Sketch line intersecting an edge

graham_lock

Hi,

I need to draw a sketch line on the face of a part from a given point to the intersection with an edge.

What would be the best way to detect that intersection please?

Thank you.

NeilCooke

Easiest thing to do is to create a sketch manually as you would want it to behave, then "Show code" from the Part Studio tab at the bottom. That will show you the correct syntax for the sketch constraints.

Spook68

select the end point and the edge and use a coincident mate. i use this a lot:

https://cad.onshape.com/documents/ff345351f1a51fa6ec937559/w/13955793aec30906f8daa850/e/a76debb0d4f0e45a9a21fb8a?renderMode=0&uiState=67e90dd44aa6473d2ff75335

Check Sketch 4 & 5

Tip: A link to the file with the issue is hand.

graham_lock

Thank you for your reply but I’m looking to do this in Featurescript.

graham_lock

I’ve currently worked around this by splitting the parts with planes and then sketching along the splits after finding the edges and vertices created by the splits.

I’d still be interested to know if there is a more direct way of achieving this?

Thank you.

S1mon

Sounds like you need to use a pierce constraint in your sketch.

https://cad.onshape.com/help/Content/sketch-tools-pierce.htm

https://www.onshape.com/en/resource-center/tech-tips/pierce-relation

graham_lock

Thank you I’ll look at that. I didn’t realise that could be down in FS.

NeilCooke

Easiest thing to do is to create a sketch manually as you would want it to behave, then "Show code" from the Part Studio tab at the bottom. That will show you the correct syntax for the sketch constraints.

graham_lock

Good idea thank you.

graham_lock

So I'm struggling with this.

I've made a test document at:

https://cad.onshape.com/documents/713f92603f5e0e6ae5df75bf/w/5425b4fa6aa26e769422562b/e/d349288f4e933f5c9cbb74bd

Essentially I want to draw a line at angle from one edge to the intersection point of a second edge.

The test document doesn't work but shows how the Part Studio code is formed.

Trial and error in decoding the Part Studio code hasn't worked for me so far.

I can't find any documentation or source code for the constraint types?

Any help appreciated.

graham_lock

For anybody who may be interested, the test document at:

https://cad.onshape.com/documents/713f92603f5e0e6ae5df75bf/w/5425b4fa6aa26e769422562b/e/d349288f4e933f5c9cbb74bd

now appears to work with sketch constraints - decoded from Part Studio code as recommended by @NeilCooke

One aspect which requires some investigation is that if a line is drawn at an angle which doesn't intersect the target edge, i.e. the coincident constraint cannot be made then the line is still drawn but outside the bounds of the target edge. Is there a way to test if a constraint is successful or not?