Re: [Emc-users] How to specify rotational speed (4th axis)

[Jon E. <el...@pi...>]

Igor Chudov wrote:
> So I have this rotary table for 4th axis.
>
> If I specify a rotational move in conjunction with a move in coordinae axes,
> like this
>
> G1 X1 A25 f1
>
> then the rotary move is timed to coincide with the dimensional move.
>
> But f I specify
>
> G1 A360 F1, the speed is ignored and the rotation occurs at the highest
> speed. Is there some way to specify a speed of rotation alone?
>   
Yes.  I tried to get EMC2 to include rotary axes in the velocity 
calculation, but was overruled.
So, you have to use inverse time mode, G93, to specify the time the move 
is to take.
The deal is if you are going to include the rotary axis in the feed 
velocity, the radius needs to
be taken into account.  G code doesn't formally specify this, so EMC 
would have to ASSUME
that in the active coordinate plane (G17 - G19) the vector distance from 
zero would be the
radius.  That was too big an assumption for the purists, so all angular 
axes have no feedrate.


Jon