Modeling an angled cut

[mbanksA3C2H]

I am trying to model a acoustic guitar bridge to cut on a CNC. I think I have it close, but I am having trouble with the "string ramps" where the string comes up through the hole. I think I may need to do it with a Sweep, but I'm not sure. On the attached file I just extruded them straight down and it doesn't create the angle I need (probably about a 45 degree). I am also attaching a image of what I am trying to model. I'm pretty new to 3D design. Thanks.

[Drewpan]

Hi,

One of the simplest ways to create a cut at 45 degrees is to just create a plane at an angle of 45 degrees and then

make an extrude cut. It is fairly straight forward, just pick a line, create the plane and adjust the angle. Make a sketch

on that plane, extrude and go.

Cheers

Andrew

[TrippyLighting]

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@mbanksA3C2H wrote:

.... I think I have it close, ...

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Your design has 11 yellow icons in the timeline, which isn't really that long. That means the design is pretty broken!

I would fix all of those before cutting anything on a CNC.

Start with the first one and work your way forward.

[jeff_strater · Accepted solution]

lots of ways to do this.  I see you've used Face Draft.  That works.  I also see that you did each cut as a separate operation.  That also works.  But, you can do it much simpler in one go, by extruding to an angled plane:

Also, as I pointed out in the video, you should decide whether this design lives at the root level, or in a child component.  You have a bit of both going on here, as well as some unresolved errors.  Nothing critical to fix if your goal is currently to produce this bridge, but next time, would be good to try to have a cleaner design as you go.  That is hard.  Each time I try, I make mistakes, too, but I try to get better each time, and make different mistakes...

[mbanksA3C2H]

The video is very helpful. I know I have a lot of issues with the design as I am still learning how to model. I actually cut this on the CNC without the ramps and it worked even with the issues.

[TrippyLighting]

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@mbanksA3C2H wrote:

 I actually cut this on the CNC without the ramps and it worked even with the issues.

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As long as there is valid geometry the machining will work fine.
However, modeling changes might result in unexpected changes, and because not all of your sketches are fully defined, it is very easy to make accidental changes that will only become apparent when assembling things!

[TrippyLighting]

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@mbanksA3C2H wrote:

 I actually cut this on the CNC without the ramps and it worked even with the issues.

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As long as there is valid geometry the machining will work fine.
However, modeling changes might result in unexpected changes, and because not all of your sketches are not fully defined, it is very easy to make accidental changes that will only become apparent when assembling things!

[mbanksA3C2H]

Agreed.

[mbanksA3C2H]

I followed your solution and also cleaned up the design a little. I do have a follow up question. When the plane intersects the top surface, which is curved, it causes the intersection to be curved and the slots to have different heights at tip (small lip). Thoughts? Pics and file attached.