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  1. #1
    Join Date
    Dec 2019
    Posts
    18

    Cutter drives deep into part

    Using TNG.
    I set the xyz axis to zero.
    When I start the run, the cutter dives deeply into the part and moves to the helix location, moves back up and starts it's correct movement. Needless to say, the part has been ruined.
    What step am I doing wrong?
    I don't have limit/homing switches so I haven't set up a home position.
    It should be noted that I never had this problem when running CNCUSB V1.
    Thanks,
    Steve

    Sent from my SM-G975U using Tapatalk

  2. #2
    Join Date
    Jan 2005
    Posts
    15362

    Re: Cutter drives deep into part

    Quote Originally Posted by schesby View Post
    Using TNG.
    I set the xyz axis to zero.
    When I start the run, the cutter dives deeply into the part and moves to the helix location, moves back up and starts it's correct movement. Needless to say, the part has been ruined.
    What step am I doing wrong?
    I don't have limit/homing switches so I haven't set up a home position.
    It should be noted that I never had this problem when running CNCUSB V1.
    Thanks,
    Steve

    Sent from my SM-G975U using Tapatalk
    Paste the start of your program here, it may be how it is programed, Z axes would not be set to zero, you have to set your tool to the top of your part and the same in your cam program
    Mactec54

  3. #3
    Join Date
    Dec 2019
    Posts
    18

    Re: Cutter drives deep into part

    I do set the top of the workpiece as z-zero.
    Here's the first bit of gcode. Not sure where the helix down starts. Gcode is still confusing to me!
    %
    (1001)
    (T3 D=0.5 CR=0.25 - ZMIN=-0.534 - ball end mill)
    N10 G90
    N15 G20
    N20 G28 G91 Z0
    N25 G90
    *
    (Adaptive1)
    N30 T3
    N35 S5000 M3
    N40 G0 X1.0011 Y-2.4943
    N45 Z0.6
    N50 Z0.2
    N55 Z0.1
    N60 G1 X0.9958 Y-2.4977 Z0.0998 F15
    N65 X0.9909 Y-2.5015 Z0.0996
    N70 X0.9864 Y-2.5059 Z0.0993
    N75 X0.9823 Y-2.5107 Z0.0991
    N80 X0.9788 Y-2.5159 Z0.0989
    N85 X0.9758 Y-2.5214 Z0.0987
    N90 X0.9733 Y-2.5271 Z0.0985
    N95 X0.9715 Y-2.5331 Z0.0982
    N100 X0.9703 Y-2.5393 Z0.098
    N105 X0.9696 Y-2.5455 Z0.0978
    N110 Y-2.5518 Z0.0976
    N115 X0.9703 Y-2.558 Z0.0974
    N120 X0.9715 Y-2.5641 Z0.0972
    N125 X0.9734 Y-2.5701 Z0.0969
    N130 X0.9758 Y-2.5759 Z0.0967
    N135 X0.9789 Y-2.5814 Z0.0965
    N140 X0.9824 Y-2.5865 Z0.0963
    N145 X0.9865 Y-2.5913 Z0.0961
    N150 X0.991 Y-2.5957 Z0.0958
    N155 X0.9959 Y-2.5995 Z0.0956
    N160 X1.0012 Y-2.6029 Z0.0954
    N165 X1.0068 Y-2.6057 Z0.0952
    N170 X1.0126 Y-2.608 Z0.095
    N175 X1.0187 Y-2.6096 Z0.0947
    N180 X1.0248 Y-2.6107 Z0.0945
    N185 X1.0311 Y-2.6111 Z0.0943
    N190 X1.0373 Y-2.6108 Z0.0941
    N195 X1.0436 Y-2.61 Z0.0939
    N200 X1.0496 Y-2.6085 Z0.0937
    N205 X1.0556 Y-2.6065 Z0.0934
    N210 X1.0612 Y-2.6038 Z0.0932
    N215 X1.0666 Y-2.6006 Z0.093
    N220 X1.0717 Y-2.5969 Z0.0928
    N225 X1.0763 Y-2.5927 Z0.0926
    N230 X1.0805 Y-2.5881 Z0.0923
    N235 X1.0842 Y-2.583 Z0.0921
    N240 X1.0874 Y-2.5776 Z0.0919
    N245 X1.09 Y-2.5719 Z0.0917
    N250 X1.0921 Y-2.566 Z0.0915
    N255 X1.0935 Y-2.5599 Z0.0912
    N260 X1.0943 Y-2.5537 Z0.091
    N265 X1.0945 Y-2.5474 Z0.0908
    N270 X1.0941 Y-2.5412 Z0.0906
    N275 X1.0931 Y-2.535 Z0.0904
    N280 X1.0914 Y-2.529 Z0.0902
    N285 X1.0891 Y-2.5231 Z0.0899
    N290 X1.0863 Y-2.5175 Z0.0897
    N295 X1.0829 Y-2.5123 Z0.0895
    N300 X1.079 Y-2.5073 Z0.0893
    N305 X1.0747 Y-2.5029 Z0.0891
    N310 X1.0699 Y-2.4988 Z0.0888
    N315 X1.0647 Y-2.4953 Z0.0886
    N320 X1.0592 Y-2.4923 Z0.0884
    N325 X1.0534 Y-2.4898 Z0.0882
    N330 X1.0474 Y-2.488 Z0.088
    N335 X1.0413 Y-2.4868 Z0.0877
    N340 X1.0351 Y-2.4861 Z0.0875
    N345 X1.0288 Y-2.4862 Z0.0873
    N350 X1.0226 Y-2.4868 Z0.0871
    N355 X1.0164 Y-2.4881 Z0.0869
    N360 X1.0105 Y-2.4899 Z0.0866
    N365 X1.0047 Y-2.4924 Z0.0864
    N370 X0.9992 Y-2.4954 Z0.0862
    N375 X0.994 Y-2.499 Z0.086
    N380 X0.9893 Y-2.503 Z0.0858
    N385 X0.9849 Y-2.5075 Z0.0856
    N390 X0.9811 Y-2.5124 Z0.0853
    N395 X0.9777 Y-2.5177 Z0.0851
    N400 X0.9749 Y-2.5233 Z0.0849
    N405 X0.9726 Y-2.5292 Z0.0847
    N410 X0.971 Y-2.5352 Z0.0845
    N415 X0.97 Y-2.5414 Z0.0842
    N420 X0.9696 Y-2.5477 Z0.084
    N425 X0.9698 Y-2.5539 Z0.0838
    N430 X0.9706 Y-2.5601 Z0.0836
    N435 X0.9721 Y-2.5662 Z0.0834
    N440 X0.9742 Y-2.5721 Z0.0831
    N445 X0.9768 Y-2.5778 Z0.0829
    N450 X0.98 Y-2.5832 Z0.0827
    N455 X0.9838 Y-2.5882 Z0.0825
    N460 X0.988 Y-2.5929 Z0.0823
    N465 X0.9926 Y-2.5971 Z0.0821
    N470 X0.9977 Y-2.6008 Z0.0818
    N475 X1.0031 Y-2.6039 Z0.0816
    N480 X1.0088 Y-2.6066 Z0.0814
    N485 X1.0147 Y-2.6086 Z0.0812
    N490 X1.0208 Y-2.61 Z0.081
    N495 X1.027 Y-2.6109 Z0.0807
    N500 X1.0333 Y-2.6111 Z0.0805
    N505 X1.0395 Y-2.6106 Z0.0803
    N510 X1.0457 Y-2.6096 Z0.0801
    N515 X1.0517 Y-2.6079 Z0.0799
    N520 X1.0576 Y-2.6056 Z0.0796
    N525 X1.0631 Y-2.6028 Z0.0794
    N530 X1.0684 Y-2.5994 Z0.0792
    N535 X1.0733 Y-2.5955 Z0.079
    N540 X1.0778 Y-2.5911 Z0.0788
    N545 X1.0818 Y-2.5863 Z0.0785
    N550 X1.0854 Y-2.5812 Z0.0783
    N555 X1.0884 Y-2.5757 Z0.0781
    N560 X1.0908 Y-2.5699 Z0.0779
    N565 X1.0926 Y-2.5639 Z0.0777
    N570 X1.0939 Y-2.5578 Z0.0775
    N575 X1.0945 Y-2.5515 Z0.0772
    N580 Y-2.5453 Z0.077
    N585 X1.0938 Y-2.539 Z0.0768
    N590 X1.0926 Y-2.5329 Z0.0766
    N595 X1.0907 Y-2.5269 Z0.0764
    N600 X1.0882 Y-2.5212 Z0.0761
    N605 X1.0852 Y-2.5157 Z0.0759
    N610 X1.0816 Y-2.5105 Z0.0757
    N615 X1.0776 Y-2.5057 Z0.0755
    N620 X1.0731 Y-2.5014 Z0.0753
    N625 X1.0681 Y-2.4975 Z0.075
    N630 X1.0628 Y-2.4942 Z0.0748
    N635 X1.0572 Y-2.4914 Z0.0746
    N640 X1.0514 Y-2.4891 Z0.0744
    N645 X1.0453 Y-2.4875 Z0.0742
    N650 X1.0391 Y-2.4865 Z0.074
    N655 X1.0329 Y-2.4861 Z0.0737
    N660 X1.0266 Y-2.4863 Z0.0735
    N665 X1.0204 Y-2.4872 Z0.0733
    N670 X1.0143 Y-2.4886 Z0.0731
    N675 X1.0084 Y-2.4907 Z0.0729
    N680 X1.0028 Y-2.4934 Z0.0726
    N685 X0.9974 Y-2.4966 Z0.0724
    N690 X0.9923 Y-2.5003 Z0.0722
    N695 X0.9877 Y-2.5045 Z0.072
    N700 X0.9835 Y-2.5092 Z0.0718
    N705 X0.9798 Y-2.5142 Z0.0715
    N710 X0.9767 Y-2.5196 Z0.0713
    N715 X0.974 Y-2.5253 Z0.0711
    N720 X0.972 Y-2.5313 Z0.0709
    N725 X0.9706 Y-2.5374 Z0.0707
    N730 X0.9698 Y-2.5436 Z0.0705
    N735 X0.9696 Y-2.5498 Z0.0702
    N740 X0.97 Y-2.5561 Z0.07
    N745 X0.9711 Y-2.5623 Z0.0698
    N750 X0.9728 Y-2.5683 Z0.0696
    N755 X0.975 Y-2.5741 Z0.0694
    N760 X0.9779 Y-2.5797 Z0.0691
    N765 X0.9813 Y-2.585 Z0.0689
    N770 X0.9852 Y-2.5899 Z0.0687
    N775 X0.9895 Y-2.5944 Z0.0685
    N780 X0.9943 Y-2.5984 Z0.0683
    N785 X0.9995 Y-2.6019 Z0.068
    N790 X1.005 Y-2.6049 Z0.0678
    N795 X1.0108 Y-2.6073 Z0.0676
    N800 X1.0168 Y-2.6092 Z0.0674
    N805 X1.0229 Y-2.6104 Z0.0672
    N810 X1.0292 Y-2.611 Z0.0669
    N815 X1.0354 Z0.0667
    N820 X1.0417 Y-2.6103 Z0.0665
    N825 X1.0478 Y-2.6091 Z0.0663
    N830 X1.0538 Y-2.6072 Z0.0661
    N835 X1.0595 Y-2.6047 Z0.0659
    N840 X1.065 Y-2.6017 Z0.0656
    N845 X1.0702 Y-2.5981 Z0.0654
    N850 X1.0749 Y-2.594 Z0.0652
    N855 X1.0793 Y-2.5895 Z0.065
    N860 X1.0831 Y-2.5846 Z0.0648
    N865 X1.0865 Y-2.5793 Z0.0645
    N870 X1.0893 Y-2.5737 Z0.0643
    N875 X1.0915 Y-2.5678 Z0.0641
    N880 X1.0931 Y-2.5618 Z0.0639
    N885 X1.0942 Y-2.5556 Z0.0637
    N890 X1.0946 Y-2.5493 Z0.0634
    N895 X1.0943 Y-2.5431 Z0.0632
    N900 X1.0935 Y-2.5369 Z0.063
    N905 X1.092 Y-2.5308 Z0.0628
    N910 X1.0899 Y-2.5249 Z0.0626
    N915 X1.0872 Y-2.5192 Z0.0624
    N920 X1.084 Y-2.5138 Z0.0621
    N925 X1.0803 Y-2.5088 Z0.0619
    N930 X1.0761 Y-2.5042 Z0.0617
    N935 X1.0714 Y-2.5 Z0.0615
    N940 X1.0663 Y-2.4963 Z0.0613
    N945 X1.0609 Y-2.4931 Z0.061
    N950 X1.0552 Y-2.4905 Z0.0608
    N955 X1.0493 Y-2.4885 Z0.0606
    N960 X1.0432 Y-2.4871 Z0.0604
    N965 X1.037 Y-2.4863 Z0.0602
    N970 X1.0307 Y-2.4861 Z0.0599
    N975 X1.0245 Y-2.4865 Z0.0597
    N980 X1.0183 Y-2.4876 Z0.0595
    N985 X1.0123 Y-2.4893 Z0.0593
    N990 X1.0064 Y-2.4916 Z0.0591
    N995 X1.0009 Y-2.4944 Z0.0589
    N1000 X0.9956 Y-2.4978 Z0.0586
    *
    Thanks for your help.
    Steve

    *


    Sent from my SM-G975U using Tapatalk

  4. #4
    Join Date
    Jan 2005
    Posts
    15362

    Re: Cutter drives deep into part

    Quote Originally Posted by schesby View Post
    I do set the top of the workpiece as z-zero.
    Here's the first bit of gcode. Not sure where the helix down starts. Gcode is still confusing to me!
    %
    (1001)
    (T3 D=0.5 CR=0.25 - ZMIN=-0.534 - ball end mill)
    N10 G90
    N15 G20
    N20 G28 G91 Z0
    N25 G90
    *
    (Adaptive1)
    N30 T3
    N35 S5000 M3
    N40 G0 X1.0011 Y-2.4943
    N45 Z0.6
    N50 Z0.2
    N55 Z0.1
    N60 G1 X0.9958 Y-2.4977 Z0.0998 F15
    N65 X0.9909 Y-2.5015 Z0.0996
    N70 X0.9864 Y-2.5059 Z0.0993


    *
    Thanks for your help.
    Steve

    *


    Sent from my SM-G975U using Tapatalk
    Your Z-axis is going the wrong way then, all Z axis move need to be Negative moves when going down, Positive moves is for the Z axis to go up, so in your program they should show as Z-0.0998

    Line 55 Z0.1 = .1 above the Part

    So you have to correct your machine so the Z axis moves in the correct direction, and then your Program needs to be corrected also
    Mactec54

  5. #5
    Join Date
    Aug 2009
    Posts
    1567

    Re: Cutter drives deep into part

    ...looks like z is going minus from Z+.1

  6. #6
    Join Date
    May 2005
    Posts
    1662

    Re: Cutter drives deep into part

    (1001)
    (T3 D=0.5 CR=0.25 - ZMIN=-0.534 - ball end mill)
    N10 G90
    N15 G20
    N20 G28 G91 Z0
    N25 G90
    *
    (Adaptive1)
    N30 T3
    If your control pauses for a button press at the T3 tool change command ignore the rest of my comment.

    Try single blocking the program. G28 can be a problem depending on how the machine has been set-up.
    Anyone who says "It only goes together one way" has no imagination.

  7. #7
    Join Date
    Feb 2011
    Posts
    138

    Re: Cutter drives deep into part

    I have disable the G28 in pp from fusion360 ( looking the first line, name), works ok now

  8. #8
    Join Date
    Mar 2017
    Posts
    1295

    Re: Cutter drives deep into part

    Assuming, that without home position your machine coordinates are not set correctly, G28 G91 Z0 line will move your Z axis to machine zero position which is probably somewhere inside your workpiece.

  9. #9
    Join Date
    Dec 2019
    Posts
    18

    Re: Cutter drives deep into part

    Quote Originally Posted by PlanetCNC View Post
    Assuming, that without home position your machine coordinates are not set correctly, G28 G91 Z0 line will move your Z axis to machine zero position which is probably somewhere inside your workpiece.
    As it urns out, this was the problem. After moving the spindle to a safe height, I reset the machine coordinates. I then ran the program again after setting the work piece height to zero at 1" above the actual workpiece. I then did a dry run (spindle not running) which performed perfectly.
    I'm now about 1/3 way through cutting a 3D topo map which appears to be going well.
    Thanks to everyone for your help. I hope eventually to be able to provide meaningful help to another "newbie". Until then, I will continue to learn!

    Sent from my SM-G975U using Tapatalk

  10. #10
    Join Date
    Jan 2005
    Posts
    15362

    Re: Cutter drives deep into part

    Quote Originally Posted by schesby View Post
    As it urns out, this was the problem. After moving the spindle to a safe height, I reset the machine coordinates. I then ran the program again after setting the work piece height to zero at 1" above the actual workpiece. I then did a dry run (spindle not running) which performed perfectly.
    I'm now about 1/3 way through cutting a 3D topo map which appears to be going well.
    Thanks to everyone for your help. I hope eventually to be able to provide meaningful help to another "newbie". Until then, I will continue to learn!

    Sent from my SM-G975U using Tapatalk
    You still need to correct the Z axis so that it mover the correct way Down is Z- Your program also should have Z- moves from the top down, what you have done is programed to the max depth in the part as zero
    Mactec54

  11. #11
    Join Date
    May 2005
    Posts
    1662

    Re: Cutter drives deep into part

    I'll assume the z axis is moving down when you press the jog down button.
    I then ran the program again after setting the work piece height to zero at 1" above the actual workpiece.
    If the work piece Z zero is 1.0" above the material it should not be cutting on any command where Z is greater than Z -1. Maybe it's just an inefficient program that spends a lot of time cutting air before starting Z minus moves..
    The control probably defaults to G54 but it's not a bad idea to add G54 and G49 to the top of the program.
    I'm curious if running G92.1 in MDI before running this program changes anything, it's unlikely but not impossible that there's something stuck in G92.
    Anyone who says "It only goes together one way" has no imagination.

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