> From: bodge...@gmail.com
> Date: Sat, 6 Jul 2013 20:43:53 +0100
> To: emc-developers@lists.sourceforge.net
> Subject: Re: [Emc-developers] "Open" Development
>
> On 6 July 2013 20:32, Chris Morley <chrisinnana...@hotmail.com> wrote:
>
> > infinite jerk is impossible for a machine to produce movement for.
>
> I am not sure that is necessarily true. (unless you really are talking
> about elastic deformation of the machine parts)
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
Can you explain your reasoning?
Just as speed can not be instant nor acceleration, how can jerk be instant?
Or are you saying the practical difference is so small that it's negligible in
all but the highest performing machines?
I do understand that each higher derivative returns less benefit.
It's just hard to qualify what is worth the effort.
I have seen graphs showing the difference between limited and unlimited jerk
movements, but I certainly have not done real world test myself.
and yes I did include physical deformation when I said it's impossible for a
machine
to move with infinite jerk. which again I understand would be probably
impossible to
measure on a low performance machine.
I guess it really comes down to at what performance machine does jerk limitation
show real benefits ?
And I still don't see why one would want to turn off jerk limiting for some
machine movements.
Interesting discussion.
Chris M
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