Il 12/09/2010 20:44, Andy Pugh ha scritto:
> On 12 September 2010 18:09, Kirk Wallace<kwall...@wallacecompany.com>  wrote:
>
>    
>> I'm wondering, for this application, if it might be better to build the
>> axis machine, then by hand, push the ball through the desired path
>>      
> Pushing strings onto pulleys is notoriously difficult though :-)
>    
:)
too much for my desires!!! ..but, one thing that i do is just (after 
zero all axis) to jog manually the ball to a desired position, than 
write down by pencil, and so on, then in 3dsmax i draw a box like my 
real space, and put the XYZ positions pencil-recorded as the spline 
start/end.

Want to thank everybody for interest.
than, as Brian suggest is interesting, but i really cannot know the 
formulas of the arcs i'm drawing.
also writing by hand the acceleration like g1 f100, g1 f150, g1 f220, g1 
f400.... you know, the show is like 5 minutes of a volleyball doing 
maybe 80 arcs in the air!! cannot write all by hand!! so, i think i'm 
going to work with the little segments way, increasing in lenght as i 
want the speed to accelerate..maybe is the fastest way of writing, cause 
3dstudio will work for me!

basically, there are two reasons why i need this now:
1) immagine the ball flyng at 30mt/min in one direction, and then 
suddenly the direction become opposite. the ball bounces for the 
'impact' (sorry for my poor english..) and the stepper motors loose some 
step.

2) tryed to use in the .ini file a slow acceleration, but using that it 
return me error when i jog in world mode. i realized that the slower is 
acceleration, the slower is the jog speed that i can reach without 
errors in world mode.

any other suggestions, especially for the point 2?

thanks again, davide.

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