Dot Punch: Difference between revisions
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=====Features and Uses===== | =====Features and Uses===== | ||
'''Dot Punches''' are held at an angle to the intersection or line to be marked and either lightly struck once with a '''[[:Category:Hammers|hammer]]''' or, alternatively, '''Automatic Dot Punches''' are available, as shown, which are simply pushed down to activate. | '''Dot Punches''' are held at an angle to the intersection or line to be marked and either lightly struck once with a '''[[:Category:Hammers|hammer]]''' or, alternatively, '''Automatic Dot Punches''' are available, as shown, which are simply pushed down to activate. | ||
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Revision as of 13:14, 7 November 2017
Description
Dot Punches are similar to Centre Punches but have a sharper point ground to an angle of 60 degrees by holding it Tangentially to a Tool Grinder and rotating it. This tends to create grinding marks which run along the point and strengthen it rather than weakening it by going across (i.e. in a similar manner to a Scriber)
Features and Uses
Dot Punches are held at an angle to the intersection or line to be marked and either lightly struck once with a hammer or, alternatively, Automatic Dot Punches are available, as shown, which are simply pushed down to activate.
Note:
If Dot Punches are used to mark where a large hole crosses each of its centre lines, for instance, accurate work would result in each ‘dot’ being halved across its diameter.
The lowest cost option is to use a hand-held punch with a hammer but a wide range of automatic punches are available - both Dot Punches and Centre Punches.
- In general, Dot Punches have a sharper point (i.e. 60° instead of 90°) and need only the lower ranges of impact force (e.g. 20N to 50N).
- Automatic punches are simply pushed down against the work-piece and do not need to be struck - indeed, should NOT be struck with a hammer.