USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 2/TASK 2
5 Heavy stock is cut in the same manner, except that the cut
is made halfway through the stock, the work is turned over, and the cut
finished from the opposite side.
(d) Cutting Sheet or Plate Metal.
When sheet or plate metal
cutters or machines are not available, the chisel may be used.
However,
using a chisel to cut sheet metal will cause the metal to stretch; avoid
this method, whenever possible.
1 Mark off the guideline for the cut.
2 Secure work in a vise so that the guideline is even with or
below the vise jaws.
3 Use a sharp chisel; start at one edge of the work, holding
the chisel perpendicular to the surface.
Strike the end of the chisel
sharply, keeping the chisel cutting edge firmly held against the work.
Always drive the chisel towards the stationary jaw of the vise.
4 Complete the
cut along the
guideline and finish with a
file.
(3) Blacksmith's Chisels.
The blacksmith's cold chisel is used to
cut heavy gage metal which the machinist's cold chisel will not cut. Hold
the chisel by the handle with one hand, having the cutting edge
perpendicular to the work, and strike the head of the chisel vigorously with
a blacksmith's hammer or sledge. The blacksmith's hot chisel is used in the
same manner to cut hot metal. The work is usually placed on an anvil with a
piece of scrap metal under the work when the cut is to go completely through
the stock.
(4) Track the Rivet Buster Chisel.
To cut a bolt or rivet head,
place the cutting edge of the chisel against the bolt or rivet head where it
seats against the track rail or other unit it secures, and strike the chisel
head sharply with a heavy hammer or sledge.
To cut a rail, place the
cutting edge perpendicular to the top of the rail and strike the chisel head
with a sledge until a nick or shallow cut has been made in the rail. Pick
up the rail and drop it across another rail centered under the cut.
The
rail should snap at the point where the nick was made.
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