Hi Robert,
as I understand it:
when you program a G1/G2/G3 that moves some linear axes, the F-word refers
to tooltip velocity.
If you also have a rotational axis turning (A axis for example), then the
axis is turned so that it starts and ends at the same time as the linear
axes.
For example:
G0 X0Y0Z0A0, G1 X100 F300 --> that will move from X0 to X100 at 300
mm/min.
G0 X0Y0Z0A0, G1 X100 A360 F300 --> that will move from X0 to X100 at 300
mm/min, and the A-axis will turn from 0 to 360 degrees (one full turn).
The above is only true if the max speed for A is fast enough that it can do
a full turn in the time X goes from 0 to 100 (20 seconds).
If the A axis is slower than that, then the whole move will be scaled so
that the A axis max speed is not exceeded. (say A axis can turn 360 degrees
in 60 seconds), then you get from X0 to X100 in 60 seconds (corresponds to a
F100 not F300).
I am not sure what G1 A360 Fxxx means..
Regards,
Alex
----- Original Message -----
From: "Robert von Knobloch" <[email protected]>
To: <[email protected]>
Sent: Friday, January 30, 2009 3:00 PM
Subject: [Emc-users] 4-axis speed problem
> We have bought a Heiz 3-axis milling machine with a 'roundino'
> stepper-driven rotary table and are using EMC2/Axis version 2.2.5
> installed from the Ubuntu live CD.
> I have it configured based on the step_mm examples and have the 4 axes
> calibrated and working seemingly OK.
>
> I notice that the rotary table can be commanded with 'g1 a(xxxx)' to set
> it spinning and if I set F300 or F500 then it's rotational speed is
> adjusted accordingly (I don't know what F(xxx) means to a rotary table
> as it is not linear - can anyone enlighten me?).
> G0a(xxx) turns at the - somewhat faster - jog speed.
>
> If I issue a 'F300' then 'G1 x15 a3600' (Cut a spiral 15mm major radius
> and 10 turns) then the rotary table turns at what I estimate as jog speed.
> In fact the setting of the F parameter does not seem to influence it at
> all when the motion is combined with X,Y or Z movement, although it does
> when only rotary motion is programmed.
>
> This seems to me to incorrect operation, but it is also possible that I
> have misunderstood something. Can anyone tell me if I am driving the
> machine wrongly or is there a bug in EMC/Axis here?
>
> Best regards,
>
> Robert von Knobloch.
>
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