Editing Chisel (section)

===Cold chisel===
[[Image:ColdChisels.jpg|thumb|left|Top: Bull point chisel<br />Bottom: Cold chisel]]	

A cold chisel is a tool made of [[tempered steel]] used for cutting 'cold' metals,<ref name="EB1911">{{cite EB1911|wstitle=Chisel|volume=6|page=247}}</ref> meaning that they are not used in conjunction with heating torches, forges, etc. Cold chisels are used to remove waste metal when a very smooth finish is not required or when the work cannot be done easily with other tools, such as a [[hacksaw]], file, bench shears or power tools.

Cold chisels have a less-acute angle to the sharp portion of the blade than woodworking chisels. This gives the cutting edge greater strength at the expense of sharpness.

Cold chisels come in a variety of sizes, from fine engraving tools that are tapped with very light hammers, to massive tools that are driven with [[sledgehammer]]s. Cold chisels are forged to shape and hardened and [[Tempering (metallurgy)|tempered to a blue colour]] at the cutting edge.
 
The head of the chisel is [[chamfer]]ed to slow down the formation of the mushroom shape caused by hammering and is left soft to avoid brittle fracture splintering from hammer blows.

There are four common types of cold chisels: 

# The ''flat chisel'', the most widely known type, is used to cut bars and rods to reduce surfaces and to cut sheet metal that is too thick or difficult to cut with [[tin snips]].
# The ''cross cut chisel'' is used to cut grooves and slots. The blade narrows behind the cutting edge to provide clearance. 
# The ''round nose chisel'' is used to cut semi-circular grooves for oil ways in bearings. 
# The ''diamond point chisel'' is to clean out corners or difficult places. It is also useful for "pulling over" centre punch marks wrongly placed for drilling.

Although the vast majority of cold chisels are made of steel, a few are manufactured from [[beryllium copper]], for use in special situations where non-[[Ember|sparking]] tools are required.

Cold chisels are predominantly used in [[Repoussé and chasing]] processes for the fabrication of [[bronze]] and [[aluminium]] [[sculptures]].