Re: [CAD_CAM_EDM_DRO] Machine mounted Tachometer with Surface Meter Per minuteThis

On 09/11/2010 05:01 AM, Danny Miller wrote:

> Oh yeah there's also gonna be a limit to a Hall/gear tooth sensor
> response time. A decade counter to lower the pulse count won't fix
> this. If it's too fast, the sensor won't have time to fall after one
> tooth leaves before the next tooth rises and it can't find a pulse out
> of that. 30K RPM * 6 teeth in a collet= 180KHz. Pretty fast to ask
> for. Especially since the collet "teeth" aren't very deep so its signal
> level might not drop that far between peaks to begin with even when
> going slow.
>
> Danny
>

Ah, Danny, you missed something. 30K RPM == 1/2 KRPS. Minutes vs seconds.

100K RPM * 6 teeth / 60 seconds per minute = 10,000 PPS, within the spec
range of Allegro's automotive sensors.