Re: [CAD_CAM_EDM_DRO] Re: water jet cam

afogassa wrote:

>
>Hi Peter,
> I do have deskcnc and it's good enough for this, but water jets
>needs a good cam that can look way ahead and predicts what is going
>to happen and than starts to adjust the feed rate before it gets to
>a corner or radius to compensate for Jet lag doing that manualy
>would be a pain if not impossible.
> Got a quote from PEPs and it runs at 10K US$ (ouch !!)
>I've being thinking about getting a working G code, than work this
>out on excel to adjust the feed rate.
>
>

Why would the CAM be doing the lookahead? Why can't the CNC control
handle this? Normal lookahead, only worrying about machine acceleration
is done in the CNC control, as the acceleration is constant (a property
of the
machine) and doesn't scale with feedrate override.

I think EMC could be adjusted to handle this. It would need a different
acceleration parameter for cutting vs. non-cutting moves, and that cutting
value would need to be changed for the material and part thickness.

Jon