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|THE COMBINATION SQUARE
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|Combination squares are common in engineering and cabinet making. The tool is used to measure and mark out accurately, being three tools in one. A protractor for marking angles, a centre head often used to mark ‘centres’ of round section material and a square head for ninety degree angles.
|THE PROTRACTOR HEAD
|The protractor head is ideal for marking an angle on material. The lock nut is loosened and the angle set according to the protractor scale. The lock nut is tightened and the angle marked on the material with a pencil. A marking knife is often used to mark out wood and an engineers scriber to mark out metal.
|The combination square is easy to set up and use when marking parallel lines on material.
|THE SQUARE HEAD
|The square head can be used in the same way as a try square, for marking 90 degree angles.
The lock screw is tightened so that it is set firmly to the rule. The combination square is used in the same way as a try square.
|The blade / rule can be set to a suitable length, by sliding the square head along it and locking it in position. The distance normally depends on the width of material it spans.
The square head is ideal for marking / measuring heights (see below). In addition, the spirit level can be used to check if the material is horizontal / level.
When measuring, once the lock nut is tightened, the ‘square’ can be moved away from the material, so that it is easier to read.
|THE CENTRE HEAD
|The centre head is used to find the ‘centre’ of round section material.
Tighten the lock nut and push the centre head against the material. Draw a line across the material. Then, alter the position of the centre head and draw a second line across. Where the two lines ‘cross’ each other, is the centre of the round section.
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