Great CAD Disasters

I was thinking the other day (always dangerous) about how some things have changed in CAD, yet others haven’t. One of the things that hasn’t changed is the ability of, ahem, shall we say, less than perfect operators to be really stupid. Here’s one example that came to mind.

Many years ago, I worked in an office when Acad was introduced, R2.5 I think. One of the partners decided that this new fangled CAD was the way of the future, so he set about learning by doing it. All very noble, I’m sure.

Anyhow, he was working on a big drawing, weeks of work, all day long. Somebody had said that it’s best to leave computers running 24h per day, so that’s what we did.

Our partner wasn’t a power user, so he typed in every command longhand, e.g. ERASE, OFFSET etc.  This time he mis-typed OFFSET and didn’t notice it.  We work in metric, units are millimetres, so he typed something like OFSET 10000 to get a 10 metre offset. Only thing was, the previous command was UNDO. If you type an unknown command, you got the previous command back, in this case UNDO. So, in effect he undid 10000 commands!

There was the amazing look of horror on his face as he watched his drawing literally unravel before his eyes. A little knowledge is said to be a dangerous thing, so, naturally, the next thing he does is to SAVE the drawing. Not once, but 2 or 3 times. Bear in mind that the computer was not switched off overnight, and this is well before the
days of networks and multiple backups. There was no way around it, he had overwritten all his work with an empty drawing.

As far as I know, he hasn’t touched CAD since.


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