Circle Projecting

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Circle Projecting

Postby CCSpec » Mon Apr 03, 2017 5:39 pm

I have a customer wanting me to cut a circle template for him that he will lay on a curved metal tank that will give him a perfect circle to insert a round pipe into the curved tank. I know the template will be an oval for the distortion of the circle across the curved surface. Does anyone know if Aspire has a gadget for this, or know of a formula for calculating the size of the oval template.
Thanks in advance,
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Re: Circle Projecting

Postby 4DThinker » Mon Apr 03, 2017 6:10 pm

A few drafting tricks, the measuring tool, and the resizing tool can create the flat oval shape you'll need. If you can post the diameter of the two pipes I'll post a file of how I would do it. Does the smaller pipe intersect at 90 degree and centered on the larger pipe? If not then the angle and intersection point will be needed.

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Re: Circle Projecting

Postby ozymax » Mon Apr 03, 2017 11:45 pm

Try this tube notching template generator.
http://www.blocklayer.com/pipe-notching.aspx
It should allow you to cut a dummy pipe with the correct edge profile on it, then he can scribe the exact shape needed for the penetration hole.
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Re: Circle Projecting

Postby TReischl » Sat Apr 22, 2017 8:32 pm

If the intersection is on center and at 90 to the target tube you will get an "oval" shape. Otherwise, you get all sorts of other shapes. Like the following:

Capture.JPG


This is from a program I wrote about a hundred years ago or so. Notice that there are TWO intersections, one on the outside and one on the inside. If he is inserting a tube then welding he may actually need the INSIDE intersection, not the outer. Here is why:

Capture.JPG


BTW, the program was for rotary axis cutting on a laser. Normally a LOT more segments are generated, but I cut it down so we could see what is going on.
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