Re: [CAD_CAM_EDM_DRO] Re: UCMI Interface

Jon

I've been using G61 but I would really like to have the continious
motion as it tends to defeat the purpose of having a fast machine.
I will do a little experimentation with the accel. setting and see what
I can do.

Thaks for the info.

Bill

> William Scalione wrote:
>
> > Jon,
> >
> > Lets see if I understand you right.
> >
> > My cnc router will do cuts at 300ipm but I need to slow it down
> > as at that speed corners will be rounded sometimes 1/2" or more.
> > If I change the acceleration numbers in the ini file, will that help
> > with my problem?
>
> There are a couple of ways of managing this. You have the acceleration
> parameters in the .ini file, which should be set pretty close to the max
> acceleration the machine is actually capable of, otherwise the EMC
> will be rounding the corners even more than necessary. So, yes,
> finding the highest acceleration that will not cause problems like
> losing steps or tripped servo amps is the first thing to do.
>
> Then, there is the G61 (exact stop mode) modal G-code, which
> means that the machine is to come to a complete stop anyplace
> where a blended move won't pass exactly through the endpoint.
> This will slow down your program quite a bit, but there will be no
> rounding of the corners whatsoever.
>
> Without the G61, whenever the machine starts to decelerate an axis
> at the end of one move, the other axis begins to accelerate. For
> slow moves, this produces very little rounding. For rapid movement,
> the rounding can be quite large.
>
> Finally, you can change the program so that the ends of each line
> have a several inch section at low speed programmed as a separate
> G-code block, which will give the best performance, as you are
> specifying what you really want the machine to do, vs. allowing EMC
> to guess at it.
>
> Maybe the G61 will work fine for your needs.
>
> Jon
>
>
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