Page 26 - Electrician - TT (Volume 1)

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Fig 7 Fig 8

9 Firmer chisel (Fig 9)
It has a wooden handle and a cast steel blade of 150 mm length. Its size is measured according to the width of
the blade eg. 6 mm, 12 mm, 18 mm, 25 mm. It is used for chipping, scraping and grooving in wood.
10 Tenon-saw (Fig 10) BIS 5123, BIS 5130, BIS 5031
Generally the length of a tenon-saw will be 250 or 300 mm. and has 8 to 12 teeth per 25.4 mm and the blade
width is 10 cm. It is used for cutting thin, wooden accessories like wooden batten, casing capping, boards and
round blocks.

Fig 9 Fig 10

11 Files (Fig 11) BIS 1931
These are specified by their nominal length.
Eg.150 mm, 200 mm, 250 mm 300 mm etc.
These files have different numbers of teeth designed to cut only in the forward stroke. They are available in
different lengths and sections (Eg.flat, half round, round, square, triangular), grades like rough, bastard second
cut and smooth and cuts like single and double cut.

These files are used to remove fine chips of material from metals. The body of the file is made of cast steel and
hardened except the tang.
12 Bradawl square pointed (or poker) (Fig 12)

BIS 10375 - 1982
It is specified by its length and diameter eg. 150 mm x 6 mm.
It is a long sharp tool used for making pilot holes on wooden articles to fix screws.

12 13

CITS : Power - Electrician & Wireman - Lesson 1- 4