![]() ![]() How to Measure & Check Runout on a Lathe - Measuring Lathe Runout It’s a complex tolerance that controls the straightness, angularity, profile and other geometric variation, and usually applies to an entire surface instead of individual circular elements. The difference between the maximum and minimum readings measured by the indicator in a given direction is the total runout. ![]() The actual part to be measured make continuous rotation around the reference axis without axial movement, and the indicator moves continuously along the ideal prime line. ![]() For example, the drill chuck not hold the drill to be parallel with the axis. Axial run-out: is created as the tool or part being at an angle to the axis. Radial run-out: is created due to the tool or part being rotated off the center, and not in line with the main axis. Runout comes in two forms: radial runout and axial runout. Runout tolerance is the maximum allowable runout when the associated actual feature rotates around the reference axis for one or several times. Runout is dynamic, in the drilling process, it will cause the increased diameter of the hole as the drill bit rotates eccentrically. The lathe runout is used to control the position of the CNC turned part feature relative to its axis and limit the axis offset of two parts. Runout (Run-out) is the error of rotating mechanical system, especially the rotation direction of tool or shaft is not completely consistent with the main axis, its often applied to assembled parts with circular cross-sections, such as drill bit and segmented shafts. Runout is an important term in GD&T for circular parts, what is runout and how total runout tolerance applied? The article also shows how to measure or check lathe runout. ![]()
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