RE: [CAD_CAM_EDM_DRO] Cnc PCB drilling machines z axis linear pot

A potentiometer will last a long time if used regularly. They tend to get
noisy faster if left unused for extended periods. I know a lot of fuel
injection systems use a pot on the end of the throttle plate shaft to sense
throttle opening and the engine compartment is a rather harsh environment.

> -----Original Message-----
> From: Peter Seddon [mailto:peter@...]
> Sent: Monday, December 10, 2001 4:18 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Cnc PCB drilling machines z axis linear
> pot
>
>
> This is somewhat surprising as potentiometers are:
> 1. Prone to go noisey
> 2. Diffiuclt to seal against dust etc
> 3. Are contact devices and thus liable to wear
> 4. Are analogue devices and thus less accurate
> 5. The signal requires conversion to a digital signal before
> it can be used
> (unless the system is fully analogue).
>
> The only advantage would be cost
>
> Regards Peter
>