[dorkbotsea-blabber] Motors with limit switches

[Wim Lewis]

On Oct 1, 2006, at 3:51 PM, Paul Holman wrote:
> I need about 20 small motors.  Each of these will need to wind up  
> about 15' of cable.  They should each be able to handle about 20  
> lbs. of load.

The other basic parameter you need to specify is "how fast do they  
need to wind up that 15' of cable?". You can always trade off speed  
vs. force, by varying the size of the drum or using a pulley  
arrangement. So the interesting motor parameter is the torque-times- 
speed product, which comes out as watts or horsepower.

You could try cheapo electric screwdrivers. No limit switches, but  
they are designed to be able to stall briefly without killing  
themselves.  You could sense the stall by looking at the back-emf, I  
guess.