Dot Punch: Difference between revisions
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[[File:AutoDotPunch.png|300px|right]] | [[File:AutoDotPunch.png|300px|right]] | ||
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=====Description===== | =====Description===== | ||
[http://wiki.dtonline.org/index.php/File:AutoDotPunch.png '''Dot Punches'''] are similar to '''[[Centre Punch|Centre Punches]]''' but have a sharper point by being ground to an angle of 60 degrees ''(in a similar manner to a '''[[Pens, Pencils and Scribers|Scriber]]''')''. | [http://wiki.dtonline.org/index.php/File:AutoDotPunch.png '''Dot Punches'''] are similar to '''[[Centre Punch|Centre Punches]]''' but have a sharper point by being ground to an angle of 60 degrees ''(in a similar manner to a '''[[Pens, Pencils and Scribers|Scriber]]''')''. | ||
=====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]]''' | |||
'''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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[[File:CentreDotPunching.png|100px|right]] | [[File:CentreDotPunching.png|100px|right]] | ||
Revision as of 23:08, 7 September 2016
Description
Dot Punches are similar to Centre Punches but have a sharper point by being ground to an angle of 60 degrees (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.