ellipsoid

This section is for useful tips and tricks for Aspire

ellipsoid

Postby aaron1869 » Sat Jun 02, 2018 3:53 pm

I have a customer that wants me to make an ellipsoid mold. The mold needs to be 3"X28"x28" with a depth of 1 1/2" at the center. I can create a dish that extends from 0" to 1 1/2" at the center. The problem is he needs that slight curve on the outer edge. The only way I could get it, or close, was create a 28" circle with a dot in the center and then use a 2 rail sweep. That created the correct outside edge but gave me a raised center. There must be an easier method.

Thanks

Aaron
aaron1869
Vectric Apprentice
 
Posts: 13
Joined: Thu Oct 01, 2015 1:52 pm
Model of CNC Machine: piranha

Re: ellipsoid

Postby FixitMike » Sat Jun 02, 2018 4:26 pm

Try the moulding toolpath. With this bit: http://www.rockler.com/rockler-flattene ... 2-in-shank it will be much faster than using a 3D toolpath. edit: Oops, I think this will leave the raised spot.
2nd edit: Here's the solution: viewtopic.php?f=2&t=26332#p188919

Or add a small pocket to the center to get rid of the raised center.

Also, this tutorial should include the information you need, even though the emphasis is on two sided cutting. https://release.vectric.com/clipart_bowl/

Or, search the forums for "bowl" to see what else pops up.
Good judgement comes from experience.
Experience comes from bad judgement.
User avatar
FixitMike
Vectric Wizard
 
Posts: 1395
Joined: Sun Apr 17, 2011 5:21 am
Location: Renton, WA USA
Model of CNC Machine: Shark Pro Plus (modified)

Re: ellipsoid

Postby aaron1869 » Sun Jun 03, 2018 8:08 pm

A bowl profile will not work.
aaron1869
Vectric Apprentice
 
Posts: 13
Joined: Thu Oct 01, 2015 1:52 pm
Model of CNC Machine: piranha

Re: ellipsoid

Postby aaron1869 » Sun Jun 03, 2018 8:45 pm

The solution was easier then I thought. What I initially did was correct. All I needed to do was drop the model 1/8" below the top. The bit has just enough curve to create an ellipsoid.
aaron1869
Vectric Apprentice
 
Posts: 13
Joined: Thu Oct 01, 2015 1:52 pm
Model of CNC Machine: piranha

Re: ellipsoid

Postby TReischl » Mon Jul 09, 2018 12:22 am

The last I knew an ellipsoid was a deformed sphere? Scaling done along one or more of the axis. If there is no scaling, then the object is a sphere. I suppose you could say that a sphere is a special case of ellipsoid.
http://www.tedreischl.com

Low Profile CNC Router Vise
User avatar
TReischl
Vectric Wizard
 
Posts: 2073
Joined: Thu Jan 18, 2007 6:04 pm
Location: Leland NC
Model of CNC Machine: 8020 Build 48X36X8 RP 2010 Screenset


Return to Aspire - Tips and Tricks

Who is online

Users browsing this forum: No registered users and 7 guests