Analysis Modeling > Tolerances > 3DCS Tolerances > Types of Tolerances

The Triple tolerance is used to vary a point, that is shared by three surfaces, in three directions so that its component of variation in each direction has the specified distribution. It is commonly used when gap and flush condition can be checked with a common point.

Some of the more common feature control frames that can be represented by triple tolerance are:

tollin1T

Example Model:

C:\Users\Public\Documents\DCS\3DCS_All Platforms_8_0_0_1\3DCS CAD & Example Models\Reference Models\Tolerances\Triple Tolerance

Inputs Required:

•3 Distributions

•3 Magnitudes

•Tolerance Name

•3 Directions

•Point List

•Description (Optional)

Methodology:

The tolerance acts along three lines within the three specified ranges. The directions are specified by three different vectors (which do not have to be mutually perpendicular).

1.The magnitudes, by which the point is to be deviated linearly, are calculated from the range (plus & minus), distribution, type, sigma, truncation and scale values.

2.The point associated with the tolerance is deviated along the specified vector directions within the defined tolerance ranges.

TriTol1T

tritol3T

Parameters Specific to Triple Tolerance:

•Click on Add Indiv. next to the points list, to graphically pick the points to which the tolerance should be applied. Multiple points may be selected at one time by clicking the Add Win. button and dragging a window around the desired points. The points can also be picked by keying in the name of the point in the Key In field. The points can also be picked by keying in the name of the point.

•Click Rand#1, #2, and #3 to define the Range and Offsets (or Plus and Minus) for the point with each parameter's

•Click Dir#1, #2, and #3 to define the direction vectors of the point.

•The Dir# and the Rand# are linked together in the menu (Ex: by selecting Rand#1, Dir#1 will be automatically selected).

•When the point is picked click on OK and the tolerance is defined.

Note:

When creating the Dual and Triple tolerance, the tolerance and measurement directions must match.