BRIEF INTRODUCTION TO MARKING - OUT

Photo Credit: Stockillus

Before any work of cutting and shaping can be carried out to produce a component, The shape of the part and the position of holes and slots need to be drawn on the material, to be be a guide with which the filter can work.

This reproduction of engineering drawing on the material before commencing work is called "MARKING - OUT" and it must also be marked accurately.

READ MORE: TOP 7 PRECAUTIONS TO TAKE WHILE USING THE MARKING OUT TOOLS

 The first principle of any marking out is that all the lines must be measured from one vertical and one horizontal base line or datum. The lines are cut into the surface of the workpiece by the very hard and fine point of a scriber, chalk being used to make the line show more clearly. One line must be scribed and if this is to mark a hand or machine-cut edge, It must also be lightly center punched at intervals. The rough edge of the cut will obscure the line just as the final cut is due but the punch marks should show as a check on the accuracy of machining. Holes for drilling should be heavily punched at their centers, The circumference being lightly punched also.

Marking Out tools are of different various types which is well illustrated below.

READ MORE: TYPES OF MAKING - OUT TOOLS.

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Author: ONUOHA MIRACLE IFEANYI

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