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What is the centre head used for?
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Shop for Protractor Sets |
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The centre head is the part of the combination square set which has two “arms”. These “arms” meet along one edge of the ruler, at a 90 degree angle. |
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This means that the angle from one of the “arms” to this edge is 45 degrees. |
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The centre head can be used to determine the centre of circular objects, such as the end of rods. |
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Because the “arms” rest at 90 degrees from each other, they can also be used to determine whether the corner of an object is perfectly square. |
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When placed on the corner of an object with the rule attached, the user can draw a 45 degree angle from that corner. |
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