3D Angles

[cooperAL5P5]

I've been having a lot of trouble trying to boil down my problem in simple words, but here is my best shot:

I need to model a cylinder at a 3D angle relative to the Top plane, where the angle is constrained/specified by a Side view angle and a Front view angle. In other words, how do you specify an angle in 3D space?

It gets trickier, as I need the edge of the cylinder to be a certain distance from the Top plane, regardless of the angle, but I'm trying to start just by planning out the 3D angle problem.

Do I create a single line in a 3D sketch somehow and use the pipe tool? Do I create a rectangle that I can revolve around itself somehow at a fancy 3D angle? (I know how the cylinder's angles look from the Front and Side view, drawn out like diagonal rectangles.)

Can anyone point my in the right direction? Many thanks!

[davebYYPCU]

3 sketches.

Front View, line with dimensioned angle.

Side View, line with that dimensioned angle.

3d sketch, Sketch > project > Intersect Curve, will supply the centre line you are looking for.

Might help...

[TheCADWhisperer]

---

@cooperAL5P5 wrote:

(I know how the cylinder's angles look from the Front and Side view, drawn out like diagonal rectangles.)

---

Sketch out on sheet of paper.

Photo of hand sketch.

Attach photo here.

[g-andresen]

Hi,

try this:

sorry > embed fails > look at attachment

günther

[cooperAL5P5]

Thank you so much, the Project > Intersect Curve function got me the closest to what I'm trying to do.

However, it isn't projecting the edges of the cylinder properly, only the center line (like you mentioned). That would be fine, except I'm realizing I also need to draw the edges correctly in 3D space in order to be able to draw flat circles in 3D space for a loft procedure off the end of the cylinder. Here are some new images so you can see what I mean.

[etfrench]

Why don't you just draw in 2d, extrude, then use a joint to position?

[cooperAL5P5]

Looking at my latest reply with the new pictures, it's pretty tough to make the exact shape I need via just one of the 2D drawings (because the end of the cylinder has specific asymmetrical angles at a taper). Also, I don't know how to make a joint that can orient the object at the 3D angle I need.

[davebYYPCU]

If you are making splayed table legs, you are working too hard, over thinking it.

You need the centre line in space, 

A leg as a standard 2d profile and Revolve it.  Joint the leg to the centre line

then use the floor level to cut the leg foot angle.

Two mirror command, or a mirror and circular pattern.

Might help...

[TheCADWhisperer]

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

[cooperAL5P5]

Sure, here is the .f3d file.

[cooperAL5P5]

Thanks for this. I gave your solution a try, but some new problems are popping up. If I create the leg by doing a revolve of a 2D side view of the first photo attached here, then when I try to make a Joint to the center line in space, the leg somehow gets off (see second photo). I think it might have something to do with the center line? I created it using Project > Intersection Curve.

[TheCADWhisperer]

See Attached example.

[cooperAL5P5]

Woah, that is super slick. But I can't for the life of me understand how you did a lot of those steps.

Eg. How did you create a pipe at that angle? It says it was created on 1 path, but I don't see anything there. I take it it has something to do with Sketch 3, but I can't figure it out.

Thanks so much for the help.

[davebYYPCU]

Nope, dummy body.

Start at the beginning of the timeline, step up one at a time, turn on the eyeballs that are off, as you go, will become obvious.....

[cooperAL5P5]

OH. I'm the dummy. Thanks for the clarification!

Ok, so, one good way to make 3D angles is to create a polygon extrusion from the two side views. Got it!

I'm still left with one issue. If possible, I'd still like to create the first leg using a Revolve on the sketch itself, (rather than a pipe and then a tapered extrusion for the foot like in that .f3d example). I get the sense that making adjustments later on will be easier if I can adjust the sketch dimensions for the foot, for instance. If I go this route, though, I'm left with that issue I mentioned earlier, where the leg no longer matches the side silhouettes once I make a joint to the 3D lines on the polygon. What am I doing wrong?

[davebYYPCU]

The leg you have sketched, and revolved, is as requested, there is no allowance for true length of the double splay,

quick fix is to move the leg down the axis with a Joint offset.

Might help.....

[TheCADWhisperer · Accepted solution]

---

@cooperAL5P5 wrote:

... If possible, I'd still like to create the first leg using a Revolve on the sketch itself, (

---

Yep, that is much easier.  (See Attached)

[cooperAL5P5]

Ahh, you make a sketch on the dummy body. Got it, thank you! My only remaining confusion is that strange 2 1/4" diameter constraint on that third sketch. What is that constraining? There is no circle, and one of the ends of the dimension seems to terminate at an invisible point.

[g-andresen · Accepted solution]

Hi,

This is my way of arranging table legs angled between the table top and the floor:
1. create centerline in specific angles
2."plane on path" and sketch a leg profile I need
3. extruding  profile in a base length
4. extruding the upper part with option "to object" (tabletop)
5. extruding the bottom part with options "to object" & "taper"  to bottom

Screencast

günther

[TheCADWhisperer]

---

@g-andresen wrote:

Hi,

This is my way ....

günther

---

Can you Attach example *,f3d file?

I don’t think that technique would result in the given Design Intent conditions.