Pattern Descriptions
Pattern Types
Here is a list of potential patterns. Note that some of these potential patterns are not supported in GD&T Advisor.
Pattern Class
Description
Feature Type
Datum Feature?
Coaxial Axes
A collection of mutually coaxial axial features of size
Hole (any type) or Shaft
Yes
Parallel Axes
A collection of mutually parallel axial features of size
Hole (any type) or Shaft
Yes
Tapered Shaft or
Tapered Hole
Split-draft Shaft or Split-draft Hole
Non-parallel Axes
A collection of axial features of size that are not all parallel
Hole (any type) or Shaft
No
Parallel Mid-planes
A collection of mutually parallel features of size (with a mid-plane)
Slab or Slot
Yes
Slotted Hole
Tapered Slab or
Tapered Slot
Tapered Slotted Hole
Split-draft Slab or Split-draft Slot
Split-draft Slotted Hole
Non-parallel Mid-planes
A collection of features of size (with a mid-plane) that are not all parallel and are all perpendicular to a common plane
Slab or Slot
No
Slotted Hole
Tapered Slab or
Tapered Slot
Tapered Slotted Hole
Split-draft Slab or Split-draft Slot
Split-draft Slotted Hole
All patterns share the same icon () and have the same default name (Pattern #). The pattern class listed in the table is for reference only. All patterns have the following additional restrictions:
Each member must be a Feature of Size of the same type, with the same characteristics and with identical size dimensions.
External references, if any (e.g., reference feature) must be the same for all members.
Pattern Conditions
GD&T Advisor supports two conditions for patterns:
Linked Pattern:
A pattern of features that is associated with a pattern of CAD features in the CAD model.
All members of a CAD pattern are automatically added to a linked pattern.
Pattern maintains an association with a CAD pattern.
Updates automatically if you change the CAD pattern (e.g., change the number of instances).
Individual members may not be added or deleted, except by modifying the associated CAD pattern.
Indicated by a superimposed on the pattern icon (e.g., ).
Supported for the following feature types:
Simple Hole
Blind Hole
Drilled Hole
Multi-Element Hole
Shaft
Drafted features (e.g., tapered hole or tapered shaft)
Unlinked Pattern:
A pattern of features that is not associated with a CAD pattern.
Pattern is manually defined (via the Add Pattern command).
Supported for all feature types that define a valid pattern.
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