Re: Max feedrate

Christ L wrote:

"No, You might be thinking harder than you really have to.... It is
much
simpler.... Those max rates in the General section are simply speed
"limits". One is the default for when you do a feedrate POINT move
from
the Point menu, the other a limit on how fast Arcs can run no matter
what the FXX.X setting in the Toolpath."

Hi Christ,

The "point move" you mentioned for Flashcut, it appear to me to be
something like MDI? where one may input x=4, y=5, Feedrate=20

Wouldn't that be the same as a MDI command G01 x4 Y5 F20, and that
would be linear interpolation?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, CL <datac@l...> wrote:
> andrewyslee wrote:
>
> >Hi,
> >
> >In Flashcut feedrate/ramping setup, one has to input values for
the
> >max. feedrate for the x-axis, y-axis and z-axis. Then there is
> >another "general setting" one for "max arc feedrate and one
for "pt.
> >feedrate - linear". Am I correct to assume that this is the
overall
> >linear interpolation max feedrate?
> >
> No, If I am hearing you correctly, Those Feedrate settings
in "GENERAL"
> represents the following: When and only when you do a "POINT"
move, and
> the rate is set to Feedrate, The setting acts as the "default" for
that
> move. That is the dropdown where you choose between rapid and
feedrate.
>
> Max Arc Feedrate is used to limit G02 and G03 feedrates to the
setting
> you type in. In other words, It will allow a machine to have a
*maximum
> limit* for Arcs. The Feedrate in the toolpath will be honored
unless the
> rate you type in is exceeded. Many find that Flashcut will actually
run
> thru mixed geometry when G02-03 Arcs are not used and short line
> segments are instead. There is very little noticable difference,
but it
> depends on what you are doing. If no G02-03
>
> > If so, I wonder if there is some
> >connection between the max. feedrate for the x, y, z feedrate and
the
> >max. linear interpolation feedrate
> >
> >Eg. if max feedrate for
> >x = 15 ipm
> >y = 15 ipm
> >
> >Should one set the max linear interpolation feedrate to be also 15
ipm
> >or since linear velocity may be a vectorial addition of the x
> >velocity and the y velocity, it should be set higher, example,
> >15 ipm X squareroot 2 or something like that?
> >
> >Thanks
> >
> No, You might be thinking harder than you really have to.... It is
much
> simpler.... Those max rates in the General section are simply
speed
> "limits". One is the default for when you do a feedrate POINT move
from
> the Point menu, the other a limit on how fast Arcs can run no
matter
> what the FXX.X setting in the Toolpath.
>
> Point Feedrate - Rotary is the same... How fast you want it to turn
when
> doing a point move.
>
> The one setting most are confused on is the Continous Contouring
> Feedrate setting.... That you should start with at the same spot as
your
> Max feedrate setting per axis, then move it up for smoother
continous
> motion, getting it as high as possible while still maintaining
position.
> It in effect does the math necessary to decide whether to ramp or
not
> betwenn line segments.
>
> Chris L