tomp:
> Pete I have tables I developed for gr/st using 3 grades of graphite. Tables
> are sequences of on off peak selected by contact area. You choose by area.
> Then end the sequence at the desired finish. These belong to me. Not
> proprietary. Will be PD if license is good for community. Else I just give
> away
I have a scheme in linuxcnc to open the table file then select the next power
stage and set the hardware . its simple mcode using python.
I will post tables and mcodes soon. <
That would help a lot. There is no point in re-inventing this stuff.
The steel hasn't changed and the Poco Co. claims their formulations have not
changed so the tables should be good.
> I will try to convert to canned orbiting cycles for linuxcnc
if I ever get the sine cosine gen to play nice with edm gap
control. We COULD. have circular spherical and rectangular
orbits automated thru the tables. I don't have these motions
Good yet but expect it is possible in HAL.<
This would be nice to have. Until then, how about programming
off-line with circle-splitting to shapes of 16 or more sides? Overcut values
are small, typically less than 0.25mm, so it's hard to see the difference
between a circle and circle-splitting. I point this out so we don't get
distracted by low priority tasks and leave the high priority work unfinished.
Plenty of additional work will probably be uncovered once the first system is
up and running.
Pete Gruendeman
--------------------------------------------
On Fri, 3/4/16, tjtr33 <[email protected]> wrote:
Subject: Re: [Emc-developers] EDM gap control (Control parameters)
To: "Pete_Gruendeman" <[email protected]>, "EMC developers"
<[email protected]>
Date: Friday, March 4, 2016, 8:22 PM
Sent from my BLU smartphone device
Pete_Gruendeman <[email protected]>
wrote:
Hi Nicklaus:
Someone more knowledgeable that I
will need to tell us about the pulse generator frequencies
that are used under various burn conditions. I am of
the opinion that the servo response does not need to be
faster than that pulse frequency.
Pete I have tables I developed for gr/st using 3 grades of
graphite. Tables are sequences of on off peak selected by
contact area. You choose by area. Then end the sequence at
the desired finish. These belong to me. Not proprietary.
Will be PD if license is good for community. Else I just
give away
I have a scheme in linuxcnc to open the table file then
select the next power stage and set the hardware . its
simple mcode using python.
I will post tables and mcodes soon.
Can you tell us what costs are of servo
control at 1kHz and 40 kHz? Hardware or processor time
costs?; proprietary versus public domain software?
While sinker EDM primarily uses Z motion, it
is by no means exclusively Z
motion. Many projects use the other axes,
either part of the time or all of the time. The motion
control for all the axes needs to be equally responsive as
long as one or more users operate on more than the Z
axis. AFIK Z-axis only motion is
appropriate for hole popping EDMs.
My macros for heidenhain asked operator for the tool axis
and reference position . operator supplied distance from ref
to move over clamps then how close when power on and final
cavity depth. This allows cuts in xyz in plus and minus :-)
I will try to convert to canned orbiting cycles for linuxcnc
if I ever get the sine cosine gen to play nice with edm gap
control. We COULD. have circular spherical and rectangular
orbits automated thru the tables. I don't have these motions
Good yet but expect it is possible in HAL
Tomp tjtr33
--------------------------------------------
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