David, what package did you use to draw the pictures? Looks fine.
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I use AutoDesk's Autosketch Release 7.
It's a 2D CAD program, fairly complete. It takes
quite a bit of learning, as does any CAD program,
but I was highly motivated because I needed
an inexpensive CAD program for some of my
projects. I.e. I needed to draw real or proposed
objects and take measurements from the models, or
to see how things fit together. Although any
highly-capable drawing program takes a lot of
learning, some of the non-CAD programs (CorelDraw,
Visio) present a more gently sloped learning
curve, but you cannot do CAD with them. I have
been using Autosketch for four years, and I think
I know how to use most of its features. It seems
to be reliable and have very few bugs, but does
have some non-intuitive behavior that can be a bit
of a problem until you are familiar with it. Once
you have some skill with it, you can draw up ideas
very quickly, but it does take time and motivation
to acquire that skill. (Again: as does any CAD
program). I'd like to have 3D modelling, but I
don't feel I can justify the huge expense of it.
David Delaney, Ottawa