Charles Henry czhenry at gmail.com
Tue Aug 7 21:07:54 CEST 2007

> At least it seems to be physically impossible to hit the hand, only a
> finger could be cut off.

It doesn't seem like you could cut off a finger, with the blade
running lengthwise.  No doubt it would hurt a lot, though.  This is
all a bit morbid.  Oh, well
I would trust Pd and the sensors in this situation (unless some jerk
with a laser pointer was nearby).  I see a little bit of wobble in the
mechanism, where it's conceivable that even if the computer/sensors
function correctly, you could still get hurt.  When you rachet up the
speed on this machine, that wobble (a resonance) is going to
It may be better to go with pneumatics for the knife's downward
stroke, since there's fewer modes of vibration that way.

you know what they say...build a better knife-hand-chop-bot and
they'll beat a path to your door

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