Map a sketch to a face reorients the sketch

[CADer]

So I have a sketch in XY plane and want to map it to a face 3mm above it (also in XY plane). However, when mapped using the suggested Flat Face mode, the sketch gets reoriented. Same for InertialCS.
Does it means that one can only edit a sketch after it has been mapped to a face? Or is it abug?


By the way - mapping a sketch which has already been used for padding not only reorients but also distorts it.

P.S. You can find the project file in the A part has incorporated geometry from another part post a few threads below.

[bejant]

So I have a sketch in XY plane and want to map it to a face 3mm above it (also in XY plane). However, when mapped using the suggested Flat Face mode, the sketch gets reoriented.

Think of a Sketch that is Mapped onto the top side of a cube. To look straight on at the top of the cube, you'd look down onto the top of thecCube. To Edit the Sketch it's the same way, we look straight on (normal to) the Plane of the Sketch. So if the Sketch is Mapped onto the top face of the Cube, when editing the Sketch we'd be looking down at the top face of the cube.

Conversely, if a Sketch is Mapped onto the bottom face of the Cube, when editing the Sketch we'd be looking up from below at the bottom of the Cube.

Re-mapping a Sketch from the top face to the bottom face of a Cube also causes the Sketch to turn accordingly.

Instead of Re-mapping your Sketch from the top face of the flange to the bottom face of the flange, causing it to turn, you can change the Attachment Offset property to move the Sketch downwards the thickness of the flange. The Sketch still isn't attached to the bottom flange; it is only positioned co-planar to the lower face of the flange.

Does it means that one can only edit a sketch after it has been mapped to a face?

No, a Sketch can be edited even if it is not attached to anything and is floating in space.

By the way - mapping a sketch which has already been used for padding not only reorients but also distorts it.

That's a result of the well known topological naming issue.

(Edited typo)

[chrisb]

The sketch is distorted if you use external references which don't follow the new mapping.

[CADer]

@bejant, thank you, indeed it makes sense. However it would be great if it was possible to attach a sketch to a face without "translating it". Attaching to a face has one advantage as compared to the Attachment Offset property: the attached sketch will move with the face, so one woudn't need to manually readjust the offset when modifying some dimensions in the project.

[pl7i92LCNC]

as you go for assemply
isent it in the fianl to be one part
maybe im wrong but you can do this all from the start in one body
and not try to bool them together