13 Dec
2004
13 Dec
'04
4:25 p.m.
> Old
elevators. Lots of old elevators.
Patrick> And, lots of not-so-old elevators.
Some machine tools, too.
I remember seeing a large planer -- 12 foot stroke, roughly -- that
used a DC motor for the bed drive. The idea was that you would get
the back & forth motion of the bed by throwing the motor from forward
into reverse or vice versa at each stroke endpoint.