Cutting speed for reaming ______ cutting speed for drilling for a particular work piece and cutting tool combination.

Explanation:

Reaming:

• Reaming is a cutting process that involves the use of a rotary cutting tool to create smooth interior walls in an existing hole in a workpiece.
• The rotary cutting tool used in reaming is known as a reamer.
• A reamer is a multipoint cutting tool used for enlarging by finishing previously drilled holes to accurate sizes.
• Reaming produces:
  • High-quality surface finish
  • Dimensional accuracy to close limits.
  • Also, small holes which cannot be finished by other processes can be finished.
• Reaming by using hand reamers is done manually for which great skill is needed.
• Machine reamers are fitted on spindles of machine tools and rotated for reaming.
• Machine reamers are provided with morse taper shanks for holding on machine spindles.
• Hand reamers have straight shanks with a ‘square’ at the end, for holding with tap wrenches.
• The speed of reaming is less than the drilling speed for a particular workpiece and cutting tool combination.
• Cutting speed is the speed at which the cutting edge passes over the material while cutting, and is expressed in metres per minute.

Drilling:

• Drilling is a cutting process that involves the use of a drill bit to cut a circular-shaped hole in a workpiece.
• The drill bit used in drilling is a type of rotary cutting tool that, like other rotary cutting tools, rotates while subsequently scraping material out of the workpiece.