I have seen such S-shaped velocity curves like this: 
http://www1.adept.com/main/ke/data/controller/smartmotion_developer/images/S-curve%20profile_575x281.gif
which is even slower than simple speed curve in case main sloap is the same.

In the picture attached 1st curve is like turbocnc does, 3rd is simple 
(LinuxCNC), 4th is S-shaped and 2nd is like it might look for stepper motors 
(provided that velocity starts from zero) because their torque at low speeds 
is higher.

I remember that OEM controller has such parameters like axis starting 
velocity, axis acceleration, and some parameter for common acceleration when 
several axes are moving simultaneously in curve.

"Przemek Klosowski" 
<[email protected]> wrote in message 
news:CAC=1GgGX3bv3vO=xLStkk2Frc9fk0nJ9M5N-g+q-an5NduVK=w...@mail.gmail.com...
> On Wed, Apr 4, 2012 at 3:00 AM, propcoder 
> <[email protected]> wrote:
>
> Is it possible that your old controller used S shape speed profiles,
> i.e. it started by limiting acceleration to  600m/s2 but then used
> higher acceleration? I seem to remember that  LinuxCNC uses
> trapezoidal profile, i.e. the initial acceleration is never exceeded,
> and the speed linearly ramps to max speed
> 



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end



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