance is accurate to within 0.5º
  • Edges are sharp enough to catch when sliding across the surface of a finger nail
  • Ground surfaces of tools are smooth and show uniform marks from grinding wheel
  • There is no burning or discoloration