topic Re: Why won't it snap a new point to an existing sketch line? in Fusion Support Forum

Why won't it snap a new point to an existing sketch line?

tomFHWKA — Sat, 22 May 2021 06:54:04 GMT

Sometimes it will display this blue square around a point and snap a new line to an existing point on a line in a sketch:

But then other times it shows this X over an existing point and won't snap to it. What causes the X to appear and not snap to an existing point? How can I fix it so it shows the blue square and snaps?

Re: Why won't it snap a new point to an existing sketch line?

HughesTooling — Sat, 22 May 2021 07:54:22 GMT

In the second image is the existing line in the same sketch? Is the problem repeatable, can you export the design as an f3d and attach here or can you make a screencast?

Mark

Re: Why won't it snap a new point to an existing sketch line?

HughesTooling — Sat, 22 May 2021 07:57:38 GMT

Another thought, have you moved the line off the XY sketch plane? If you don't have 3d Sketch enabled and the line's not on the sketch plane snaps will not work.

Mark

Re: Why won't it snap a new point to an existing sketch line?

tomFHWKA — Sat, 22 May 2021 17:08:21 GMT

Thanks for the help Mark. I attached the F3D file. It's easily repeatable when trying to add a new line. It will snap to the grid, but not to an existing sketch point.

Also, I don't understand why the first (and 3rd, they are copies) shape requires I select each individual line when making the gcode. Then when I simulate the fabrication cut (for CNC plasma) it errors out and says "Warning: One or more passes were discarded due to linking constraints." - This shape used to work fine, where I could single click and it would select the entire contour line. Now, after editing the shape a few times, it has these issues. Any ideas what I did?

Re: Why won't it snap a new point to an existing sketch line?

HughesTooling — Sat, 22 May 2021 17:45:14 GMT

You have a lot of sketch entities that are way above the sketch plane, is there a reason for this. Snapping to endpoints etc. will only work on these entities if you have 3d sketch enabled. If you really need the sketch items on 2 levels you will be better off using 2 sketches and using an offset plane to give the difference in height.

Re: Why won't it snap a new point to an existing sketch line?

tomFHWKA — Sat, 22 May 2021 17:30:22 GMT

No, that would be a mistake on my part. In making those sketches, I click the "top" view and then just add sketch lines. What would cause some sketch entities to deviate off the sketch plane?

Re: Why won't it snap a new point to an existing sketch line?

HughesTooling — Sat, 22 May 2021 17:49:47 GMT

Another tip. You will find this far easier and quicker if you extrude into bodies. Make one body in a component then copy and position the components. Selection in the manufacture workspace will work far better using the edge of a body rather than a sketch as well.

Mark

Re: Why won't it snap a new point to an existing sketch line?

HughesTooling — Sat, 22 May 2021 17:51:13 GMT

@tomFHWKA wrote:

No, that would be a mistake on my part. In making those sketches, I click the "top" view and then just add sketch lines. What would cause some sketch entities to deviate off the sketch plane?

Only way I can think of is if you used Move to make copies and moved the Z height by mistake.

Mark

Re: Why won't it snap a new point to an existing sketch line?

tomFHWKA — Sat, 22 May 2021 18:03:52 GMT

Thanks for the help Mark. I moved everything back to the same plane and the snaps work great now. I still need to figure out how I messed up the top left sketch that's causing the simulation error.

Re: Why won't it snap a new point to an existing sketch line?

HughesTooling — Sat, 22 May 2021 18:11:44 GMT

@tomFHWKA You will find this a lot easier if you keep the sketch as simple as possible then fillet an extruded body. As I said above use components then copy the components. Far easier only sketching once, also easier to fully constrain the sketch so edits will be predictable. This is one of your parts with the sketch simplified. Did you know the 2 edges on the left are not aligned? I've attached the design.

Here's a quick screencast on copying and positioning the components.

Mark

Re: Why won't it snap a new point to an existing sketch line?

HughesTooling — Sat, 22 May 2021 18:22:11 GMT

The simulation problem is because you selected most of the lines individually not as a chain. Here's a screencast showing how to select if the whole chain doesn't select at first. Note white dots mean you have unjoined sketch elements so auto chaining will probably fail. Also show it just works with bodies, the CAM will always get the offset side correct using a body.

Mark