Haas 4th axis with slightly jerky rotation during program using simultaneous a and x

Machine: Haas TM-3P
Rotary: HRT210-2-P3

Lately, I've been working on a cylindrical part that uses both x and a (4th) axes. I am programming in Fusion 360 using the 2D adaptive pocket command and it's generating what looks like a good tool path. I went to do a dry run to see how the rotary would handle it and it did seem to work, but the rotation of the rotary table didn't seem very smooth. It seemed like it was accelerating/decelerating after each line of code. For the part I'm working on, I'm going to need it to be smooth for a nice finish. Just looking at it, and the way it jerks/lags, I know the finish is going to look like crap. On a side note, if I hand jog the 4th axis, it's buttery smooth rotation. This is why I believe it to be a settings/code related issue.

So far, I have scoured the internet and I've tried a few things:

1. Enable G187 P3 - did nothing.
2. Remove G64 from code (disable exact stop) - did nothing.
3. Messing with 4th axis acceleration parameters - didn't have the balls to mess with it (I'm just going to assume they are good).
4. Turn smoothing on in Fusion and set tolerance to ridiculously small amount - did nothing.
5. Enable parameter 315:23 (force all rapid moves to use G01) - did nothing.
6. Insert M11 (unclamp 4th axis) m-code at beginning of program - 4th already unclamped, did nothing.

I've been reading some more and it looks like the High Speed Machining option might help me out with this as it can look ahead in the code - preventing unnecessary acceleration/deceleration between blocks. If this works, I'll be quick to report back.

Here are two videos and a picture to show what's going on. Ignore the fixture currently on the rotary table; it's for another production part unrelated to my tooling job.



Thanks in advance for any help/advice!

You are going to get a billion lines of code trying to do a tool path like that. Haas machines don't do well with in that situation. Do whatever you can to try and decrease the number of lines of code (decrease tolerance, use an alternate style tool path like Flowline, use G187 P1 etc). High Speed option will help.

Yup ^ exactly what he said. The Haas I used to run would jerk and jiggle as the amount of lines went up.It fights for exact positioning and tries too hard. That rotory also hated to be turn(unlocked)when milling,even Haas said something about it not being designed for turning while milling. That's at least what I was told.

for the 1st 5 years we had our 2009 vf2ss with a 210 we did lots of 4th axis work mainly surfacing, never had any jerking problems. we do have HSM.
our parameters were factory stock.
if I recall there was a G code we used to swap the y axis with the A axis(plane). Its kinda like a wrap so to speak( dont know the technical term)I have it written down somewhere I am sure, if I remember I will look for it tomorrow. Basically the Y axis stays put and the a axis(4th ) is the only thing thats moves with Z and A and X moving as necc.
does gear and spline profiles, spiral, text etc etc

finish was always extremely nice while rotating.
if your program is putting out line segments thats one problem why your getting a jerky motion and have very long programs.
There use to be a video on haas explaining on how to do it thats where I got it from.

you can always call the haas guys they will be able to tell you, I am sure someone in here will know how.

Delw said:

for the 1st 5 years we had our 2009 vf2ss with a 210 we did lots of 4th axis work mainly surfacing, never had any jerking problems. we do have HSM.
our parameters were factory stock.
if I recall there was a G code we used to swap the y axis with the A axis(plane). Its kinda like a wrap so to speak( dont know the technical term)I have it written down somewhere I am sure, if I remember I will look for it tomorrow. Basically the Y axis stays put and the a axis(4th ) is the only thing thats moves with Z and A and X moving as necc.
does gear and spline profiles, spiral, text etc etc

finish was always extremely nice while rotating.
if your program is putting out line segments thats one problem why your getting a jerky motion and have very long programs.
There use to be a video on haas explaining on how to do it thats where I got it from.

you can always call the haas guys they will be able to tell you, I am sure someone in here will know how.

Click to expand...

remembered now, cylinder mapping g107
that being said there should be a way to swap your y with your a A axis in your software as well, my software from 2001 does it, so I am sure the newer stuff will.

I have done a fair amount of 4th axis programming over the years. Most of it without cam. Sometimes I find I have to use a G93 ( inverse timing) in like cutting threads and such . It works the axis in a smoother simultaneous movement around the part.

G00 Proto said:

You are going to get a billion lines of code trying to do a tool path like that. Haas machines don't do well with in that situation. Do whatever you can to try and decrease the number of lines of code (decrease tolerance, use an alternate style tool path like Flowline, use G187 P1 etc). High Speed option will help.

Click to expand...

I think you're right. I ended up just running the part because I couldn't figure out a solution to the jerky motion. I wasn't able to tweak the tool path in Fusion to give me fewer lines of code. No matter what I did, there still were thousands just for the wrapped pocket op. I also tried doing a dry run with HSM enabled, but no luck. I've included some pictures below of the part. I think I could have made it look better if I had smaller stepover since I was milling a cylinder with a square end mill. I'll keep playing around with the rotary and tool paths to see if I can get it to run more smoothly.

Try dropping the feed rate. I've been making similar toolpaths in fusion lately, but in stainless. I loaded up an aluminum blank and cranked the feed rate and had similar jerkiness. I couldn't figure it out because my dry run was smooth. So I started bumping the feed rate down and at a certain threshold the pausing stopped.
This was with a 2002 VF3 hrt160 , HSM option , inverse time and smoothing applied.
Not sure what is exactly happening, if I'm hitting the limits of the equipment or the control or the software but going slower sorted it out. And it didn't get gradually better , it just hit a cutoff point where above that it would pause and below it would run continuous .

Draw your part flat ie with x and y, draw a finish pass then offset the finish pass every .010 or less step over, then trim those pass's so you dont cut air.
Then use the g code I mentioned above switch y to A (cylinder mapping g107)
this will change you y axis to a axis movement.
now if you cant draw a arc in your software with out segments than you will have segments if you get g3 or g2s and g01s you will be fine.

Post up some code, and I mean a fair bit of it.

I do tons of work like this on my old ass fadals, no problem.

I have a feeleing the jerkiness you are seeing is a matter of the nc code not being suitable.
What year vintage is your machine?

Need to see the code.

This is mostly just thoughts and a few questions..

And I'd like to see a sample of the code also...

Thought.. A spiral pocket doesn't seem like a code friendly idea when
you have the A axis involved. (I'm assuming part is oriented along the
X)

As your tool is attemting to make a spiral on the cylinder, your X has
to constantly change feed rates to kind of falsify the Y (if that makes sense).

I'm guessing that you are seeing a lot of feed rate changes in your segments..

Who ever said it up there, if you can code it as a wrap, you would eliminate all
that, and it might get rid of your jerkiness..


Another thought. On an old Fadal, it can do a simultaneous 4 axis move,
I'm pretty sure it will even do one with an arc. I know it will do a
YZJKA move, but it will NOT do it fast. About 7ipm if I remember right.

So if you can code so that you are only doing 2 axis moves, that might help,
back and forth instead of a spiral pocket, or at least linear 3 axis moves,
no spirals..

Just tossing some thoughts out.

I have this problem with our 2015 VF3SS and HRT310 4th axis. I had to adjust the tolerance and smoothing so the cam output G02/03 moves instead of thousands of short G01 movements. This machine does not have the HSM option. By contrast on our new 2019 VF5 - regular machine not an SS - but with the HSM option it runs silky smooth without any filtering of the toolpath.

macds said:

Post up some code, and I mean a fair bit of it.

I do tons of work like this on my old ass fadals, no problem.

I have a feeleing the jerkiness you are seeing is a matter of the nc code not being suitable.
What year vintage is your machine?

Need to see the code.

Click to expand...

Here's the code I used:

%
O01001
(Using high feed G1 F400. instead of G0.)
(T2 D=0.5 CR=0. - flat end mill)
(T6 D=0.3125 CR=0. - flat end mill)
N10 G90 G17
N15 G20
N20 G53 G0 Z0.

(2D Adaptive2)
N25 T1 M6
N30 S5990 M3
N35 G54
N40 M11
N45 G0 A11.844
N50 M8
N55 G187 P3
N60 G0 X1.5521 Y0.
N65 G43 Z0.825 H1
N70 T2
N75 G1 A11.844 F303.03
N80 Z0.7254 F400.
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N15740 X2.916 A-25.697
N15745 X2.9231 A-22.414
N15750 X2.9302 A-19.131
N15755 X2.9356 A-15.812
N15760 X2.941 A-12.494
N15765 X2.9463 A-7.885
N15770 X2.9465 A-7.456
N15775 X2.9478 A-3.99
N15780 X2.9485 A0.597
N15785 A6.712
N15790 X2.9478 A11.298
N15795 X2.9462 A15.885
N15800 X2.9455 A17.413
N15805 X2.9428 A22.
N15810 X2.9389 A26.586
N15815 X2.9372 A28.115
N15820 X2.9322 A32.354
N15825 X2.9293 A34.23
N15830 X2.924 A37.288
N15835 X2.9171 A40.345
N15840 X2.9136 A41.874
N15845 X2.9094 A43.403
N15850 X2.8942 A47.989
N15855 X2.8876 A49.518
N15860 X2.8807 A51.047
N15865 X2.8743 A52.26
N15870 X2.8638 A54.104
N15875 X2.8536 A55.633
N15880 X2.8454 A56.802
N15885 X2.83 A58.691
N15890 X2.8165 A60.117
N15895 X2.7828 A63.277
N15900 X2.7731 A64.156
N15905 X2.7648 A64.806
N15910 X2.7587 A65.249
N15915 X2.7298 A67.285
N15920 X2.7213 A67.864
N15925 X2.6999 A69.153
N15930 X2.685 A69.532 F23.063
N15935 X2.6702 A69.119
N15940 X2.6583 A67.888 F27.629
N15945 X2.6541 A66.186
N15950 X2.6546 A62.304
N15955 X2.6551 A58.422
N15960 X2.6555 A54.54
N15965 X2.656 A50.658
N15970 X2.6565 A46.776
N15975 X2.657 A42.894
N15980 X2.6575 A39.012
N15985 X2.6579 A35.13
N15990 X2.6584 A31.248
N15995 X2.6589 A27.366
N16000 X2.6594 A23.484
N16005 X2.6599 A19.603
N16010 X2.6603 A15.721
N16015 X2.6608 A11.839
N16020 X2.6613 A7.957
N16025 X2.6618 A4.075
N16030 X2.6623 A0.193
N16035 X2.6627 A-3.689
N16040 X2.6632 A-7.571
N16045 X2.6637 A-11.453
N16050 X2.6642 A-15.335
N16055 X2.6646 A-19.217
N16060 X2.6651 A-23.099
N16065 X2.6656 A-26.981
N16070 X2.6661 A-30.863
N16075 X2.6666 A-34.745
N16080 X2.667 A-38.627
N16085 X2.6675 A-42.509
N16090 X2.668 A-46.391
N16095 X2.6685 A-50.273
N16100 X2.669 A-54.154
N16105 X2.6694 A-58.036
N16110 X2.6739 A-59.694
N16115 X2.6856 A-60.889
N16120 X2.7005 A-61.297 F23.063
N16125 X2.7153 A-60.912
N16130 X2.7212 A-60.555 F27.629
N16135 X2.7298 A-59.971
N16140 X2.7587 A-57.93
N16145 X2.7646 A-57.498
N16150 X2.7731 A-56.831
N16155 X2.7827 A-55.969
N16160 X2.8165 A-52.826
N16165 X2.8302 A-51.382
N16170 X2.8454 A-49.51
N16175 X2.8537 A-48.325
N16180 X2.8637 A-46.796
N16185 X2.8743 A-44.908
N16190 X2.8804 A-43.739
N16195 X2.8888 A-41.893
N16200 X2.894 A-40.681
N16205 X2.9095 A-36.095
N16210 X2.9137 A-34.566
N16215 X2.9207 A-31.508
N16220 X2.9241 A-29.979
N16225 X2.9294 A-26.922
N16230 X2.9322 A-25.105
N16235 X2.9354 A-22.335
N16240 X2.9372 A-20.807
N16245 X2.9389 A-19.278
N16250 X2.9427 A-14.691
N16255 X2.9454 A-10.105
N16260 X2.9461 A-8.576
N16265 X2.9465 A-7.456
N16270 X2.9428 A-5.886 F23.063
N16275 X2.9325 A-4.691
N16280 X2.9141 Z0.5512 A-3.402
N16285 X2.9065 Z0.5732 A-2.869 F21.805
N16290 Z0.7254 F400.
N16295 X0.4684 A-7.187 F344.64
N16300 Z0.6045 F400.
N16305 Z0.5732 F20.
N16310 X0.4638 Z0.5512 A-8.018 F21.805
N16315 X0.4525 Z0.542 A-10.026 F22.68
N16320 X0.4438 A-13.163
N16325 A-43.739 F27.629
N16330 X0.4451 A-46.538
N16335 X0.4481 A-48.984
N16340 X0.4543 A-52.036
N16345 X0.4634 A-55.247
N16350 X0.4781 A-59.23
N16355 X0.4971 A-63.381
N16360 X0.5241 A-68.23
N16365 X0.5599 A-73.608
N16370 X0.6005 A-78.79
N16375 X0.6446 A-83.653
N16380 X0.6915 A-88.208
N16385 X0.7409 A-92.459
N16390 X0.7926 A-96.392
N16395 X0.8464 A-100.001
N16400 X0.9021 A-103.275
N16405 X0.9594 A-106.205
N16410 X1.0183 A-108.786
N16415 X1.0784 A-111.011
N16420 X1.1021 A-111.735
N16425 X1.1154 A-112.003
N16430 X1.1289 A-112.007
N16435 X1.1421 A-111.749
N16440 X1.1975 A-110.107
N16445 X1.2553 A-108.421
N16450 X1.3276 A-106.349
N16455 X1.4143 A-103.904
N16460 X1.4169 A-103.832
N16465 X1.4301 A-103. F23.063
N16470 X1.4379 A-101.609
N16475 X1.4369 A-99.444 F27.629
N16480 X1.4235 A-97.806
N16485 X1.3652 A-94.255
N16490 X1.3069 A-90.704
N16495 X1.2486 A-87.153
N16500 X1.1903 A-83.602
N16505 X1.132 A-80.051
N16510 X1.0737 A-76.501
N16515 X1.0154 A-72.95
N16520 X0.9571 A-69.399
N16525 X0.8987 A-65.848
N16530 X0.8404 A-62.297
N16535 X0.7821 A-58.746
N16540 X0.7238 A-55.195
N16545 X0.6655 A-51.644
N16550 X0.6072 A-48.093
N16555 X0.5489 A-44.542
N16560 X0.4906 A-40.991
N16565 X0.4746 A-40.551
N16570 X0.4587 A-41.031
N16575 X0.448 A-42.185 F23.063
N16580 X0.4438 A-43.739
N16585 A-65.142 F27.629
N16590 X0.4446 A-66.845
N16595 X0.4469 A-68.757
N16600 X0.4515 A-70.996
N16605 X0.4591 A-73.693
N16610 X0.4693 A-76.45
N16615 X0.485 A-79.878
N16620 X0.5047 A-83.418
N16625 X0.5326 A-87.61
N16630 X0.5694 A-92.302
N16635 X0.6139 A-97.122
N16640 X0.6617 A-101.569
N16645 X0.7123 A-105.669
N16650 X0.7651 A-109.432
N16655 X0.8199 A-112.869
N16660 X0.8763 A-115.985
N16665 X0.9023 A-117.235
N16670 X0.9147 A-117.696
N16675 X0.9277 A-117.914
N16680 X0.9409 A-117.879
N16685 X0.9538 A-117.594
N16690 X0.9807 A-116.727
N16695 X1.0385 A-114.905
N16700 X1.0819 A-113.567
N16705 X1.1421 A-111.749
N16710 X1.1551 A-110.893 F23.063
N16715 X1.1627 A-109.488
N16720 X1.1617 A-107.405 F27.629
N16725 X1.1491 A-105.799
N16730 X1.0669 A-100.381
N16735 X0.9847 A-94.963
N16740 X0.9025 A-89.545
N16745 X0.8203 A-84.126
N16750 X0.7381 A-78.708
N16755 X0.6559 A-73.29
N16760 X0.5737 A-67.872
N16765 X0.4915 A-62.454
N16770 X0.4752 A-61.954
N16775 X0.4587 A-62.434
N16780 X0.448 A-63.588 F23.063
N16785 X0.4438 A-65.142
N16790 A-82.799 F27.629
N16795 X0.4445 A-84.383
N16800 X0.4468 A-86.235
N16805 X0.4508 A-88.179
N16810 X0.457 A-90.376
N16815 X0.4668 A-93.035
N16820 X0.479 A-95.69
N16825 X0.4972 A-98.948
N16830 X0.5193 A-102.272
N16835 X0.5501 A-106.179
N16840 X0.5898 A-110.475
N16845 X0.6378 A-114.898
N16850 X0.689 A-118.911
N16855 X0.735 A-122.047
N16860 X0.7466 A-122.684
N16865 X0.759 A-123.096
N16870 X0.7718 A-123.268
N16875 X0.7848 A-123.196
N16880 X0.7975 A-122.881
N16885 X0.8361 A-121.524
N16890 X0.894 A-119.558
N16895 X0.9373 A-118.127
N16900 X0.9538 A-117.594
N16905 X0.9666 A-116.71 F23.063
N16910 X0.9739 A-115.288
N16915 X0.9727 A-113.255 F27.629
N16920 X0.9604 A-111.684
N16925 X0.9019 A-107.74
N16930 X0.8433 A-103.795
N16935 X0.7847 A-99.851
N16940 X0.7261 A-95.906
N16945 X0.6675 A-91.962
N16950 X0.6089 A-88.017
N16955 X0.5504 A-84.073
N16960 X0.4918 A-80.128
N16965 X0.4753 A-79.611
N16970 X0.4587 A-80.092
N16975 X0.448 A-81.246 F23.063
N16980 X0.4438 A-82.799
N16985 A-98.775 F27.629
N16990 X0.4447 A-100.714
N16995 X0.4466 A-102.286
N17000 X0.4503 A-104.111
N17005 X0.4565 A-106.271
N17010 X0.4645 A-108.427
N17015 X0.4764 A-111.011
N17020 X0.492 A-113.805
N17025 X0.5124 A-116.877
N17030 X0.5387 A-120.219
N17035 X0.5719 A-123.805
N17040 X0.5992 A-126.31
N17045 X0.6025 A-126.573
N17050 X0.6149 A-127.353
N17055 X0.6286 A-127.859
N17060 X0.6429 A-128.072
N17065 X0.6573 A-127.983
N17070 X0.6712 A-127.596
N17075 X0.6916 A-126.796
N17080 X0.735 A-125.155
N17085 X0.7494 A-124.615
N17090 X0.7928 A-123.046
N17095 X0.7975 A-122.881
N17100 X0.8101 A-121.964 F23.063
N17105 X0.8171 A-120.524
N17110 X0.8155 A-118.528 F27.629
N17115 X0.8033 A-116.994
N17120 X0.7254 A-111.771
N17125 X0.6475 A-106.547
N17130 X0.5696 A-101.324
N17135 X0.4917 A-96.101
N17140 X0.4753 A-95.587
N17145 X0.4587 A-96.068
N17150 X0.448 A-97.221 F23.063
N17155 X0.4438 A-98.775
N17160 A-114.063 F27.629
N17165 X0.4447 A-116.
N17170 X0.4466 A-117.572
N17175 X0.4503 A-119.376
N17180 X0.4555 A-121.191
N17185 X0.4633 A-123.292
N17190 X0.4721 A-125.201
N17195 X0.4822 A-127.004
N17200 X0.4924 A-128.519
N17205 X0.4972 A-129.129
N17210 X0.5065 A-130.112
N17215 X0.5173 A-130.903
N17220 X0.5293 A-131.474
N17225 X0.5421 A-131.809
N17230 X0.5552 A-131.895
N17235 X0.5683 A-131.73
N17240 X0.5809 A-131.319
N17245 X0.5929 A-130.312 F23.063
N17250 X0.5989 A-128.824
N17255 X0.5937 A-126.423 F27.629
N17260 X0.5704 A-122.89
N17265 X0.5471 A-119.357
N17270 X0.5239 A-115.824
N17275 X0.5006 A-112.292
N17280 X0.4814 A-110.946
N17285 X0.4587 A-111.356
N17290 X0.448 A-112.509 F23.063
N17295 X0.4438 A-114.063
N17300 A-127.822 F27.629
N17305 X0.4445 A-129.406
N17310 X0.4491 A-130.704
N17315 X0.4562 A-131.867
N17320 X0.4655 A-132.842
N17325 X0.4766 A-133.582
N17330 X0.4889 A-134.054
N17335 X0.5019 A-134.235
N17340 X0.5149 A-134.117
N17345 X0.5275 A-133.705
N17350 X0.5392 A-132.673 F23.063
N17355 X0.545 A-131.173
N17360 X0.5425 A-129.376 F27.629
N17365 X0.5315 A-127.986
N17370 X0.4925 A-125.2
N17375 X0.4757 A-124.635
N17380 X0.4587 A-125.115
N17385 X0.448 A-126.269 F23.063
N17390 X0.4438 A-127.822
N17395 A-132.409 F27.629
N17400 X0.4442 A-133.034
N17405 X0.4449 A-133.346
N17410 X0.4458 A-133.658
N17415 X0.447 A-133.938
N17420 X0.449 A-134.309
N17425 X0.4518 A-134.68
N17430 X0.4539 A-134.92
N17435 X0.456 A-135.119
N17440 X0.4603 A-135.423
N17445 X0.4611 A-135.466
N17450 X0.4645 A-135.629
N17455 X0.4679 A-135.743
N17460 X0.4713 A-135.813
N17465 X0.4748 A-135.842
N17470 X0.4784 A-135.83
N17475 X0.482 A-135.773
N17480 X0.4856 A-135.669
N17485 X0.4902 A-135.466
N17490 X0.5037 A-134.809
N17495 X0.5326 A-133.47
N17500 X0.5558 A-132.409
N17505 X0.6049 A-130.285
N17510 X0.6338 A-129.087
N17515 X0.6482 A-128.5
N17520 X0.6712 A-127.596
N17525 X0.6835 A-126.632 F23.063
N17530 X0.69 A-125.167
N17535 X0.6942 Z0.5512 A-122.873
N17540 X0.6959 Z0.5732 A-121.923 F21.805
N17545 Z0.825 F400.
N17550 G53 G0 Z0.

(2D Contour4)
N17555 M11
N17560 G0 A-169.305
N17565 G187 P3
N17570 G0 X0.0389 Y0.
N17575 G43 Z1.225 H1
N17580 G1 A-169.305 F204.082
N17585 Z0.825 F400.
N17590 Z0.6644 F20.
N17595 Z0.5732
N17600 X0.0394 Z0.5678 A-169.319 F21.805
N17605 X0.0407 Z0.5626 A-169.361
N17610 X0.0429 Z0.5576 A-169.43
N17615 X0.0459 Z0.5532 A-169.524 F22.416
N17620 X0.0496 Z0.5493 A-169.64
N17625 X0.0539 Z0.5462 A-169.774
N17630 X0.0586 Z0.5439 A-169.923
N17635 X0.0637 Z0.5425 A-170.081 F22.983
N17640 X0.0689 Z0.542 A-170.244
N17645 X0.0989 A-171.183
N17650 X0.1042 A-171.298
N17655 X0.1096 A-171.313
N17660 X0.115 A-171.228
N17665 X0.1202 A-171.046
N17670 X0.125 A-170.771
N17675 X0.1292 A-170.413
N17680 X0.1329 A-169.982
N17685 X0.1357 A-169.491
N17690 X0.1377 A-168.955
N17695 X0.1413 A-167.654 F27.629
N17700 X0.1438 A-166.844
N17705 X0.1467 A-166.05
N17710 X0.1517 A-164.78
N17715 X0.1545 A-164.107
N17720 X0.1575 A-163.447
N17725 X0.1636 A-162.215
N17730 X0.1695 A-161.116
N17735 X0.1766 A-159.926
N17740 X0.1823 A-159.021
N17745 X0.19 A-157.879
N17750 X0.1955 A-157.13
N17755 X0.2038 A-156.042
N17760 X0.2088 A-155.415
N17765 X0.2175 A-154.385
N17770 X0.2224 A-153.836
N17775 X0.2314 A-152.863
N17780 X0.2361 A-152.377
N17785 X0.2454 A-151.453
N17790 X0.2499 A-151.031
N17795 X0.2595 A-150.148
N17800 X0.2653 A-149.643
N17805 X0.2853 A-147.973
N17810 X0.2913 A-147.496
N17815 X0.3124 A-145.909
N17820 X0.3173 A-145.559
N17825 X0.3393 A-144.031
N17830 X0.3436 A-143.738
N17835 X0.3664 A-142.267
N17840 X0.3703 A-142.022
N17845 X0.3938 A-140.605
N17850 X0.3973 A-140.398
N17855 X0.4213 A-139.035
N17860 X0.4245 A-138.861
N17865 X0.4488 A-137.551
N17870 X0.4517 A-137.401
N17875 X0.4763 A-136.143
N17880 X0.4789 A-136.018
N17885 X0.5036 A-134.811
N17890 X0.5058 A-134.707
N17895 X0.5304 A-133.552
N17900 X0.5323 A-133.467
N17905 X0.5567 A-132.365
N17910 X0.5583 A-132.293
N17915 X0.5823 A-131.242
N17920 X0.5838 A-131.177
N17925 X0.6076 A-130.166
N17930 X0.609 A-130.107
N17935 X0.6327 A-129.125
N17940 X0.634 A-129.073
N17945 X0.6579 A-128.109
N17950 X0.6591 A-128.062
N17955 X0.6832 A-127.113
N17960 X0.6843 A-127.07
N17965 X0.7087 A-126.133
N17970 X0.7097 A-126.094
N17975 X0.7344 A-125.169
N17980 X0.7353 A-125.134
N17985 X0.7602 A-124.219
N17990 X0.7611 A-124.186
N17995 X0.7861 A-123.28
N18000 X0.787 A-123.251
N18005 X0.8123 A-122.353
N18010 X0.8131 A-122.326
N18015 X0.8387 A-121.435
N18020 X0.8394 A-121.41
N18025 X0.8652 A-120.526
N18030 X0.8659 A-120.503
N18035 X0.8918 A-119.628
N18040 X0.8925 A-119.606
N18045 X0.9186 A-118.739
N18050 X0.9192 A-118.718
N18055 X0.9455 A-117.859
N18060 X0.946 A-117.841
N18065 X0.9724 A-116.991
N18070 X0.9729 A-116.973
N18075 X0.9993 A-116.133
N18080 X0.9998 A-116.116
N18085 X1.0263 A-115.285
N18090 X1.0267 A-115.27
N18095 X1.0532 A-114.447
N18100 X1.0537 A-114.433
N18105 X1.0801 A-113.62
N18110 X1.0806 A-113.607
N18115 X1.107 A-112.802
N18120 X1.1074 A-112.79
N18125 X1.1339 A-111.994
N18130 X1.1342 A-111.983
N18135 X1.1606 A-111.195
N18140 X1.1609 A-111.185
N18145 X1.1873 A-110.406
N18150 X1.1876 A-110.396
N18155 X1.2139 A-109.625
N18160 X1.2142 A-109.617

N20440 X2.3072 A-274.298
N20445 X2.2524 A-272.531
N20450 X2.1966 A-270.792
N20455 X2.14 A-269.078
N20460 X2.0828 A-267.387
N20465 X2.0253 A-265.719
N20470 X1.9674 A-264.071
N20475 X1.9094 A-262.442
N20480 X1.8514 A-260.83
N20485 X1.7936 A-259.233
N20490 X1.7361 A-257.653
N20495 X1.6791 A-256.088
N20500 X1.6226 A-254.541
N20505 A-254.54 F23.96
N20510 X1.5669 A-253.012 F27.629
N20515 X1.5668 A-253.008
N20520 X1.512 A-251.5
N20525 X1.5118 A-251.494
N20530 X1.4578 A-250.
N20535 X1.4575 A-249.992
N20540 X1.4034 A-248.481
N20545 X1.403 A-248.471
N20550 X1.3477 A-246.914
N20555 X1.3473 A-246.902
N20560 X1.2909 A-245.295
N20565 X1.2904 A-245.28
N20570 X1.2331 A-243.628
N20575 X1.2325 A-243.611
N20580 X1.1748 A-241.917
N20585 X1.174 A-241.895
N20590 X1.1161 A-240.163
N20595 X1.1152 A-240.137
N20600 X1.0571 A-238.364
N20605 X1.0562 A-238.334
N20610 X0.9981 A-236.519
N20615 X0.997 A-236.484
N20620 X0.9392 A-234.627
N20625 X0.9379 A-234.586
N20630 X0.8806 A-232.688
N20635 X0.8791 A-232.638
N20640 X0.8226 A-230.699
N20645 X0.8209 A-230.64
N20650 X0.7653 A-228.659
N20655 X0.7633 A-228.588
N20660 X0.7089 A-226.563
N20665 X0.7067 A-226.478
N20670 X0.6536 A-224.408
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%

Em.Re said:

Try dropping the feed rate. I've been making similar toolpaths in fusion lately, but in stainless. I loaded up an aluminum blank and cranked the feed rate and had similar jerkiness. I couldn't figure it out because my dry run was smooth. So I started bumping the feed rate down and at a certain threshold the pausing stopped.
This was with a 2002 VF3 hrt160 , HSM option , inverse time and smoothing applied.
Not sure what is exactly happening, if I'm hitting the limits of the equipment or the control or the software but going slower sorted it out. And it didn't get gradually better , it just hit a cutoff point where above that it would pause and below it would run continuous .

Click to expand...

Thanks, you bring up a good point. My rotary can only move so fast (relatively slow) and I had my feed rate at 21 ipm. I know I can go way faster with carbide and aluminum, but I ran it the way I did because the part was cantilevered out a bit. Even at 21 ipm, I bet that might have been asking the rotary to rotate faster than it can. I'll drop the feed rate and see what happens.

Bobw said:

This is mostly just thoughts and a few questions..

And I'd like to see a sample of the code also...

Thought.. A spiral pocket doesn't seem like a code friendly idea when
you have the A axis involved. (I'm assuming part is oriented along the
X)

As your tool is attemting to make a spiral on the cylinder, your X has
to constantly change feed rates to kind of falsify the Y (if that makes sense).

I'm guessing that you are seeing a lot of feed rate changes in your segments..

Who ever said it up there, if you can code it as a wrap, you would eliminate all
that, and it might get rid of your jerkiness..


Another thought. On an old Fadal, it can do a simultaneous 4 axis move,
I'm pretty sure it will even do one with an arc. I know it will do a
YZJKA move, but it will NOT do it fast. About 7ipm if I remember right.

So if you can code so that you are only doing 2 axis moves, that might help,
back and forth instead of a spiral pocket, or at least linear 3 axis moves,
no spirals..

Just tossing some thoughts out.

Click to expand...

I posted a bunch of code above this post if you'd like to check it out. In Fusion, it does give me the "wrap toolpath" option, so I am only moving 2 axes (x and a). I'm really not sure how to do it using the g107. I'd have to see an example in order to understand that one. But either way, it seems like I'd end up with code moving 2 axes...

Another guy on here mentioned dropping the feed rate. I'm definitely going to give that a try.

Delw said:

Draw your part flat ie with x and y, draw a finish pass then offset the finish pass every .010 or less step over, then trim those pass's so you dont cut air.
Then use the g code I mentioned above switch y to A (cylinder mapping g107)
this will change you y axis to a axis movement.
now if you cant draw a arc in your software with out segments than you will have segments if you get g3 or g2s and g01s you will be fine.

Click to expand...

Would you happen to have some code generated from this that I could check out? That would help me understand it better. I can wrap toolpath in Fusion 360, so I'm wondering if that's the same thing (although there's no g107) output, just a lot of x and a moves.

controlled_burn said:

Would you happen to have some code generated from this that I could check out? That would help me understand it better. I can wrap toolpath in Fusion 360, so I'm wondering if that's the same thing (although there's no g107) output, just a lot of x and a moves.

Click to expand...

He's talking about letting the machine wrap the profile around the part, not letting the cam program do it.

Basically program as if in XY, yet you use some code, with a factor for the diameter, and the machine
substitutes the A axis motion for Y. You may also need to mirror it, but there should be a code for
that also.. Get rid of all that tiny line segment crap.

You can see an example for a Fadal. Section 12 of the user manual. Just google Fadal Tech Docs.
On a Fadal its G17 Qword.

That should allow the machine to treat your paths as if they are nothing more than a regular
old G2 or G3.

Ive found on my Fadals that having a feedrate on any line involving the rotary axis will cause the machine to limp into DPM mode, for whatever reason.
Try changing your fast (rapid) feedrate to the same as your desired feedrate.
Then delete any F values (get rid of f entirely) except your first feed move (before it makes an A move).

Im willing to bet this cleans it up.
I have no problems feeding at up to 60ipm on my old falads on the rotary.

macds said:

Ive found on my Fadals that having a feedrate on any line involving the rotary axis will cause the machine to limp into DPM mode, for whatever reason.
Try changing your fast (rapid) feedrate to the same as your desired feedrate.
Then delete any F values (get rid of f entirely) except your first feed move (before it makes an A move).

Im willing to bet this cleans it up.
I have no problems feeding at up to 60ipm on my old falads on the rotary.

Click to expand...

Interesting... I'll definitely give this a shot and see what happens.

In the parameters there is one for A axis diameter, it controls/alters the feed rate for the rotory based on what dia you have in it.I'd try changing that as well , it kind of acts like the override only just for the a axis.