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  1. #1
    Join Date
    May 2008
    Posts
    266

    Lathe Tool Offsets

    I set up some tool offsets in the Z & X axes for my lathe and have noticed that the offset is displayed by shifting the relevent toolpath onscreen.
    Whilst I understand that what is shown is the actual movement of each axis and is correct, I find this gives a confusing representation of the part being machined. Therefore, what I would like to see is an option for these tool offsets to be hidden from view, so the display more closely resembles the shape of the finished part - like a CAM app does.


    Martin.

  2. #2
    Join Date
    Mar 2017
    Posts
    1295

    Re: Lathe Tool Offsets

    3D display is meant to show movement within machine limits. If offset is ignored then this representation is no longer valid. And only simplest g-codes kind of look like finished part, more complex do not, the resulting display would be useless. It will just look nice with some simple g-codes and that is it.

  3. #3
    Join Date
    May 2008
    Posts
    266

    Re: Lathe Tool Offsets

    I couldn't disagree more when you say the idea is useless.

    The problem with having only the current option, is that there is no easy way to reassure the operator that the various toolpaths have the expected relationship with each other. I agree It's important to know the axes are within their limits of travel, but seeing the toolpaths represented from the cutting tool's 'real world' position is just as important to the end user. What I would like (assuming it's not a huge undertaking), is both options, not one or the other, please.

    By the way, under Menu > View > Show you have Hoover - is this supposed to be Hover instead?


    Thanks, Martin.

  4. #4
    Join Date
    Mar 2017
    Posts
    1295

    Re: Lathe Tool Offsets

    Showing tool tip position instead of machine position does make sense. I'll try to implement this option.
    Thanks for tip about Hoover.

  5. #5
    Join Date
    May 2008
    Posts
    266

    Re: Lathe Tool Offsets

    I would appreciate that very much!
    Thank you for listening.

    I'm still very pleased with my PlanetCNC setup - TNG is great software.

    Martin.

  6. #6
    Join Date
    Mar 2017
    Posts
    1295

    Re: Lathe Tool Offsets

    Can you send me lathe g-code where this feature would be beneficial along with your TNGv2 profile?

  7. #7
    Join Date
    May 2008
    Posts
    266

    Re: Lathe Tool Offsets

    Quote Originally Posted by PlanetCNC View Post
    Can you send me lathe g-code where this feature would be beneficial along with your TNGv2 profile?
    Sample gcode below shows where a boring tool that has a large defined offset causes the onscreen toolpaths to appear detached from one another.

    If you set the Parting tool and the Boring tool offsets to zero, you get a much improved visualisation of the part being machined.

    Profile attached.

    Thanks.


    (PLANETCNC-TNG 2)
    (ECAM V4 ***LATHE*** )
    (CREATED ON 23/02/2020 AT 21:05)
    (PART DESCRIPTION: TURN, BORE & PART OFF EXAMPLE)
    (PROG NUMBER: 1)
    (STOCK O/D: 40.000)
    (STOCK I/D: 22.000)
    (STOCK LENGTH: 45.000)

    (------------------ TOOL LIST ------------------)
    (TOOL:EXTERN TURN TOOL [RN 0.2] )
    (TOOL:EXT GROOVE TOOL [L 2MM] [RN 0.1] )
    (TOOL:INTERN TURN TOOL [RN 0.2] )
    (-----------------------------------------------)

    (SETUP 1)

    G08 G18 G21 G54 G61 G80 G90

    (EXTERNAL TURNING - ROUGHING)
    (EXTERN TURN TOOL [RN 0.2])
    (MAX Z TRAVEL: 1.500)
    (MIN Z TRAVEL: -43.700)
    (MAX X TRAVEL: 20.500)
    (MIN X TRAVEL: 18.050)

    G94 T10 G43 H10 M6
    G97 S1275 M3 M9
    G04 P2
    G0 X20.500 Z1.500
    Z0.607
    X19.400
    G1 Z-35.896 F125
    X19.900 Z-35.396
    G0 Z0.607
    X18.800
    G1 Z-19.896
    X19.300 Z-19.396
    G0 Z0.607
    X18.700
    G1 X18.200 F88
    Z-3.896 F125
    X18.700 Z-3.396
    G0 Z0.607
    G1 X18.050 Z0.107 F88
    X19.550 Z-39.896 F125
    Z-43.594
    X19.850 Z-43.700
    G0 X20.500 Z-43.200
    Z1.500
    G53 X25.000 Z120.000
    M5
    M9

    (INTERNAL TURNING - ROUGHING)
    (INTERN TURN TOOL [RN 0.2])
    (MAX Z TRAVEL: 3.500)
    (MIN Z TRAVEL: -40.193)
    (MAX X TRAVEL: 20.500)
    (MIN X TRAVEL: 10.500)

    G94 T25 G43 H25 M6
    G97 S1200 M3 M8
    G04 P2
    G0 X20.500 Z3.500
    X10.500
    Z0.407
    X11.500
    G1 Z-40.093 F110
    X11.000 Z-39.593
    G0 Z0.407
    X12.000
    G1 Z-40.093
    X11.500 Z-39.593
    G0 Z0.407
    X12.500
    G1 Z-40.093
    X12.000 Z-39.593
    G0 Z0.407
    X13.000
    G1 Z-38.674
    X12.500 Z-38.174
    G0 Z0.407
    X13.500
    G1 Z-24.453
    X13.000 Z-23.953
    G0 Z0.407
    X14.000
    G1 Z-10.232
    X13.500 Z-9.732
    G0 Z0.407
    G1 X14.356 Z-0.093 F77
    X13.500 Z-24.453 F110
    X13.000 Z-38.674
    X12.950 Z-40.093
    G0 X10.500 Z-39.593
    Z0.307
    X13.906
    G1 X14.406 Z-0.193
    X13.000 Z-40.193
    G0 X10.500 Z-39.693
    Z3.500
    X20.500
    G53 X25.000 Z120.000
    M5
    M9

    (CUT)
    (EXT GROOVE TOOL [L 2MM] [RN 0.1])
    (MAX Z TRAVEL: 0.500)
    (MIN Z TRAVEL: -42.000)
    (MAX X TRAVEL: 20.500)
    (MIN X TRAVEL: 9.900)

    G94 T12 G43 H12 M6
    G97 S1000 M3 M8
    G04 P2
    G0 X20.500 Z0.500
    Z-42.000
    G1 X9.900 F35
    G0 X20.500
    Z0.500
    G53 X25.000 Z120.000
    M5
    M9
    M2

  8. #8
    Join Date
    May 2008
    Posts
    266

    Re: Lathe Tool Offsets

    Just bumping this topic in case my last post hasn't been noticed.

    The ideal solution for me would be an option under Menu > View > Show/Hide Tool Offsets.

    This video of a Centroid setup shows the parting-off toolpath as I would like to see it in relation to the main toolpath.

    Many thanks.



  9. #9
    Join Date
    Mar 2017
    Posts
    1295

    Re: Lathe Tool Offsets

    This is not forgotten.
    I'm working on some very useful lathe g-code cycles. I also need to make our test lathe operational.
    But it is a lot of work I want to do it right.

  10. #10
    Join Date
    May 2008
    Posts
    266

    Re: Lathe Tool Offsets

    Quote Originally Posted by PlanetCNC View Post
    This is not forgotten.
    I'm working on some very useful lathe g-code cycles. I also need to make our test lathe operational.
    But it is a lot of work I want to do it right.

    I know you've worked hard on TNG v2 and it really does show.
    PlanetCNC is already up with the best controllers available, so it's no problem waiting a little longer for more good stuff.
    I agree - do it right.

    Thanks.

  11. #11
    Join Date
    Mar 2017
    Posts
    1295

    Re: Lathe Tool Offsets

    Latest version has setting to exclude tool offsets from 3d visualization. See setting "User Interface/3D/Properties/Show" and check "Offset".

  12. #12
    Join Date
    May 2008
    Posts
    266

    Re: Lathe Tool Offsets

    Quote Originally Posted by PlanetCNC View Post
    Latest version has setting to exclude tool offsets from 3d visualization. See setting "User Interface/3D/Properties/Show" and check "Offset".

    Thanks for giving us this option.
    I've just done a very quick test and seem to be getting a strange display though. The finishing cut is messed up!
    Here's the gcode and I've attached my Profile too.

    (PLANETCNC-TNG 2)
    (ECAM V4 ***LATHE*** )
    (CREATED ON 24/03/2020 AT 14:28)
    (PART DESCRIPTION: BRASS BALL)
    (PROG NUMBER: 1)
    (STOCK O/D: 19.050)
    (STOCK I/D: 0.000)
    (STOCK LENGTH: 30.000)

    (------------------ TOOL LIST ------------------)
    (TOOL:EXTERN TURN TOOL [RN 0.2] )
    (TOOL:EXT GROOVE TOOL [L 2MM] [RN 0.1] )
    (TOOL:EXT TURN TOOL [RN 0.2] )
    (-----------------------------------------------)

    (SETUP 1)

    G07 G18 G21 G54 G64 G80 G90

    (FACE TURNING - ROUGHING)
    (EXTERN TURN TOOL [RN 0.2])
    (MAX Z TRAVEL: 1.000)
    (MIN Z TRAVEL: 0.000)
    (MAX X TRAVEL: 10.025)
    (MIN X TRAVEL: -0.200)

    G94 T10 G43 H10 M6
    G97 S1275 M3 M9
    G04 P2
    G0 X20.050 Z1.000
    G1 Z0.300 F125
    X1.000
    X-0.400 F62
    G0 X20.050 Z0.800
    G1 Z0.000 F125
    X1.000
    X-0.400 F62
    G0 X20.050 Z0.500
    Z1.000
    G53 X30.000 Z130.000
    M5
    M9

    (EXTERNAL TURNING - ROUGHING)
    (EXT TURN TOOL [RN 0.2])
    (MAX Z TRAVEL: 0.782)
    (MIN Z TRAVEL: -21.100)
    (MAX X TRAVEL: 10.025)
    (MIN X TRAVEL: 3.757)

    G94 T25 G43 H25 M6
    G97 S1250 M3 M9
    G04 P2
    G0 X20.050 Z0.500
    Z0.782
    X17.850
    G1 Z-5.664 F130
    X18.850 Z-5.164
    G0 Z0.782
    X16.650
    G1 Z-4.119
    X17.650 Z-3.619
    G0 Z0.782
    X15.450
    G1 Z-3.076
    X16.450 Z-2.576
    G0 Z0.782
    X14.250
    G1 Z-2.269
    X15.250 Z-1.769
    G0 Z0.782
    X13.050
    G1 Z-1.611
    X14.050 Z-1.111
    G0 Z0.782
    X11.850
    G1 Z-1.061
    X12.850 Z-0.561
    G0 Z0.782
    X10.650
    G1 Z-0.598
    X11.650 Z-0.098
    G0 Z0.782
    X9.450
    G1 Z-0.205
    X10.450 Z0.295
    G0 Z0.782
    X8.250
    G1 Z0.128
    X9.250 Z0.628
    G0 Z0.782
    G1 X7.614 Z0.282 F91
    G3 X8.250 Z0.128 I-3.957 K-8.582 F130
    X9.450 Z-0.205 I-4.275 K-8.428
    X11.850 Z-1.061 I-4.875 K-8.095
    X14.250 Z-2.269 I-6.075 K-7.239
    X16.650 Z-4.119 I-7.275 K-6.031
    X17.516 Z-5.146 I-8.475 K-4.181
    X18.600 Z-8.300 I-8.908 K-3.154
    G1 Z-8.500
    G3 X17.850 Z-11.136 I-9.450 K0.000 F91
    G1 Z-20.841 F130
    X18.850 Z-20.341
    G0 Z-11.636
    G1 X17.850 Z-11.136 F91
    G3 X17.516 Z-11.654 I-9.075 K2.636 F130
    X16.650 Z-12.681 I-8.908 K3.154 F91
    G1 Z-20.628 F130
    X17.650 Z-20.128
    G0 Z-13.181
    G1 X16.650 Z-12.681 F91
    G3 X15.450 Z-13.724 I-8.475 K4.181
    G1 Z-20.416 F130
    X16.450 Z-19.916
    G0 Z-14.224
    G1 X15.450 Z-13.724 F91
    G3 X14.250 Z-14.531 I-7.875 K5.224
    G1 Z-20.203 F130
    X15.250 Z-19.703
    G0 Z-15.031
    G1 X14.250 Z-14.531 F91
    G3 X13.050 Z-15.189 I-7.275 K6.031
    G1 Z-19.991 F130
    X14.050 Z-19.491
    G0 Z-15.689
    G1 X13.050 Z-15.189 F91
    G3 X11.850 Z-15.739 I-6.675 K6.689
    G1 Z-19.778 F130
    X12.850 Z-19.278
    G0 Z-16.239
    G1 X11.850 Z-15.739 F91
    G3 X10.650 Z-16.202 I-6.075 K7.239
    G1 Z-19.566 F130
    X11.650 Z-19.066
    G0 Z-16.702
    G1 X10.650 Z-16.202 F91
    G3 X9.450 Z-16.595 I-5.475 K7.702
    G1 Z-19.353 F130
    X10.450 Z-18.853
    G0 Z-17.095
    G1 X9.450 Z-16.595 F91
    G3 X8.250 Z-16.928 I-4.875 K8.095
    G1 Z-19.141 F130
    X9.250 Z-18.641
    G0 Z-17.428
    G1 X8.250 Z-16.928 F91
    G3 X7.847 Z-17.027 I-4.275 K8.428 F130
    G1 Z-19.069
    X18.750 Z-21.000
    G0 X20.050 Z-20.500
    Z0.682
    X8.514
    G1 X7.514 Z0.182
    G3 X17.416 Z-5.246 I-3.957 K-8.582
    X18.500 Z-8.400 I-8.908 K-3.154
    X17.416 Z-11.554 I-9.450 K0.000
    X7.747 Z-16.927 I-8.908 K3.154
    G1 Z-19.169
    X18.650 Z-21.100
    G0 X20.050 Z-20.600
    Z0.500
    G53 X30.000 Z130.000
    M5
    M9

    (CUT)
    (EXT GROOVE TOOL [L 2MM] [RN 0.1])
    (MAX Z TRAVEL: 0.500)
    (MIN Z TRAVEL: -18.800)
    (MAX X TRAVEL: 10.025)
    (MIN X TRAVEL: 2.900)

    G94 T12 G43 H12 M6
    G97 S1200 M3 M9
    G04 P2
    G0 X20.050 Z0.500
    Z-18.800
    X8.747
    G1 X5.800 F25
    G0 X20.050
    Z0.500
    G53 X30.000 Z130.000
    M5
    M9
    M2
    Attached Files Attached Files

  13. #13
    Join Date
    Mar 2017
    Posts
    1295

    Re: Lathe Tool Offsets

    Arcs are displayed incorrectly. I will fix this.

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