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Drill Info MECH-1240

Drill Information for Manual Machine Tools

QuestionAnswer
Which toolholder type is more commonly used in industry for holding on to bits and cutting tools greater than a half-inch in diameter? Taper.
Which taper variety is referred to as self-locking with a consistent taper and wedge at the back? Morse taper.
Which part of the drill bit is the narrow, raised strip that follows the outer edge of the bit's raised land? The margin. The margin is also the location where measurements should be taken as it is the widest part of the bit.
What is the core of the drill that also forms the chisel at the drill bit's tip? The web.
When the lips of the drill bit become dull, what can be done to resharpen them? Grinding them down to a reference bit by hand or with an automated machine tool.
When and how should pilot holes be used? When drilling any hole greater than a half-inch in diameter, a pilot hole should be drilled at a diameter equal to the web or the chisel of the main bit.
What process is used to reduce the edges of the chisel end of a drill bit? Thinning.
What is the difference between spot drills and center drills? Spot drills are used for producing a small divot closer to the size of the main drill bit, while center drills are a more delicate version of the same type with a taper.
What is a center punch? A semi-inaccurate hand tool which adds a very small divot to the work surface.
What is the difference between tools with square ends and tools with straight or tapered ends? Tools with square ends are always hand tools, while tools with straight or tapered ends are always used in automated machines.
When drilling, you must always have ________ before starting, commonly using a clamp or vice? Mechanical advantage.
Created by: griffr311
 

 



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