Centre Drill: Difference between revisions
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When drilling down the centre of a bar held in a '''[[Centre Lathe|Lathe]]''' '''chuck''' however, a [https://en.wikipedia.org/wiki/Drill_bit#Center_and_spotting_drill_bits '''Centre Drill'''] is used. These are short and rigid enough to mark the bar centre. In addtion, they not only drill a pilot hole, but can be used to create the countersink required to locate a | When drilling down the centre of a bar held in a '''[[Centre Lathe|Lathe]]''' '''chuck''' however, a [https://en.wikipedia.org/wiki/Drill_bit#Center_and_spotting_drill_bits '''Centre Drill'''] is used. These are short and rigid enough to mark the bar centre. In addtion, they not only drill a pilot hole, but can be used to create the countersink required to locate a tailstock centre when turning between centres. | ||
[[Category:Drilling and Boring]] | [[Category:Drilling and Boring]] | ||
Revision as of 20:55, 29 October 2015
When drilling metal, it is advisable first to mark the hole centre with a Centre Punch to stop Twist Drills wandering about the surface.
When drilling down the centre of a bar held in a Lathe chuck however, a Centre Drill is used. These are short and rigid enough to mark the bar centre. In addtion, they not only drill a pilot hole, but can be used to create the countersink required to locate a tailstock centre when turning between centres.