AMPC-C_US-EN

REAMING | ALVAN® Reaming Systems by S.C.A.M.I.

How the Reamer Works

A

How the Reamer Works

When to Apply a Reamer

DRILLING

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

• When parts are being mass produced • When the parts are large and expensive

B

BORING

C

REAMING

Elements of the Cutting Tooth

(1) Cutting Face

(2) Radial Land

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

D

(4) Rear Face

(5) Undercut of Cutting Edge

BURNISHING

(6) Front of Cutting Edge

E

THREADING

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

Radial Land This area helps guide the reamer

X

SPECIALS

C: 6

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