Haas 4th axis with slightly jerky rotation during program using simultaneous a and x
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  1. #1
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    Default 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.



    img_1614.jpg

    Thanks in advance for any help/advice!

  2. #2
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    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.

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    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.

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    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.

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    Quote Originally Posted by Delw View Post
    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.

    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.

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    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.

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    Quote Originally Posted by G00 Proto View Post
    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.
    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.

    img_1639.jpg
    img_1634.jpg
    img_1639.jpg

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    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 .

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    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.

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    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.

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    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.

  16. #12
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    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.

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    Quote Originally Posted by macds View Post
    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.
    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.
    N85 Z0.725
    N90 X1.5163 Z0.7231 A16.064 F17.241
    N95 X1.4687 Z0.7212 A18.666
    N100 X1.4154 Z0.7194 A19.31
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    N7950 X1.0819 A-113.567
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    N7960 X1.1551 A-110.893 F22.124
    N7965 X1.1627 A-109.488
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    N8105 X0.735 A-122.047

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    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
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    N15820 X2.9322 A32.354
    N15825 X2.9293 A34.23
    N15830 X2.924 A37.288
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    N15920 X2.7213 A67.864
    N15925 X2.6999 A69.153
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    N15935 X2.6702 A69.119
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    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
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    N16015 X2.6608 A11.839
    N16020 X2.6613 A7.957
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    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
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    N16095 X2.6685 A-50.273
    N16100 X2.669 A-54.154
    N16105 X2.6694 A-58.036
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    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
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    N16350 X0.4781 A-59.23
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    N16365 X0.5599 A-73.608
    N16370 X0.6005 A-78.79
    N16375 X0.6446 A-83.653
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    N16385 X0.7409 A-92.459
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    N16395 X0.8464 A-100.001
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    N16415 X1.0784 A-111.011
    N16420 X1.1021 A-111.735
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    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
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    N16540 X0.7238 A-55.195
    N16545 X0.6655 A-51.644
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    N16575 X0.448 A-42.185 F23.063
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    N16650 X0.7651 A-109.432
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    N16665 X0.9023 A-117.235
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    N16680 X0.9409 A-117.879
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    N16690 X0.9807 A-116.727
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    N16700 X1.0819 A-113.567
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    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
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    N16755 X0.6559 A-73.29
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    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
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    N16825 X0.4972 A-98.948
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    N16840 X0.5898 A-110.475
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    N16850 X0.689 A-118.911
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    N16880 X0.7975 A-122.881
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    N16950 X0.6089 A-88.017
    N16955 X0.5504 A-84.073
    N16960 X0.4918 A-80.128
    N16965 X0.4753 A-79.611
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    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
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    N17015 X0.4764 A-111.011
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    N17025 X0.5124 A-116.877
    N17030 X0.5387 A-120.219
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    N17040 X0.5992 A-126.31
    N17045 X0.6025 A-126.573
    N17050 X0.6149 A-127.353
    N17055 X0.6286 A-127.859
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    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
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    %

  18. #14
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    Quote Originally Posted by Em.Re View Post
    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 .
    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.

  19. #15
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    Quote Originally Posted by Bobw View Post
    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 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.

  20. #16
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    Quote Originally Posted by Delw View Post
    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.
    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.

  21. #17
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    Quote Originally Posted by controlled_burn View Post
    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.
    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.

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    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.

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    Quote Originally Posted by macds View Post
    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.
    Interesting... I'll definitely give this a shot and see what happens.

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    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.


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