This page has been edited 11 times. The last was made by - gheuer gheuer on Oct 4, 2010 12:43 pm GMT



Line Bore

Considerations

  • Pre-Operation Checklist is a prerequisite for ANY operation.
  • Operations are properly guarded.
  • Safe hand positions are used.
  • Appropriate stance is utilized for optimum balance and part control.
  • Appropriate and safe feed rate is demonstrated while controlling stock movement.
  • Proper evacuation of chips is monitored to prevent bit binding or material burning during operation.
  • Stock is held securely in position and/or against the fence/stop as appropriate.
  • Drill bits are allowed to come up to speed before cutting.
  • Operator clears machine and cleans work area after use.
  • Required OSHA approved personal protective equipment is worn.
  • Lock-out/Tag-out procedure is in place and followed.

Pre-Operation Checklist

Level 1

Performance Standard -
  • Verifies table, fence, and stops are clear of chips or other obstructions
  • Verifies guards, if any, are in place
  • Demonstrates knowledge of all machine specific controls
  • Verifies dust collection operable/operating, if applicable
  • Verifies depth gauge is set securely

Level 2

Performance Standard -
  • Installs and/or adjusts table, fence, and stop(s)
  • Installs or adjusts guard, if any
  • Verifies stock hold downs are working properly
  • Meets Level 1 performance standard

Level 3

Performance Standard -
  • Uses machine manual to effect adjustments and maintenance
  • Recognizes machine-based defects and the adjustment/maintenance solutions
  • Meets Level 1 and 2 performance standards
  • Works independently and is able to supervise and instruct Level 1 and Level 2

Operation - Line Bore Single Set of Holes To Specified Location and Depth

Level 1

Given stock, machine set up with bits installed, fence, location, and depth stops set, drill a single line of holes in proper position to specified depth and distance from edge and end of stock.
Performance Standard -
  • All holes are drilled to proper depth ±0.4 mm (1/64") [0.0156"]
  • All holes are drilled in proper position from end and edge of stock ±0.4 mm (1/64") [0.0156"]
  • All holes are free of tear-out at entry point
  • Sides of holes are smooth and free of burn marks

Level 2

Given stock, a specification for starting position of first hole from end of stock, distance from edge of stock, and depth of holes, set up and adjust machine and drill a single line of holes in proper position to specified depth.
Performance Standard -
  • Selects and sets proper speed for bit and material (if applicable)
  • Adjusts fence position and stop(s) properly
  • Adjusts depth stop properly
  • Meets Level 1 performance standard

Level 3 - N/A



Operation - Line Bore Two Sets of Indexed Holes To Specified Location and Depth

Level 1

Given stock, machine set up with bits installed, fence, location, and depth stops set, drill two consecutive lines of holes in proper position to specified depth and distance from edge and end of stock using indexing pin, or other mechanism appropriate for machine being used.
Performance Standard -
  • All holes are drilled to proper depth ±0.4 mm (1/64") [0.0156"]
  • All holes are drilled in proper position from end and edge of stock ±0.4 mm (1/64") [0.0156"]
  • The center of last hole of the first line and the center of the first hole of the second line are proper distance from each other ±0.4 mm (1/64") [0.0156"]
  • All holes are free of tear-out at entry point
  • Sides of holes are smooth and free of burn marks

Level 2

Given stock, a specification for starting position of first hole from end of stock, distance from edge of stock, and depth of holes, set up and adjust machine and drill two consecutive lines of holes in proper position to specified depth using indexing pin, or other mechanism appropriate for machine being used.
Performance Standard -
  • Selects and sets proper speed for bit and material (if applicable)
  • Adjusts fence position and stop(s) properly
  • Adjusts depth stop properly
  • Meets Level 1 performance standard

Level 3 - N/A



Operation - Drill Thru Holes To Specified Dimensions? (PM)