IIRC emc was conceived as a vehicle to test intercommunication between
processes and as such higher level features such as lookahead,
smoothing, etc were not part of the master plan. In fact emc would not
have had stepping if Matt Shaver had not requested it.
Now on to the real subject of this email. Is there a user that has the
resources to test linuxcnc vs tiny g for smoothness vis a vis jerk. I
suspect that tiny g does not have integrated tools to do this so simply
milling under extreme conditions may be the only way to access the
utility of its jerk component.
Ideas, comments.
Ray Henry used to talk about tuning by milling before we had good tools
in emc. It could also be that he was dealing with analog controls. ;-)
Dave
On 8/23/21 5:51 PM, andrew beck wrote:
Andy do you know what the tormach uses for more than 3 axis path blending?
On Tue, Aug 24, 2021, 11:11 AM andy pugh <bodge...@gmail.com> wrote:
On Mon, 23 Aug 2021 at 21:27, andrew beck <andrewbeck0...@gmail.com>
wrote:
Just had a look at tiny g looks great.
I did try to implement a zero look-ahead finite jerk planner for laser
rastering. It was interesting, and I learned a bit.
It is easier the less general you make it.
Ideally LinuxCNC would have a 9-axis finite-jerk planner that handled
arbitrary kinematics with feed-override control.
Tiny-G is a 3-axis (I think) planner with trivial kinematics and no
feed override (AFAIK).
At the moment I would be happy just to see LinuxCNC handle more than
3-axis blending. It's in Tormach.
I have a feeling that kinematics is not a problem in most cases, the
kins functions run fast enough to be used for finite-difference
differentiation / numerical integration.
I am not sure about the more computationally intensive ones, such as
genserkins. (I think that is fast forwards, slow inverse)
--
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912
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