Giles G-200 – Wheel Pants, 3D PDF Exports

I figured I would start with something easy on the Giles surface modeling, since I haven’t done any really intensive CAD work in about a month.  The wheel pants seemed like a great place to start, since they are a stand alone surface that does not have to directly integrate with the cowling.  I started … Continue reading

Giles G-200 Cowling – Digitization Complete

Well after about two and a half days of work, the digitization is complete on the Giles.  This has been my most extensive digitization project to date, due to the fact that it’s not just a cowl I need to make.  Since the wing root fairings and the gear leg fairings intersect the cowling, they … Continue reading

Giles G-200 Cowling – Onsite Digitization

Well the real “meat” of the Giles G-200 cowling project has begun.  I flew out to very very hot Sonora, California yesterday morning so I could scan the aircraft and engine.  It was an absolutely beautiful flight from Watsonville to Columbia – very still air, great visibility and very little traffic.  I removed the back … Continue reading

KevCAM Part 3 – Polysurfaces, Rings, Script Shortcuts

So now it’s time to start extending these basic concepts to more real world situations.  Everything we’ve done thus far has dealt with one single surface.  What if we have a polysurface instead of one single surface?  Let’s say we take our half pipe idea, and make it more like a s-curve: Now, you might … Continue reading

KevCAM Part 2 – Controlling Toolpath Orientation and Stepover

So if you’ve read through my first post on KevCAM you get the general idea on how the method works.  On this post I’m going to show you how to control the stepover of the toolpath, and the toolpath orientation to your mold.  Sticking with our very basic “bent half pipe” mold from earlier, the … Continue reading

KevCAM – A FlowAlongSrf Rhino Hack for CAM Toolpaths – Part 1

I use a program called madCAM for all my CAM toolpath generation.  I like it very much and in general it works very well for what I do.  Since I only have a 3-axis machine, I have the entry level version which sells for $750.  I found their claim that you could download the program … Continue reading

T-Spline Tip: Defining Regions For Conversion

While Skype-ing with Matt Sederberg at T-Splines today, he turned me on to a feature of T-Splines that I’d never even knew existed, one that I think is very useful to what I do.  We were chatting about some bugs I’d encountered on the cowling file for the Giles G-200, which they are addressing.  I … Continue reading

A Better Way to Draw Airfoils in NURBS Modeling Packages

This post, and the methods I describe below stemmed from my interest in surface modeling aircraft structures in Rhino3D, and the problems I encountered along the way.  While this method is especially crucial to those using T-Splines, anyone drawing airfoils using a NURBS based modeling package will find the information interesting.  While the commands my … Continue reading

Cosine Spacing Plugin For Rhino

As I outlined in my post on my method for drawing airfoils in Rhino, the curves should be divided using a cosine spacing, rather than the typical division methods provided in Rhino.  I had a friend of mine whip up this plugin for me, and so it’s a little rough around the edges, but it … Continue reading

T-Splines Article For Desktop Engineering

I wrote and article for Desktop Engineering about the limitations of NURBS based modeling packages and how T-Splines solves many of these problems.  Check it out if you have a few minutes.