How do I taper a cylinder?

taper

#1

I want to make a cylinder and taper it into another cylinder. I can’t figure out how to do it and its driving me crazy. I want it to look like one of the green things in this picture. Any help is appreciated. thanks


#2

When you make the first cylinder you can hold down a modifier key. You should fill in your profile so I know what modifier key you would need. With that you could extend the cylinder to the height of the top of the neck. Then use the Scale tool to scale the top face so that it’s a smaller radius.


#3

Make cylinder L1, use scale too to select top circle and scale make cone, select face at end of cone and push pull another cylinder and repeat for second cone, go to bottom and push pull for bottom section. From pic cannot tell if bottom is bowed out you should be able to do that if necessary.


#4

Hi Colin, I tried filling in the information the best I can. I do not know my graphic card model. I have sketchup make and i have Intel Iris Pro 1536 MB. I’m not much of a computer person, I apologize for that! Is any of this information helpful for which modifier key I might need?


#5

Can you fill in your profile? Like, what computer you use, which OS, do you use Pro or Make?

There is an icon in this forum that is like an up arrow from a tray. 7th from the left for me. With that you can upload a SketchUp file that it what you have so far. Then we can look at your file quickly to see what needs to be fixed.


#6

Thanks for trying the profile updates. Although I suspect you’re using Windows, you don’t yet say which version, or whether it’s 32 or 64 bit.


#7

Taper Help.skp (94.1 KB)
i am embarrassed to show you, but this is as far as I am capable of getting.
I have the macbook pro, and the OS is OS X El Capital version 10.11.4.


#8

Maybe you would find it easier to draw if you change your approach. What if you draw the cross section (half of the cross section, actually) and use Follow Me to sweep it around a circular path?

I expect you’ll want it hollow like the ones in your photo this method will make that easier to do, too.


#9

Colin, I don’t mean to steal your thunder. But I happen to be awake…

Here’s a video of how I did it, using push/pull and scale:

Since I don’t use a Mac, I’m guessing that it’s the Option key you press to make the Scale function work symmetrically. For me in Windows, it’s Ctrl.

Note that Dave’s version makes a wall with thickness, whereas mine doesn’t.


#10

And it could be done with Push/Pull and the Move tool without the hollow portion.


#11

A note about Dave’s technique that might escape the novice: the move tool will scale a circle’s radius if you click on one of the “cardinal points” of the circle, that is, the point where you originally dragged out the radius and the other three located at 90 degree intervals from it around the circle. Other points on the circle will shift the location of the entire circle without scaling it.


#12

this is so helpful! Thank you so much for taking the time to do this.


#13

Thank you so much for this. Very helpful!


#14

All cardinal points (either four or two, depending on the number of segments, are located closest to the current drawing axes or closest to center lines parallel to these axes.


#15

I stand corrected!


#16

Although I do notice that there is a difference in behavior between the “two and four cardinal points” cases. With four you can easily change their locations by changing the axes. With two it is still somewhat unpredictable (to me at least), one endpoint and one (opposite) midpoint that aren’t always closest to the axes.


#17

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