• This page has been edited 107 times. The last modification was made by - gheuer gheuer on Jul 6, 2015 12:37 pm GMT

3.2 Thickness Planer (Straight Knife Or Segmented Knives)

Considerations

  • Pre-Operation Checklist is a prerequisite for ANY operation.
  • Tool/Machine Manufacturer's safety rules and guidelines are followed.
  • Demonstrates knowledge of and proper use of all machine specific controls.
  • Material is well supported at both in-feed and out- feed tables.
  • Spot check dimensions following the operation.
  • Proper stance and hand position are demonstrated.
  • Assesses stock for suitability to determine whether the finished material size can be achieved.
  • Grain direction is correctly identified and appropriately considered for feed to reduce tear-out.
  • Similar amounts of material are removed from both faces of the board.
  • Loose chips and debris are removed from in-feed table before placement of all stock after every pass.
  • 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.
  • Process is completed in a timely manner.

Pre-Operation Checklist

Level 1

Performance Standard -
  • Verifies tool is properly guarded.
  • Verifies dust collection operable/operating.
  • Ensures paths of in-feed and out-feed have no obstructions to material and operator.
  • Staggers loading to ensure entire width of bed is used.
  • Minimum part length is observed.

Level 2

Performance Standard -
  • Inspects knives for wear or defects.
  • Verifies tables are clean and polished to facilitate smooth material movement.
  • Proper stock removal rates are selected given material type.
  • Meets Level 1 performance standard.

3.2.1 - Planing For Thickness

Level 1

Given material (flattened on one side), a target thickness greater than 6 mm (1/4") [0.25], feed rate pre-selected, and machine set up and ready to cut, plane material to specified thickness.
Performance Standard -
  • Final planed surface exhibits minimal tear-out or chip-out.
  • Proper incremental adjustment made on each pass to reach specified thickness.
  • Sets optimum initial thickness prior to first pass based on maximum thickness or species of material.
  • Final thickness dimension tolerance is ±.0.4 mm (1/64") [0.0156"] across entire surface of material.
  • Planed surface is free of or has minimal snipe (taking into account what is normal for a given machine).

Level 2

Given material (flattened on one side), a target thickness greater than 6 mm (1/4") [0.25"], set up equipment and plane material to specified thickness.
Performance Standard -
  • Verifies/sets feed speed to meet surface quality specification - 15-25 knife cuts per inch (KCPI). Variations accepted for accommodation of difficult grain patterns and materials with defects. Any tear-out must be able to be removed without excessive sanding, scraping, etc.
  • Meets Level 1 performance standard.

3.2.2 - Tapering - on Hold Wednesday; May 20, 2015

Level 1 - N/A

Level 2

Criteria/Performance Standard - Given a jig, safely taper four pieces to given specifications.
Evaluation -
  • Demonstrates techniques for holding material in jig safely.
  • Demonstrates safe usage of jig - stance, feed, support, and clamping to planer bed, if required.
  • Planes taper to given specifications without excessive sanding, scraping etc.

3.2.3 - Operation - Planer Blade Installation (Standard Straight Cutter Head) - on Hold Friday; October 1, 2010

Criteria/Performance Standard - Given a machine with blades removed and new sharp blades, properly and safely install sharpened blades in planer cutter head.
  • Uses standard shop power supply lock out/tag out method.
  • Demonstrates effective use of jigs for knife setting.
  • Knives are set to proper height.
  • Breaks jib screws loose in a safe manner without damaging screws.
  • Demonstrates effective use of jigs for knife setting.
  • Demonstrate effective use of dial indicator to check setting.
  • Knives are set to proper height.
  • Tightens jib screws to correct tension.
  • Demonstrates correct method of setting planer knife sharpener system, if system is part of planer mechanism.
  • Demonstrates minimum depth of pass of planer knife sharpener system, if system is part of planer mechanism.
  • Demonstrates uniform sharpening of all knives on planer head, if system is part of planer mechanism.
  • Checks knife tolerances from cutter head body to tip of knives to prevent burning caused by cutter head body coming into contact with material.
  • Checks knife tolerances for uniformity in hitting surface of material going through planer.
  • Handles both sharp and dull blades safely with correct protective gear and placement of knives in protective material to prevent knife damage.

3.2.4 - Operation - Planer Adjustments - on Hold Friday; October 1, 2010

Criteria/Performance Standard - Properly adjust the following parts of a planer to specifications given.
Evaluation -
  • In-feed Roller (Target: 0.031" below knives).
  • Chip Breaker (Target: 0.031" below knives).
  • Bed Rollers (Target: 0.003-.020" above bed).
  • Pressure Bar (Target: 0.002-.004" above knives).
  • Out-feed Rollers (Target: 0.031" below knives).
  • Final test piece feeds consistently and is free of snipe.