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Line torus intersection code dump
Hm. This image didn’t come out quite as badly as I would have expected. Maybe I’ll do more like this.
In the non-axial projection function for a general cutter shape, it’s necessary to find the intersection between a line and a torus — for the case of a bull-nosed cutter against one of the [...]
The non-axial projection subjection
You don’t begin a project that will take the rest of the year and more without evading it as long as you can. Finally I’ve begun to break ground on this.
Background: Almost all industrial algorithms for generating toolpaths for 3-axis machining are based on the Drop Cutter function, where the tool is lowered along [...]
Offsets of triangulated surfaces
There’s an annoying obsession with speed which is something to do with getting sales — it’s the one and only property of CAM software which users bother to perceive when shopping around.
I always thought that as long as the software generated toolpaths faster than the machine could run them, we’d be ahead. [...]
Pencil overthickness
How do I get any work done? I don’t. I’ve been getting mightily pissed off with it, which is why everything is a distraction. If it wasn’t for this UN website, I’d be fixing every hole in every sock in my drawer just to avoid doing what I’m supposed. It’s like [...]
Two months of drudge
I just saw Becka off on the plane which she promises will be the last flight she will ever take: going 8 weeks away to explore caves in China (while I continue to work on the cave exploration software).
The last flight I took was to China in 2005, and before that in 2002 [...]
Cambridge interlude
My two weeks in Cambridge is now complete. The first week was getting the drop-cutter code into a good enough state, and the second was spent getting distracted by people when I was really trying to work on Tunnel. I was keeping house for my 94 year old grandfather who was getting radiotherapy [...]
Galaxy road south
I’ve suddenly wound up in Cambridge for two weeks to keep house for my grandfather as he gets radiotherapy treatment at the large hospital on the other side of town. They send a taxi over every day. If I’m lucky there might be room for me to go in it.
I’ve got [...]
Drop cutters Tuesday
Now the drop cutter function is enabled to handle horizontal edges as well as vertices of the surface. It’s the trivial case, because you take the closest point in the edge to the cutter centre and send that to the drop cutter on vertex routine.
Most of the day was spent getting rid [...]
First drop point results
Beginning with the easiest, I’ve done cutter location against a set of points picked from a model. I’ve learnt my lesson and done it for the uncommon tapered cutters from the start, rather than going for the easier cylindrical type of cutter, and then having to fit this feature into the code later. [...]
Drop cutters Monday
I’ve got quite a few distractions this week, so it’s not realistic that I will be able to completely rewrite the cutter location code by Friday to be fast, but I’ll have a go. I started working on it last night and have the initial interface of it sorted out.
The main innovation [...]