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

Diameter Measurement

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Dimples

180°

Using the Measuring Teeth With the reamer assembled, use a presetter or micrometers to measure the reamer diameter using the opposing 180° teeth. A presetter (with at least 2 µm resolution) is preferred to avoid chipping the cutting edges. NOTE: Only two cutting teeth are 180° opposed. The asymmetric spacing of the other cutting teeth will not induce harmonics, which prevents the tool from creating chatter. The red dimples indicate which two opposing teeth are the measuring teeth. All S.C.A.M.I. Reamers have a dimple to indicate the 180° opposing teeth.

Measuring Teeth

Measuring Teeth

Measuring Teeth

Where to Take the Measurement When measuring the diameter, take the measurement from the area of the cutting tooth just below the transition from the lead angle to the OD edge. See the illustration below. The back side of the OD edge has a back taper. This is why measuring from the location just below the lead angle/OD edge transition point results in the most accurate measurement (before the taper begins).

Lead Angle

Transition Point

Actual Cutting Area

Diameter Measurement Location

OD Edge

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