Reamer and Reaming

Why Use Reamers?

  • Drilled holes cannot be relied upon to be precise but reamers will accurately ‘size’ a hole.
  • Reamers make holes round.
  • Reamers can be used to machine tapered holes. i.e. Morse tapers.
  • Reamers do not correct ‘out of position’ errors.

Types of Reamers: Often made from H.S.S.

  • Machine Reamers
  • •Hand Reamers

Parts of a Reamer

Parts of a Reamer

Parts of a Reamer

Parts of a Reamer

Parts of a Reamer

Care of Reamers

  • Do not run reamers backwards; remove reamer from hole before stopping machine spindle.
  • Protect the cutting edges of reamers.  (i.e. do not place directly on metal tool crib counter.)
  • Do not use reamers to clean out holes in hardened workpieces.  Use a ‘lap’.

Reaming Problems

  • Oversize or rough holes may be caused by ‘galling’.  Titanium Nitride coating and proper coolant use, may reduce galling.
  • Surface finish may be poor if too fast a feed is used.  Score marks may be caused by damaged cutting edges.
  • Chatter may be caused by too fast a spindle speed.  Teeth may be offset slightly (2º).
  • Bell-mouthed holes may be caused by reamer misalignment.

Expansion & Adjustable Reamers

  • Expansion Reamer
  • Adjustable Reamer: This reamer may “chatter”

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