Reaming Product Catalog

Allied Machine & Engineering

How the Reamer Works Reaming Overview How The Reamers Works

When to Apply a Reamer

• When the requested tolerance on diameter is IT8 or less. • When the requested finish is 1.6 µm (63 µin) Ra or greater. • When the critical geometry characteristics of the hole are the roundness and straightness.

• The cut is made in the lead-in zone (3), and the chip is made on the cutting face (1). The chip is removed by coolant. • The lead-in (3) is defined depending on the application, the workpiece material, and the stock allowance. • The radial land (2) is important for holding a good alignment, improving the surface roughness, and giving an effect similar to burnishing. The dimension of the radial land depends on the diameter. • The radial land (2) is manufactured to be tapered on the rear. • Fixed reamers are manufactured at the exact tapered value. Expandable reamers must be adjusted to the exact diameter. Both are already supplied at the nominal diameter by the manufacturer. • The undercut of the cutting edge (5) avoids retract marks on the piece when the reamer is retracted from the cut. • The front of the cutting edge (6) does not cut; if this feature is needed, a frontal lead must be supplied.

• When parts are being mass produced. • When the parts are large and expensive. Elements of the Cutting Tooth

(1) Cutting Face

(2) Radial Land

(3) Lead-in / Primary Face / Secondary Face

(4) Rear Face

(5) Undercut of Cutting Edge

(6) Front of Cutting Edge

Cutting Face Chips travel over this area, which aids in chip evacuation.

Radial Land This area helps guide the reamer.

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