Punch (tool)
0Punch (tool), by Wikipedia https://en.wikipedia.org/wiki?curid=10040741 / CC BY SA 3.0
#Hand_tools
#Metalworking_hand_tools
#Woodworking_hand_tools
Engraving punch A punch is a tool used to indent or create a hole through a hard surface.
They usually consist of a hard metal rod with a narrow tip at one end and a broad flat "butt" at the other.
When used, the narrower end is pointed against a target surface and the broad end is then struck with a hammer or mallet, causing the blunt force of the blow to be transmitted down the rod body and focused more sharply onto a small area.
Typically, woodworkers use a ball-peen hammer to strike a punch.
Punches are used to drive fasteners such as nails and dowels, making a hole, or forming an indentation/impression of the tip on a workpiece.
Decorative punches may also be used to create a pattern or even form an image.
Pin punch Metal pins and similar connectors are driven in or out of holes using a pin punch.
For removal, first use a starter punch to loosen the pin, then use a pin punch to finish.
Centre punch A center punch is used to mark the center of a point.
It is usually used to mark the center of a hole when drilling holes.
A drill has the tendency to "wander" if it does not start in a recess.
A center punch forms a large enough dimple to "guide" the tip of the drill.
The tip of a center punch has an angle between 60 and 90 degrees.
When drilling larger holes, where the drill bit is wider than the indentation produced by a center punch, the drilling of a pilot hole is usually needed.
An automatic center punch operates without the need for a hammer.
Prick punch A prick punch is similar to a center punch but used for marking out.
It has a sharper angled tip to produce a narrower and deeper indentation.
The indentation can then be enlarged with a center punch for drilling.
The tip of a prick punch is 40 degrees （the angle depends on what type of prick punch one is using）.
It is also known as a dot punch.
Transfer punch A t...
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