An odd thing about CAD...

(aside from blank messages :-)

I use DeltaCAD, a simple 2D replacement for the traditional T-square
and triangles, to make patterns for parts, from a 56" rib to itty-bitty
things for home-made clocks, tiny steam engines and similar stuff. And
I talk about it, too. If you hope to share information at a distance
you need good drawings and a simple CAD program is miles ahead of
old-fashioned drafting.

That produces a lot of mail, almost all of it from guys telling me why
they DON'T use CAD, or at least, not DeltaCAD. Such as the message I
received last night in which the feller explained that the reason he
didn't like DeltaCAD -- and only had it so he could print out my
drawings of VW conversion parts -- was because he was accustomed to
working in fractional inches.

"In the time it takes me to convert 27/64ths to decimal and get it
typed in," he wrote, "I could have drawn it a dozen times with a
drafting scale."

I had to think about that for a while. A private answer would have
been more polite but if one person thinks DeltaCAD can't handle
fractional inputs then others might, too. And the truth is, it handles
them just fine. Want a line 27/32nds in length? Then select the LINE
function, indicate the point of oirgin with your pointer and type in
27/32.

One and nine-sixteenths? Then type in 1 (space) 9/16. Two feet, three
and three-sixteens would be entered as 2'3 3/16.

I can appreciate the feelings some guys have when they're faced with
converting a 1920's drawing into a digital format. Back then,
everything was in fractions of an inch and American Wire Gauge, neither
of which is in common usage today. But DeltaCAD, with which I have no
relationship other than as a satisfied customer, really IS handier than
your T-square, triangles and drafting scale. The odd thing is that so
few guys my age think so and I really can't understand why. The
complete manual is only 218 pages long and most of that is white-space.
In fact, compared to other CAD software DeltaCAD is so simple most
guys start turning out usable drawings without ever reading the manual.

-R.S.Hoover