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Allied Machine & Engineering

How the Reamer Works Reaming Overview How The Reamers Works

When to Apply a Reamer

• The cut is made in the lead-in zone (3), and the chip is made on the cuƫng face (1). The chip is removed by coolant. • The lead-in (3) is defined depending on the applicaƟon, 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 cuƫng edge (5) avoids retract marks on the piece when the reamer is retracted from the cut. • The front of the cuƫng edge (6) does not cut; if this feature is needed, a frontal lead must be supplied.

• 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 criƟcal geometry characterisƟcs of the hole are the roundness and straightness.

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

(1) Cuƫng Face

(2) Radial Land

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

(4) Rear Face

(5) Undercut of Cuƫng Edge

(6) Front of Cuƫng Edge

Cuƫng Face Chips travel over this area, which aids in chip evacuaƟon.

Radial Land This area helps guide the reamer.

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