Page 18 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

EXERCISE 59 : Checking the thickness of the sheet metal

and the diameter of the wire using
standard wire gauge (SWG)

Objectives

At the end of this exercise you shall be able to
• check the thickness of the given sheet metal using a standard wire gauge
• check the diameter of the given wire using a standard wire gauge
• checking with standard wire gauge.

Deburr the edges of the sheet on both sides by filling using a flat smooth file. (Fig 1)

Fig 1

Insert the appropriate slot of standard wire gauge which make a snug fit at the edges of the sheet by trial and
errormethod and note the gauge number. (Fig 2)

Fig 2

Then remove the SWG and insert one slot below the test slot and one slot above test slot. You will find one slot
of SWG which enters not very loose or tight.
If the SWG enters the sheet edge in the slot not very tight or loose, then the standard wire gauge number of the
test slot is the correct thickness of the sheet. (Fig 3)

Fig 3

Note: Larger the SWG number, lesser the thickness of the sheet.

3