Marking means setting out dimensions with the help of a
working drawing or directly transferring them from a similar part. The
procedure of marking is as follows:
A-Fine Adjustment of nut B-Vernier slide C-Scriber clamp
screw D – Scriber E – Vernier Scale F – Main Scale G – Base X,Y – Lock Screws
#1. The surface to be marked is coated with the paste of chalk or red lead and allowed to dry.
#2. Then the work is held In a holding device depending upon shape
and size. If it is flat, use
surface plate, if it is round use V block and clamp, else use angle plate etc.
#3. Lines in horizontal direction are scribed by means of a surface gauge. Lines at right angles can be drawn by turning the work through 90 degree and then using the scriber. If true surface is available, try square can also be used.
#4. The centre on the end of a round bar can be located by using an odd leg caliper, surface gauge etc.
#5. The circles and arcs on a flat surface are marked by means of a divider.
#6. After the scribing work is over, indentations on the surface are made using dot punch and hammer.
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