Civil Engineering Reference
In-Depth Information
Fig. 11.10. Core drills are used for opening out holes in castings. They usually have
three or more flutes.
Extensions
It is possible to extend a standard drill by fitting an extension to the drill's
shank. Just drill a hole to suit the drill shank into a round bar and fix the drill
into the hole using Loctite (an engineering adhesive) or silver or soft solder.
