AMPC-C_US-EN

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

TIR Measurement

A

What is TIR? Total indicator runout (TIR) refers to the distance to which the reamer is cuƫng off-center. In an ideal situaƟon, the tool would begin in the exact center of the hole, and it would then rotate and cut in a perfect circle. This would result in a TIR of 0. Because a perfect TIR of 0 is not pracƟcal, the goal is to maintain a TIR as close to 0 as possible. The closer the TIR is to 0, the beƩer the reamer will perform. Allied Machine recommends a TIR of < 0.0005" (0.013 mm). Think of aƩempƟng to draw a perfect circle with a draŌing compass, but the pencil runs slightly outside the point where the circle began because the center point shiŌed during the pencil’s path. This slight area of overlap would be the TIR.

DRILLING

B

TIR: How far from center the tool will move during its path.

BORING

C

REAMING

D

Step 1: Check the TIR first on the mandrel (or ground) area of the reamer. Center the indicator in line with the dimple. Measure the TIR by rotaƟng the tool unƟl the indicator reaches the highest value.

Step 2: Next, check the TIR on the cuƫng teeth of the reamer. NOTE: Rotate the tool counterclockwise to avoid chipping the cuƫng teeth with the indicator.

BURNISHING

E

THREADING

X

SPECIALS

C: 94

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