Combination set is a measuring tool which is frequently used in fitting and machine shop. It consists of a square head, centre-head, bevel protector, sprit level, and graduated steel rule. Therefore, it is known as combination set as shown in Figure 18.22. The square head having two edges at 90° and 45° with steel rule can slide and is located at any position. This feature makes it possible to measure and mark the angle from 45° to 90° with respect to rule. Centre head is used to determine the centre of a round workpiece. It has two arms set at right angle to each other and is positioned on the graduated rule in such a manner that this angle is divided in two equal parts by the edge of the rule. The angular measurement can be done by bevel protector attached with the graduated rule. It can be moved along the edge of steel rule and locked in any position. A sprit level is also used in combination set to check the level of the work with reference to scale edge.
Figure 18.22 Combination Set
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