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FITTER - CITS

LESSON 9 : Introduction to reamer and their types

Objectives

At the end of this lesson you shall be able to
• different types of reamers
• state the various uses of reamers

Introduction to reamer and their types

Types of reamer & explain it:
1 Hand reamer: Hand reamer is used for reaming hole by hand great skill needed to use this reamer. Hand
reamer have a straight shank.

• Design: Hand reamers have a cylindrical body with straight or spiral flutes along their length. They feature
a tapered cutting end, which gradually increases in diameter towards the shank end. Hand reamers may
have a square or hexagonal shank for gripping with a wrench or other hand tool.
• Cutting Flutes: Hand reamers can have straight or spiral flutes. Straight flutes run parallel to the reamer’s
axis, while spiral flutes spiral around the reamer. Spiral flutes are more efficient in chip evacuation, making
them suitable for deep-hole and interrupted cutting applications.
• Tapered End: The cutting end of a hand reamer is tapered to facilitate entry into the hole and gradual
enlargement as the reamer is rotated. This tapered design helps to minimize chatter and ensure a smooth
cutting action.
• Square or Hexagonal Shank: Hand reamers typically feature a square or hexagonal shank at the non-
cutting end. This shape allows for easy gripping with a wrench or other hand tool, providing leverage and
control during the reaming process.
• Materials: Hand reamers are commonly made from high-speed steel (HSS) or cobalt steel for durability
and wear resistance. Some hand reamers may also be coated with titanium nitride (TiN) or other coatings
to further enhance cutting performance and tool life.
• Applications: Hand reamers are versatile tools used in various industries, including metalworking,
woodworking, automotive, and construction. They are suitable for enlarging and finishing holes in a wide
range of materials, including metals, plastics, and composites.
• Manual Operation: Hand reamers are operated manually by rotating them in the hole using a wrench
or other hand tool. The reamer is inserted into the pre-drilled hole, and then rotated clockwise and
counterclockwise to remove material and achieve the desired dimensions and surface finish.

• Accuracy and Precision: Hand reamers allow for precise control over hole size and surface finish, making
them suitable for applications where tight tolerances are required. However, achieving consistent results
with hand reamers requires skill and experience in manual machining techniques.
2 Machine Reamer : They are mounted in the spindle of machine and roasted. Morse taper rock to these
machine reamers they are, so that they are easily caught in machine spindle

• Design: Machine reamers have a cylindrical body with straight or spiral flutes along their length. The
cutting end of the reamer is typically tapered to facilitate entry into the hole and gradual enlargement as the
reamer rotates. Machine reamers may have a straight or Morse taper shank for mounting in machine tool
chucks or holders.

• Cutting Flutes: Machine reamers can have straight or spiral flutes, similar to hand reamers. Straight flutes
run parallel to the reamer’s axis, while spiral flutes spiral around the reamer. Spiral flutes are more efficient
in chip evacuation, making them suitable for deep-hole and interrupted cutting applications.

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