Inverse Time feed rate

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Inverse Time feed rate

Postby natholego11 » Mon Mar 24, 2014 11:01 am

I have run a Smithy 1240 CNC with a 4th axis rotating around the x-axis, when I post my code its is giving me a constant feed rate of 12IPM, when X,Y,Z, and A axis move together or anything with the A axis, the rotary head will move at the proper feed rate. The problem exist when the machine performs just an A axis rotation, the feed rate Drops dramatically, though the F value stays the same, am I not inputting the feedrate correctly? or am I supposed to use a G93? If so where can I put in the Diameter of the material for it to calculate the speed for the A axis?
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Re: Inverse Time feed rate

Postby MecSoft Support » Mon Mar 24, 2014 4:36 pm

VisualCAM outputs linear feedrates for all 4 axis toolpaths. You can check if there are any settings in your controller that would convert linear to angular feedrate for A axis rotation.
You can specify a scale factor under Angular Feedrate Value in the post processor. This is under the feedrate tab in your post processor generator. Specifying a scale factor will scale the feedrates by this factor for all 4 axis toolpaths.
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Re: Inverse Time feed rate

Postby natholego11 » Mon Mar 24, 2014 6:27 pm

I see where I can put in the scale factor, but when I put it in, it outputs a feed rate for the entire movement, whether it be a linear move or rotational. So if I put in a F10 the xyza moves at 10IPM but when if its just an A movement it moves I believe at 10DPM and not IPM,

N1 G01 x1.000 y1.000 z1.000 a90.000 f10
N2 G01 x1.000 y1.000 z1.000 a0.000 f10
N3 G01 x0.000 y1.000 z1.000 a90.000 f10

If I ran this on my current machine, Smithy 1240, N2 would take about 2 minutes to complete, but N3 would take about 1.5 sec. shouldnt the posted code read something like:

N1 G01 x1.000 y1.000 z1.000 a90.000 f10
N2 G01 x1.000 y1.000 z1.000 a0.000 f200
N3 G01 x0.000 y1.000 z1.000 a90.000 f10

where N2's feed rate jumped up because it is just a rotational movement.
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Re: Inverse Time feed rate

Postby MecSoft Support » Thu Mar 27, 2014 11:42 am

As VisualCAM outputs linear feedrates for all 4 axis toolpaths, specifying a scale factor will scale the feedrates by this factor for all 4 axis toolpaths (linear and angular).
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