Re: [CAD_CAM_EDM_DRO] Ball-bar Re: Mill retro-fit info available...

ballendo wrote:

> Jon,
>
> How about using an lvdt (or is it ldvt?) as the "length" component.
> Or stacked strain gauges? I didn't realise there was a rotary encoder
> involved for rotation. I thought this was "pulled" from the cnc or
> time based (samples/unit_time.) Wouldn't the length itself, plotted
> against time, define a motion path? (assuming we know what the motion
> is "supposed" to be)

Yes, presumably, you could do without the shaft encoder, but since the
Renishaw ballbars are portable instruments moved from machine to
machine, they need to be self-contained. They may use LVDTs, I really
don't know. Strain gauges would measure force, the idea is to measure
displacement.

Jon