Feedrates when linking between slice.

[huskermcdoogle]

Morph is a pretty slick toolpath.  I agree with Ron on that...  But I need some advice.  What am I missing for controlling feedrates in the slice linking.  I have it set to blend spline currently and this helps the machine slow down, but I am getting gouging as it is a gantry router and I am running 15000mm/min.   AICC isn't for some reason recognizing the blend spline for what it is and isn't slowing the machine down enough.  Maybe I need more control options, but for now, can it be controlled through either toolpath parameters, or the post?  I am guessing the  post might be one way to tackle it as the nci shows 50 and as the cutpos status during linking and the last retract.  But I am guessing control flags would be a better way to look at this in the post.

[Colin Gilchrist]

What are you asking Husker? Are you trying to change a feedrate somewhere?

There is a parameter for outputting a different feed value for the link move. Is the value changing in the NCI?

[crazy^millman]

Have you looked at retract to feed distance or rapid distance. Blended spline in some cusses will gouge the part like you are saying. Better to use lead in/out at each pass and get away from the part. You can use blended spline if you are using extend on the cut parameters where you are using them to get the tool path motion off the part. Blended spline without them will move one place to another at the edges of the part if it is not extended past the surface then I would expect to see what you are seeing. Some machines have rapid motion that doesn't dog leg. They have full 5 Axis rapids capability where they move in rapid just like they do in feed rate, but most machines don't have it. The machines that do it is pretty amazing to watch. Is something like it in the sample file you sent? I will look at it Monday and give you my thoughts. I don't think the CMS machines have this option, but without getting the specifics from the machine builder I can't be 100% sure.

[huskermcdoogle]

Ron/Colin,

Mostly yes I am looking to control the feedrate during the slice link move, whether it be direct, blend spline or whatever.  I can use the feed percentage to control the lead in/out, but then it bumps back up to 100% for the slice link and causes a vibration which still hasn't settled down by the time the machine enters back into the part, hence my gouging.  I have come to believe there is an issue with the y-axis on the machine and will be getting a tech in to help find it, I am stumped on that front.  After working on the phone with them a bit, we are leaning on the following in order:  Y gearbox (master or slave), Linear guides, backlash (<.025mm currently), cable issue, amplifier.   I did a ballbar test yesterday, and the Y was VERY noisy in comparison to X (10x or so noisier). I have to get them in to help us repair the c brake on our other machine anyway (did anyone say big job?).  So hopefully we can figure it out during the same trip.

As far as 5ax rapids, the machine is setup to linear interpolate rapids in G43.4.  Pretty slick feature for sure.  Overall, I think CMS did a decent job integrating the machine, just wish I had more look-ahead, and nano-smoothing 2.  I think it would help me tremendously on cutting down some cycle times, and end up reducing wear and tear on the machine.  I am not convinced that the machine issues I have now are a result of not having these items or what I do have for options setup better.   Plus training on my part on how to optimize my programming for what options that I do have.

Ron,

I don't have any moduleworks paths that would require linking like I described.  Operation 18 uses a blend spline, but it is just an old surface finish blend path,  I would have thought that it would slow down to the plunge and retract rate as I have the checkbox checked for that in gap settings, but apparently it doesn't have an effect.

Thanks,

Husker

[huskermcdoogle]

X613.675 Y-13.107 Z21.54 A202.879    -   cut
X469.951 Y-14.432 Z19.837 A200.989 B-.846 F14999.76
X469.642 Y-14.436 Z19.845 A200.989 F2100.   -  lead out
X469.335 Y-14.441 Z19.871 A200.989
X469.03 Y-14.445 Z19.916 A200.989
X468.728 Y-14.449 Z19.981 A200.989
X468.431 Y-14.454 Z20.065 A200.989
X468.14 Y-14.458 Z20.169 A200.989
X467.932 Y-14.461 Z20.256 A200.989
X467.749 Y-14.512 Z20.293 A201.145 B-.848 F14150.95 - blend spline
X467.579 Y-14.546 Z20.328 A201.291 B-.849 F14116.19
X467.498 Y-14.557 Z20.344 A201.361 F14089.22
X467.42 Y-14.565 Z20.359 A201.428 B-.85 F14089.92
X467.345 Y-14.568 Z20.373 A201.494 B-.851 F14043.27
X467.272 Y-14.567 Z20.387 A201.558 F14027.91
X467.203 Y-14.563 Z20.399 A201.621 B-.852 F13958.57
truncated
X467.75 Y-12.585 Z19.406 A205.004 B-.878 F14396.34
X467.932 Y-12.628 Z19.295 A205.158 B-.879 F14425.78
X468.141 Y-12.625 Z19.208 A205.158 F2100. - lead in
X468.432 Y-12.621 Z19.105 A205.158
X468.728 Y-12.617 Z19.02 A205.158
X469.03 Y-12.613 Z18.956 A205.158
X469.335 Y-12.608 Z18.911 A205.158
X469.643 Y-12.604 Z18.885 A205.158
X469.951 Y-12.6 Z18.878 A205.158
X613.666 Y-10.662 Z21.056 A205.302 B-.881 F15000. - cut

This is a snippet of code.  cut, leadout,blendspline, leadin.   Doesn't matter what type of slice link I use, it does the same thing with the feeds.   The feeds on the blend are wonky because I am calculating feed in the post with A moves as I don't have TCP setup on the A.  the machine is setup for B/C kinematics.  

NCI refelcts the same here, though the cut flag and control flag shows it as lead off/contour end until the lead in.  Feeds are changing in the NCI same as above.

 

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