## Circle Projecting

This section is for useful tips and tricks for Aspire

### Circle Projecting

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.
Bob III
CCSpec

Posts: 1
Joined: Fri Sep 18, 2015 9:40 pm
Model of CNC Machine: ShopBot PRS Standard 96x48

### Re: Circle Projecting

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.

4D
4DThinker
Vectric Wizard

Posts: 1148
Joined: Sun Sep 23, 2012 12:14 pm
Model of CNC Machine: CNC Shark Pro

### Re: Circle Projecting

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.
ozymax
Vectric Craftsman

Posts: 176
Joined: Thu Jan 02, 2014 4:34 am
Model of CNC Machine: Home built cnc router using Mach3.

### Re: Circle Projecting

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:

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:

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.
Attachments
http://www.tedreischl.com

Low Profile CNC Router Vise

TReischl
Vectric Wizard

Posts: 2088
Joined: Thu Jan 18, 2007 6:04 pm
Location: Leland NC
Model of CNC Machine: 8020 Build 48X36X8 RP 2010 Screenset