Re: [CAD_CAM_EDM_DRO] 5-Axis with EMC ?

PMeinhard@... wrote:

> Hello Everybody
>
> Thank You Dan , the "EMC in 10 Minutes CD" workes fine , but I have
> some
> questions, perhaps someone can help me.
> At the moment I am building my own 5-Axis mill. I would like to use
> EMC (the
> software is great- the most professional I have ever seen affordabel
> for
> privat use) for it , but is EMC able to interpolate 5 Axis simultan ?
> somewhere in all those Readme and help-Files I read something about "
> 3 axis
> simultan" But if a hexapod workes , 5 axis should be possible.

EMC supports 6 axes in simultaneous motion, but the interpreter only
handles
motion commands in 3 axes at present. Since a hexapod is only an
amusing
toy without a way to tilt the platform, NIST will be adding the
necessary code
to interpret rotational axes and/or more cartesian axes, as well as
handling the
trajectory and kinematics for at least a few standard configurations.

> Somewhere I read that the Output -frequency for Steppers is limitid to
> about
> 5 KHz. Is that wright and is there no possibility to speed it up.?

I think you can go higher than that, but the software-driven stepper is
pretty well
understood to be a dead end road. I am working on a very low cost
hardware
solution that will produce 4 totally independant pulse rates, variable
from 200 nS
to 1.6 Seconds. It needs to have an encoder counter connected to it so
the
CPU can get position feedback. The counter can count step pulses if
there
is no hardware encoder.

> Is this limit also for Servo-Motors ?

There is no practical limit for servos. My encoder counters can go to
330,000
counts/sec of the quadrature signal. (If you need more, just up the
clock
frequency. Somewhere around 10 mega-counts/sec is the limit of this
chip.)
Using the servo-to-go card probably has similar limits.

> What have I to do to get the 4th and 5th axis on the screen when I
> enabled
> them in the Sim.ini (EMC.ini) file ? Has somebody a 5-axis-mashine
> already
> working ? Is there software that supports 5 Axis ?

A half-way 4th axis has been done, but motion can only be commanded
manually, not through the program, due to the interpreter limitations.
As I say, there is work being done on this. Ray Henry or Fred Proctor
may have some comments on the progress in this regard.

Jon