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What is the centre head used for?
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Shop for Protractor Sets |
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![Centre head Starrett centre head with the angle between the arms labelled "90 degrees"; combination square set, centre finder,](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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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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![The centre head on a ruler The centre head on the rule, labelled with a 45 degree angle from the edge of the rule to the arm; combination square set, ruler, blade](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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This means that the angle from one of the “arms” to this edge is 45 degrees. |
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![Finding the centre point of a circle Finding the centre point of the end of a circular rod l with a centre head; combination square set, rule, ruler, blade, centre finder](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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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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![The centre head placed on a square corner The centre head placed on a square corner, 90 degrees, angles](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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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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![A centre head being used as a mitre gauge A centre head measuring a 45 degree angle from the corner of a piece of wood; combination square set, rule, ruler, blade](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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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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