Metal Measuring and Laying-out Tool

What Is Meant by Laying Out?
Laying out is the marking of lines, circles, and arcs on metal surfaces; such work is called layout work. It is the transferring of information from a working drawing to metal surfaces to show the machinist or the fitter at the workbench how much metal should be cut away. Laying out on metal is the same as making a drawing on paper, the difference being specific tools are used.

Measuring tools:
Measuring tools are tools used when taking measurements or to transfer measurements to metal parts or components that are being worked on in the workshop. Some tools are used in conjunction with other tools when taking measurements

Scriber:
The scriber is a piece of high carbon steel hardened and tempered they are generally about 6” to 10” long, pointed on one or both ends like a needle. It is held like a pencil to scratch or scribe straight lines on metal. Scribers with bent end are used to scratch lines in places where the straight end cannot reach. Scribers are sharpen on an oilstone. As a safety precaution scribers should be carried with the point facing down and should never be placed in your pocket.

Centre punch
The center punch is used only to make the the centers of holes that are to be drilled. They are made from high carbon steel hardened and tempered. The point angle of the centre punch is between 60 degrees and 90 degrees. A ball pein is used in conjunction with the centre punch when marking the centre of holes to be drilled. Centre punch with mushroom heads shound not be used as a safety precaution. The centre punch should also be firmly held while in use.

Callipers
Common callipers used in the workshop may be and may be identified according to their function and style of manufacture. These include
 * 1) firm or plain joint or
 * 2) spring type