Cold chisels

Cold chisels are used for cutting metal. They are made from high-carbon steel, hardened and tempered at the cutting end. The opposite end, which is struck by the hammer, is not hardened but is left to withstand the hammer blows without chipping. 

Cold chisels are classified as flat or cross-cut , according to the shape of the point. 

This chisel has a broad flat point and is used to cut thin sheet metal, remove rivet heads or split corroded nuts. The cutting edge is ground to an angle of approximately 60 Fig. 2.6. 

This chisel has a narrower point than the flat chisel and is used to cut keyways, narrow grooves, square corners and holes in sheet metal too small for the flat chisel. Fig, 2.7. 

When using a cold chisel on sheet-material, great care must be taken not to distort the metal. To prevent distortion, the sheet must be properly 

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Metal punches, rivet sets, cold chisels... 

Chisel metal tool with a sharp, beveled edge that is struck with a hammer to cut and shape stone, metal, or wood scoop chisel, beveled chisel, masonry chisel, cold chisel... 

Cut a piece of nickel chrome spring wire about 6 inches long. Bend it into a hairpin, using pliers if necessary Using a screwdriver, small punch, dull cold chisel, or, as neces-... 

Cold chisels can be sharpened by regrinding the edge on an off-hand grinder. When resharpening, do not allow the chisel edge to become too hot, otherwise it will be tempered, lose its hardness and be unable to cut metal. 

Why is it necessary to keep the cutting edge cool when regrinding a cold chisel ... 

Structiual steels for use in beams, girders, etc., are generally made with a carbon content of 0.15-0.25%. They also include a number of other constituents, such as up to 1.5% manganese and up to 0.50% chromium. Srdfm and phosphorus must be less than 0.05% each. High-carbon steels (0.5-2.0% C) are used for hammers, drills, cold chisels, etc. 

Being stmck by materials is another hazard for some tools and machines. When using a cold chisel or star drill and hammer to break a hole in concrete, particles of concrete fly from the tip of the tool with each blow. Particles fly from the cutting tool as a lathe removes material. The particles may strike the tool or machine user or someone else. Some parts of the body, such as the eyes, have a greater risk of injury than others when stmck by flying materials. 

Tool Guards When striking cold chisels, star drills, and other tools, there is the danger of missing the tool head and striking the hand that holds the tool. There are guards that can protect hands. A round pad of foam or more solid material with a small hole can slip over the tool and on top of the hand. If one misses the tool, the guard will absorb some of the shock and reduce the likelihood of injury. 

Dress cold chisels, punches, hammers, drift pins, and other similar tools that have a tendency to mushroom from repeated poundings. As soon as they begin to crack and curl, grind a slight bevel (approximately 3/16 inch or 4.7 mm) around the head to prevent it from mushrooming. 

Eye protection must be provided and used whenever work involves using cold chisels, drills, grinders or other tools where there is a risk of flying particles or pieces of the tool breaking off. Open-bladed knives, screwdrivers and other sharp tools are to be carried and used so as not to cause injury to the user or others. Non-ferrous (spark-free) tools must be used in flammable atmospheres. Insulated tools must be used where there is a possibility of live electrical work. 

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