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Round Transition Types
The following list contains the types of round transitions.
Stop cases
Terminates the round using one of three different Stop Cases. Each Stop Case geometry is configured based on the geometrical context.
Stop Case 1
1. Round piece
2. Stop Case transition
3. Stop transition
Stop Case 2
1. Stop Case transition
Stop Case 3
1. Stop Case transition
Stop at Reference
Terminates round geometry at the datum point or datum plane that you specify.
1. Round piece
2. Stop at Reference transition
3. Datum point selected
4. Stop Transition
5. Existing round geometry
Blend
Creates a fillet surface between the round pieces using an edge reference.
 All tangent round geometry stops at sharp edges.
Blend on a corner
1. Round piece
2. Fillet surface
3. Stop transition
Blend between two collinear round pieces
1. Round piece
2. Fillet surface (Blend transition)
3. Stop transition
Continue
Extends the round geometry into two round pieces. Note that tangent round geometry does not stop at sharp edges (compare with Blend).
The resulting geometry looks as if the round was placed first, and then geometry was cut away. Neighboring surfaces are extended to meet round geometry where applicable.
Continue between two collinear round pieces
1. Round piece
2. Extension of round geometry (Continue transition)
3. Stop transition
Corner Sphere
Rounds the corner transition formed by three overlapping round pieces with a spherical corner.
By default, the sphere has the same radius as the largest overlapping round piece. However, you can modify the radius of the sphere as well as the transition distance along each edge enabling you to blend it into the smaller existing radii using fillet surfaces.
 Corner Sphere transitions apply only to geometry where three round pieces overlap at a corner.
2. Fillet surfaces (with length values)
Intersect
Extends two or more overlapping round pieces towards each other until they merge forming a sharp boundary.
 Intersect transitions only apply to two or more overlapping round pieces.
Intersect of two round pieces
1. Round piece
2. Intersect transition
3. Stop transition
Intersect for four round pieces
1. Round piece
2. Intersect transition
3. Stop transition
Intersect at Surface - side 1 and Intersect at Surface - side 2
One side
Creates a one-sided surface patch between round pieces bisected by a draft parting surface. You can control the length of the surface patch along the edge where the transition is created.
You cannot create this type of transition for rounds created before Pro/ENGINEER Wildfire 5.0.
1. Surface patch
2. Length drag handle
Two sides
Creates a two-sided surface patch between round pieces bisected by a draft parting surface.
A D1×D2 conic round is created from one of the rounded edges. The intersection of the D1×D2 conic round and the parting surface defines the curve of intersection.
You can control the parameters of the D1×D2 conic round as well as the lengths of the surface patches along the rounded edges.
You cannot create this type of transition for rounds created before Pro/ENGINEER Wildfire 5.0.
1. Two sides of the surface patch
Patch
Creates a patched surface at the location where three or four round pieces overlap.
You can add an additional side to a three-sided Patch transition by selecting an optional surface on which to create a fillet that contains a radius.
This fillet becomes the fourth side of the resulting patch and is tangent.
 Patch transitions apply only to geometry where three or four round pieces overlap at a corner.
Patch for three round pieces.
1. Round piece
2. Patch transition
3. Stop transition
Same Patch as above with an optional surface
1. Round piece
2. Patch transition (with radius value)
3. Optional surface selected
4. Stop transition
Patch for four round pieces
1. Round piece
2. Patch transition
3. Stop transition
Round Only 1
Round Only transitions create a transition using compounded round geometry.
Two types of Round Only transitions are available based on the geometrical context.
Notice that in the example, each round piece has a different radius.
Round Only 1 for three round pieces having the same convexity
In the example below, the corner transition formed by three overlapping round pieces is rounded with a sweep. The sweep wraps around the round piece with the largest radius.
1. Round Only transition
Round Only 1 for three round pieces having mixed convexity
1. Round Only Transition
Round Only 2
Notice that each round piece has a different radius
Round Only 2 for three round pieces having the same convexity
1. Round Only transition
Round Only 2 for four round pieces having the same convexity
1. Round Only transition
Round Only 2 for three round pieces having mixed convexity
1. Round Only Transition