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Rule[edit]
Combination square rules are made of steel and can be purchased with gradations in metric, imperial, or both metric and imperial. Both faces of the rule have markings, providing four different sets of markings. This allows different sides to have different graduations (eg. 1mm or 0.5mm markings) or units (ie. metric and imperial). The rule typically comes in lengths between 150mm and 600mm or between 4 inches and 24 inches.[1][2]
Heads[edit]
The heads, occasionally called anvils, are attached to the rule by sliding the rule into a slot in the side of the head. The head is then tightened in place via a lock bolt or lock nut which engages with a channel running the full length of the rule, allowing the head to be tightened on at any point along the rule.[4][2]
The standard or square head has three adjacent flat faces, two of them meet square to one another, and the third face is angled away at 45°. When attached one face is parallel to the rule, one face is perpendicular, and one face is at 45°. The standard head usually incorporates a small spirit level and a small removable scriber.[4]
The protractor head has a flat reference edge which is attached to an adjustable 180° protractor or (sometimes called a turret) with a graduated scale in both directions for reading both the angle or the compliment angle.[1] The protractor head sometimes includes a small spirit level.[4][2]
The centre finder head has two faces meeting at 90°, when attached one edge of the rule bisects the two faces at 45°.
The heads are manufactured from either forged steel, cast iron, die-cast aluminium, die-cast zinc, or plastic. Aluminium and zinc heads are cheaper than steel and iron, but less durable and more prone to inaccuracy.[5] Cast iron and steel heads are also notably heavier. The heads are usually painted except for the flat machined reference faces.
Specifications
Key Features
Standard head[edit]
Labelled diagram of the standard headThe standard head can be used as a:
- Square, for marking and referencing 90° angles and checking if surfaces are flat and square to one another.
- Mitre square, for marking and referencing 45° angles, such as in woodworking for mitre joints.
- Spirit level, to check if a surface is level or similarly if a surface or edge is plumb (vertical).
- Depth gauge or height gauge.
- Form of marking gauge for marking lines parallel to an edge, by setting the head to a certain distance from the end of the rule.[6]
- Reference for directly transferring dimensions without needing to take a measurement, minimising measurement errors and inaccuracies.[7]
Protractor head[edit]
Labelled diagram of the protractor headThe protractor head can be used for:
- Measuring and checking angles between surfaces, edges, and markings.
- Marking angles from an edge
- Directly transferring angles, like a bevel gauge (sliding T gauge), to minimise measurement errors and inaccuracies.
- Measuring and marking angles relative to the horizontal by using the spirit level.[2]
Centre finder head[edit]
Labelled diagram of the centre finder head with a circle as an exampleThe centre finder head can be used for:
- Marking lines through the centre of circular or square objects, such as dowels. Making multiple marks at different angles can be used to identify the point at the centre of the circle.
- Marking lines perpendicular to a curved edge (normal lines).
- Bisecting square corners to mark a 45° angle.[2]
What’s in the box
Specifications
- SKU: GE840IP0HXVFMNAFAMZ
- Model: -
- Size (L x W x H cm): -
- Weight (kg): 0.5
- Main Material: Stainless Steel
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