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Sketchup: How to draw four-sided curved legs?

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Forum topic by CharlesA posted 04-28-2015 01:24 PM 829 views 0 times favorited 20 replies Add to Favorites Watch
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CharlesA

3025 posts in 1265 days


04-28-2015 01:24 PM

Topic tags/keywords: question sketchup

Every once in a while I run into a sketchup issue that I can’t get my mind around, even though I am sure there is a simple answer. In this case I am looking to make a model that uses a four sided curved flared leg that matches exiting furniture.

I can do two sides easily using push/pull. But push/pull won’t work on curved surfaces, so I can’t do the remaining four sides. What’s the easy answer?

Here is a profile of the completed side.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson


20 replies so far

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JayT

4786 posts in 1678 days


#1 posted 04-28-2015 01:47 PM

Charles, am I reading right that you are wanting to do something like this, where all four sides arch in?

-- "Good judgement is the result of experience. A lot of experience is the result of poor judgement."

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CharlesA

3025 posts in 1265 days


#2 posted 04-28-2015 02:02 PM

Jay, yes.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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hotbyte

844 posts in 2443 days


#3 posted 04-28-2015 02:05 PM

Looks like something the “Follow Me” tool would do. Draw you legs square/straight. Put an arc on one face. Select the 4 lines that makeup the top (or bottom) face/edge. Select the Follow Me tool and then click on the face created by the arc.

You can use the Follow Me tool much like an edge router. If you can draw a router bit profile, select where you would “route” and let the follow me tool do its thing :)

Wondering if that is what you did JayT???

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JayT

4786 posts in 1678 days


#4 posted 04-28-2015 02:08 PM


Looks like something the “Follow Me” tool would do. Draw you legs square/straight. Put an arc on one face. Select the 4 lines that makeup the top (or bottom) face/edge. Select the Follow Me tool and then click on the face created by the arc.

Wondering if that is what you did JayT???

- hotbyte

You got it. As long as the curve is the same on all four sides, that’s the easiest and fastest way I know of.

Here’s a screenshot, Charles

-- "Good judgement is the result of experience. A lot of experience is the result of poor judgement."

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hotbyte

844 posts in 2443 days


#5 posted 04-28-2015 02:09 PM

Cool. Sketchup is an amazing tool for woodworkers once you get the hang of it.

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CharlesA

3025 posts in 1265 days


#6 posted 04-28-2015 02:16 PM

Took me 40 tries, but I finally figured out what you meant.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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JayT

4786 posts in 1678 days


#7 posted 04-28-2015 02:21 PM

Awesome. Doesn’t matter how many tries, as long as you got it to work.

-- "Good judgement is the result of experience. A lot of experience is the result of poor judgement."

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CharlesA

3025 posts in 1265 days


#8 posted 04-28-2015 02:29 PM

Thanks, again. What was confusing me was that I only wanted the flare at the bottom, and I I couldn’t figure out how to put them together. then I realized that if I just drew the flared part and did follow me, I could then use the push/pull tool on the top and extrude the square top of the leg to full height.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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CharlesA

3025 posts in 1265 days


#9 posted 04-28-2015 02:31 PM

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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JayT

4786 posts in 1678 days


#10 posted 04-28-2015 02:53 PM

Yep, that works. One of the nice things about Sketchup is that, just like woodworking, there are many times several different ways to accomplish the same task.

One of the obstacles I’ve had to overcome using SU is manipulating the shapes like wood. When starting out, I was always trying to take the overall shape and subtract from it, like you would when cutting lumber in the shop. Many times, however, it’s easier to make a smaller shapes and expand or add to them in ways that physical materials cannot do. On the computer there are a lot more ways to join and separate shapes than with physical materials.

-- "Good judgement is the result of experience. A lot of experience is the result of poor judgement."

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hotbyte

844 posts in 2443 days


#11 posted 04-28-2015 02:56 PM

Nice work :)

Another method would be to draw your square leg blank the size of bottom, draw a parallel line on one face based on size you want the top, draw in a 2 point arc for the curved taper, delete the parallel line below the arc (it will be “dissected” from the rest of line). Then, do a follow me for the entire shaped section.

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Daruc

459 posts in 600 days


#12 posted 04-28-2015 04:46 PM

Sometimes it’s just easier to draw the (solid) shape next to it and move it into the leg then use the intersect with model, then delete what you don’t need.

-- -

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CharlesA

3025 posts in 1265 days


#13 posted 04-28-2015 05:25 PM

Since everyone is being so helpful, I’ll ask another. The structure is triangular, but is intended to evoke the square legs in the rest of the set (long story). I’ve gone back to a flare at top and bottom, but need two things: 1) to slope the top (you can see the approximate slope with the lines), and to gently connect the two 30° angles to the 90 flaring end.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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JayT

4786 posts in 1678 days


#14 posted 04-28-2015 05:57 PM

To slope the top, draw a rectangular shape off to the side, tilt it at the angle(s) you need and move it to intersect the top of the leg. Then use the “Intersect faces” command. That will transfer all the lines and then you can delete the unwanted pieces and have your angled face.

I’m not sure exactly what you mean here, though.


to gently connect the two 30° angles to the 90 flaring end.

- CharlesA


-- "Good judgement is the result of experience. A lot of experience is the result of poor judgement."

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CharlesA

3025 posts in 1265 days


#15 posted 04-28-2015 06:04 PM

Thanks. Maybe this picture will show better. I haven’t decided on the final design (which is why I am mocking it up in SU), but I will need to use 60° angles wither in the legs or the stretchers somehow to make the triangle shape. So, one idea is to put 2 30° angles on each leg, and then the stretchers will come straight in. I then need to gently make a curve that will move into the corner angle.
This one doesn’t allow enough room for the tenons, so I’ll have to do it again, but it is something like this:

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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