This page has been edited 49 times. The last was made by - gheuer gheuer on May 20, 2015 5:37 pm GMT


1.2 Combination Square

Considerations

  • Pre-Operation Checklist is a prerequisite for ANY operation.
  • Applies to standard metal, movable head squares commonly found in the shop. US customary, Metric, and Dual System squares are all used approximately in the same way.
  • Tools are in working condition, capable of being properly verified for accuracy.
  • Test examples are of appropriate size to be measured using the available tools.

Pre-Operation Checklist

Performance Standard -

Level 1

  • Verifies head and rule are free of debris and defects.
  • Releases pressure on head when making adjustments.
  • Handles square with care to maintain accuracy.

Level 2

  • Verifies head is square to rule and slides freely.
  • Ensures square is clean and lubricated and rust free.
  • Meets Level 1 performance standard.


1.2.1 - Verify Material Squareness

Level 1

Given 3 pieces of material 3/4" thick, 6" wide, and at least 12" long, with the end of one piece cut slightly out of square (about 1/2º) to the long edge, and tool set up and ready to measure and/or calibrate, check the end of each piece of material for squareness; or, given one piece of 12" panel stock, verify if it is square or out of square.
  • Correctly identifies which piece of material is out of square.

Level 2 - N/A


1.2.2 - Layout Material For Perpendicular Cuts

Level 1

Given material of uniform width and thickness and tool set up and ready to layout, make marks around a 3/4” x 4" S4S(Surfaced 4 Sides) board (all 4 faces) for a 90º cut.
  • Marks are crisp and easily read.
  • No measurable deviation from 90º is apparent.
  • No measurable deviation occurs where lines meet at adjacent planes

Level 2 - N/A


1.2.3 - Layout Material For Angled Cuts

Level 1

Given material and tool set up and ready to measure and/or calibrate, mark 3/4” x 4" by any length stock for a 45º cut across the wide face of stock.
  • Mark is crisp and easily read.
  • No measurable deviation from 45º is apparent.

Level 2

Given material, tool and a protractor head, mark 3/4” x 4" x any length stock for a specified angle cut across the wide face of stock.
  • Installs Protractor Head.
  • Adjusts head to within ± 0.5º.


1.2.4 - Layout Mortises

Level 1

Given material and a combination square, lay out a 3/8"x 2" mortise, centered on the edge of a piece of 3/4 thick milled stock, 1/2" from the end of the stock.
  • Marks are crisp and easily read.
  • Layout is centered on the stock (side to side).
  • Lines are accurate to within 0.4 mm (1/64") [0.015"].

Level 2 - N/A