Hi there,
I am very new to sketchup and trying to draw this all day without any luck.
I am building a greenhouse. I want to draw the arches.
These are some sample arches.
My timber is 5m long, 70mm wide and 25mm thick. So the radius of the arch will be 5m. Inside timber will start about 10cm before the outside arch.
Can you please help me.
Hey there! Have you watched any of the beginner videos at SketchUp Campus? They are a good place to start for getting familiar with some basic SketchUp fundamentals.
What I would do to approach the arches, is to get the dimensions down for each item of the arch in 2D (on the ground plane, draw the shapes for each item) and then use the push/pull tool to extrude each shape up.
I would create components for each element of the arch. It looks like for each full arch, you would make the following components:
We need more information to be able to help you draw this. How tall at the peak on the inside? How wide at the base? How thick are your spacer blocks?
Thanks alot for your help. I have tried to do this for 2 days now without success. I can get the basic but the measures don`t add up.
Please check the image below.
My timber is 5m long, so the radius of the inner timber will be 5m.
Now Iām at my day job and donāt have access to what I need to show you how to draw this but, with the given dimensions, start with an online calculator to figure out the included angle for an arc with a 5m radius and 5m length. It happens to be 57.296Ā°.
Use the Arc tool (not the 2-Point Arc) to draw an arc with a 5m radius and 57.296Ā° included angle. After that you can use Offset on that arc to create the other edge of the inner board as well as the edges for the outer board. Use the Line tool to connect the ends of the arcs to create faces. then, if you want to make this 3D, Push/Pull to width. Make each bow a component. Rotate the outer one about the center of the arc (I used the origin for this) to raise the bottom up 10cm.
You can draw a block to fit between the inner and outer bow, make it a component and use Copy/Rotate to copy it around the center.
No. The inside peak of the bow will be a little more than 4.2 meters.
Hello DaveRā¦
How do you insert drawings in hereā¦?
My āPeakā is between the arc and a straight base-line, its āKordeā.
If the arc is a 1/4 circle why not draw it ?
@JakobHovman, youāve not drawn the correct arc and youāre working too hard to get what you got. The length of the arc in this case is 5 meters, youāre showing the chord at 5 meters. Those are very different dimensions.
@TIG, The arc isnāt a quarter of a circle, though.
This still needs the purlins but this is generally what a bow shed looks like. Much like a Gothic arch.
Now I see itā¦ doh!
As itās set out around a equilateral triangle to determine the base ārā
we know there are six arcs in the full circle, so useā¦
5m * 6 = Pi * 2 * r
r = 5m * 6 / Pi / 2
r = 4.77m
Youāll note the title of the original post refers to a Gothic arch. Have a look at this. Lots of examples of what heās trying to model. They make great temporary structures for working on boats, too.
Thank you very much.
I forgot to mention about the ridge beam. There will be 2 where the arches come together.
Yes. I left those out as well. No big deal, though. Draw a rectangle for the end of the beam and use Push/Pull to extrude it to length.
I am at work just now and I dont have access to sketchup. Can you please attach the sketchup file as well.
Iām sorry. I didnāt save it.
I am actually crying just nowā¦
Sorry. It would be easily redrawn but I canāt do it right now.
Thanks. I spent 2 whole days on this without any success on the arch.
I will be looking forward to check this on sketchup.
A 5m length of wood bent along a 5m radius will come out to 57.295578 degrees of the circle. If you want to use 60 degrees instead, these numbers work out:
The inside piece will actually extend 61.283523 degrees, but you can compensate for that by aligning the top ends to the ridge beam.
Hereās the two pieces bent in place, if that helps: gothic.skp (64.7 KB)
