# How do you find the concentricity of a tolerance?

## How do you find the concentricity of a tolerance?

The concentricity tolerance can be measured using a CMM in four distinct steps:

1. Step 1: Securing the part and fixing the datum axis (theoretical axis)
2. Step 2: Finding the center point for one cross-section.
3. Step 3: Repeating for multiple cross-sections across the cylindrical part length.

## Is concentricity and runout the same?

While concentricity and runout are not the same thing, they often can be used interchangeably to achieve the same basic end result. The big difference is that with runout, you can physically touch and measure the surface of the part.

What is concentricity tolerance?

In GD, concentricity is a complex tolerance used to establish a tolerance zone for the median points of a cylindrical or spherical part feature. Concentricity is generally reserved for high-precision parts, and only when there is a need to control median points.

### How is Cylindricity tolerance measured?

Gauging / Measurement: Cylindricity is measured by constraining a part on its axis, and rotating it around while a height gauge records the variation of the surface in several locations along the length. The height gauge must have total variation less than the tolerance amount.

### What is a concentricity tolerance?

Concentricity is a 3-Dimensional cylindrical tolerance zone that is defined by a datum axis where all the derived median points of a referenced cylindrical feature must fall within. All median points along the entire feature must be in this tolerance zone.

What is difference between circularity and runout?

Circularity is how round a shaft is. Runout is a measurement of how close the spinning axis is to it’s centre line.

## What is tolerance stackup analysis?

Tolerance Stackup analysis is a design tool used to analyse and optimize product design for assembly. It is used to calculate the cumulative effects of part tolerances in an assembly. Therefore tolerance stackup analysis ensures smooth part assembly on the production floor.

## What is concentricity and runout tolerance?

The Concentricity requires that the median points of the controlled feature, regardless of its size, to be within the tolerance zone. Runout tolerances can be state by two tolerance zone. These are circular or total runout.

What is runout tolerance zone?

The tolerance zone is an annular cylindrical volume of revolution about the center axis of the circle and concentric with the feature surface. The specified entire surface of the part must lie within specified runout tolerance zone which is 0.001 full indicator movement.

### What is the tolerance zone for concentricity?

The tolerance zone is equally disposed about the datum axis for concentricity. The Concentricity requires that the median points of the controlled feature, regardless of its size, to be within the tolerance zone. Runout tolerances can be state by two tolerance zone.