I have used AutoCAD on and off for the last couple of years and can get most CAD designs completed using it, by hook or crook. Although, not always in the most pleasing of timescales, which really doesn't matter that much as they are generally for non-commercial purposes. 123D Design is a free CAD alternative, although not entirely free, that is also used for 3D modelling.
Today it seems that a lot of the features of AutoCAD have been incorporated into 123D Design. Hence, from what I have read the core engine used to drive AutoCAD is in fact the same one used in 123D Design. To test if this is the case I decided to undertake my next 3D design project using 123D on Mac OS X and make my efforts the subject of this and subsequent posts in this category.
If you like a blog post with a happy ending then this blog post has one, but only just. This particular post is about me against Yosemite (10.10) when attempting to install Bugzilla. This time I won, but barely and the victory wasn't pretty to see. All the same I won albeit with a complete lack of composure at the end.
With two big projects coming up I just had to get Bugzilla working, no matter what. So finally getting it to work was more out of desperation than anything else. Although, because it took so long it did mean that I was not able to begin some other work, as planned. Anyway enough of the waffle here is the story, as it unfolded.
Every now and again the digital design engineer has to completely leave his (or her) comfort zone and enter the occult of analog design engineers. It is in this world that digital design engineers, used to making yes or no binary decisions, are presented with a multiple of answers all of which, or none, may be correct. It is in this blurry and murky world that any type of help, to corroborate a design, is most welcome.
As part of designing a servo controller board for the 17 DOF Robot (Using FPGAs) Project I had to enter such a world. However, rather than approach the design with Wigi (Ouija) board to hand, to confirm my results, I simulated the circuit design using the electronic equivalent or a Software Program with Integrated Circuit Emphasis, otherwise known as SPICE. The installation of LTspice IV on Mac OS X (Yosemite 10.10) is the subject of this blog post.