Machinery's Handbook, 31st Edition
Reamers
913
Illustration of Terms Applying to Reamers
Relieved Land
Chamfer Length Chamfer Relief
Margin Cutting Edge Flute
Starting Taper
Land Width
Chamfer Angle
Relief Angle Heel
Margin
Radial Rake Angle
Land Width
Flute Land
Cutting Face
Actual Size
Actual Size
Land
Core Diameter
Core Diameter
Bevel
Chamfer Relief Angle
Straight Flutes Shown
Positive Radial Rake Angle and Right-Hand Rotation Shown
Helical Flutes Left-Hand Helix Shown
Radial Zero Degrees Rake Angle and Right-Hand Rotation Shown
Machine Reamer
Hand Reamer
Starting Taper
Neck
Neck
Overall Length
Flute Lengt h
P ilot
Shank Length
Guide
Axis
Cutter Sweep
Actual Size
Cutter Sweep
Squared Shank
Straight Flutes
Hand Reamer, Pilot and Guide
Overall Length
Shank Length
Tang
Flute Length
Taper Shank
Chamfe r Length
Chamfer Angle
Helix Angle
Actual Size
Straight Shank
Shank Length
Helical Flutes R.H. Helix Shown
Body
Chucking Reamer, Straight and Taper Shank Core: The central portion of a reamer that joins the lands below the flutes. Core Diameter: The diameter at a given point along the axis of the largest circle which does not project into the flutes. Cutter Sweep: The section removed by the milling cutter or grinding wheel in entering or leaving a flute. Cutting Edge: The leading edge of the relieved land in the direction of rotation for cutting. Cutting Face: The leading side of the relieved land in the direction of rotation for cutting on which the chip impinges. External Center: The pointed end of a reamer. The included angle varies with manufac turing practice. Flutes: Longitudinal channels formed in the body of the reamer to provide cutting edges, permit passage of chips, and allow cutting fluid to reach the cutting edges. Angular Flute: A flute that forms a cutting face lying in a plane intersecting the reamer axis at an angle. It is unlike a helical flute in that it forms a cutting face that lies in a single plane. Helical Flute: Sometimes called a spiral flute, a flute formed in a helical path around the axis of a reamer. Spiral flute: 1) On a taper reamer, a flute of constant lead; or 2) in reference to a straight reamer, see preferred term Helical Flute . Straight Flute: A flute that forms a cutting edge lying in an axial plane. Flute Length: The length of the flutes, not including the cutter sweep. Guide: A cylindrical portion following the flutes of a reamer to maintain alignment. Heel: The trailing edge of the land in the direction of rotation for cutting.
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