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

TIR Measurement

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What is TIR? Total indicator runout (TIR) refers to the distance to which the reamer is cutting off-center. In an ideal situation, 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 practical, the goal is to maintain a TIR as close to 0 as possible. The closer the TIR is to 0, the better the reamer will perform. Allied Machine recommends a TIR of < 0.0005" (0.013 mm). Think of attempting to draw a perfect circle with a drafting compass, but the pencil runs slightly outside the point where the circle began because the center point shifted during the pencil’s path. This slight area of overlap would be the TIR.

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

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 rotating the tool until the indicator reaches the highest value.

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

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