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  1. #21
    Member ZASto's Avatar
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    Default Re: Need STL FILE

    Your code is perfectly fine, as Gerry also noted.
    Something with your Z zero might be wrong.

    BTW what are your tool offsets? Your code is calling for one:

    N140 G00 G43 Z0.8000 H1


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    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    GER,
    It’s difficult to tell the Z depth but it looks like 0.040” from the material surface.
    G code cutting between 0.020” and 0.030”. That’s should be about right because it’s cutting on a 3D radius of about 3”, and The cut width across the radius is 0.700”
    What do you mean my Z is in the wrong place?

    The finish cutting will be on a wooden sword where the radius is about 3”. The Z zero setting will be made from the surface of the sword and 0.020” deep.

    Hager



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    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    Quote Originally Posted by ZASto View Post
    Your code is perfectly fine, as Gerry also noted.
    Something with your Z zero might be wrong.

    BTW what are your tool offsets? Your code is calling for one:
    Zasto.
    Offsets, I have never used offsets on the CNC. Is that something that is associated with cutting on a 3D surface?

    Something wrong on the Z? that was the first thing I checked with a indicator, the travel over one inch was off less than 0.001”.

    My friend wants me to Vcarve his Chinese name (characters) on the surface of his wooden training sword. The sword cost $65.00 and I’ve got one shot to do it right. I have Vcarve hundreds of flat signs and never had this kind of depth issue, but then this is my first try at cutting on an existing 3D surface.



  4. #24
    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    Quote Originally Posted by ger21 View Post
    Your Z zero is in the wrong place.
    The g-code is only cutting between .02 and .03 deep.
    After it finishes cutting too deep, jog the Z axis down to the surface, and see what the DRO is displaying?
    GER, what do you mean my Z is in the wrong place, could you give me some more details on that and where the Z should be.
    Thanks
    Hager



  5. #25
    Community Moderator ger21's Avatar
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    Default Re: Need STL FILE

    You need to set Z zero so the tip of the tool is just touching the wood at the high point.

    Gerry

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  6. #26
    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    Quote Originally Posted by ger21 View Post
    You need to set Z zero so the tip of the tool is just touching the wood at the high point.
    Thanks for responding GER, yes that’s where I trying to describe where I set it.
    Zasto said that I was using a Z offset, I’ve never knowingly used an offset. Is that’s what causing it to cut deeper than 0.020”?

    I’m just about ready to give up setting a Z depth the way I have (and how Vectric says to) for years and set the Z axis zero 0.020” above the surface in order to have the V cut be 0.020” into the surface. But I’m kinda afraid to because I’ve got one shot to Vcut my friends sword, and don’t want to spoil it.

    Looking closely at the bottom of the V cut it is not making a clean V cut, it seems to be cutting on each side of the Vector but not running in the center to clean that area out.
    Do you know why this is happening? I and setting the V depth to a flat bottom of 0.020”.

    Attached Thumbnails Attached Thumbnails Need STL FILE-4036db74-473c-4398-a601-01fd6d6b3818-jpg  


  7. #27
    Member ZASto's Avatar
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    Cool Re: Need STL FILE

    As I wrote, your G-code is using an offset:

    N140 G00 G43 Z0.8000 H1 <- added spaces for readability
    N140G00G43Z0.8000H1

    Second, from your image it looks that you are using ball nose bit, not V bit as the code was generated for.

    This are the comment lines at the beginning of your G-code:

    ( CHINESE NAME 650 20 deep )
    ( File created: Monday November 02 2020 - 08:21 AM)
    ( for Mach2/3 from Vectric )
    ( Material Size)
    ( X= 10.000, Y= 10.000, Z= 1.000)
    ()
    (Toolpaths used in this file
    (CHINESE NAME 650 20 deep)
    (Tools used in this file: )
    (1 = V-Bit {60 deg 0.625"})


    Check in Mach 3 for Height offset for tool #1

    Attached Thumbnails Attached Thumbnails Need STL FILE-mttable-png   Need STL FILE-ttable-png  
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  8. #28
    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    Quote Originally Posted by ZASto View Post
    As I wrote, your G-code is using an offset:

    N140 G00 G43 Z0.8000 H1 <- added spaces for readability
    N140G00G43Z0.8000H1

    Second, from your image it looks that you are using ball nose bit, not V bit as the code was generated for.

    This are the comment lines at the beginning of your G-code:

    ( CHINESE NAME 650 20 deep )
    ( File created: Monday November 02 2020 - 08:21 AM)
    ( for Mach2/3 from Vectric )
    ( Material Size)
    ( X= 10.000, Y= 10.000, Z= 1.000)
    ()
    (Toolpaths used in this file
    (CHINESE NAME 650 20 deep)
    (Tools used in this file: )
    (1 = V-Bit {60 deg 0.625"})


    Check in Mach 3 for Height offset for tool #1
    As I said before I haven’t intentionally added an offset, I have never used an offset in 10 plus years. I have no idea how it got there.
    What does that offset do?
    Do I need to just delete that offset line?

    Yes it is a V bit not a ball nose.

    You say check in Mach3 for height offset for tool no 1. I looked in Mach3 and the table looks exactly like the one you posted above.

    Any suggestions?

    Thanks for taking the time to respond
    Hager



  9. #29
    Member ZASto's Avatar
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    Cool Re: Need STL FILE

    Ok, the offending line that is calling for offset is in post processor.
    Just edited it and reformatted a bit.

    Place the post processor file in: c:\Program Data\Vectric\...\V8.5\My_PostP\
    ... identifies your software, I use Aspire

    And, attach your Chinese graphics that you created so that I can try to make a simulation

    Rename the extension of this file from .txt to .pp

    Attached Files Attached Files
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  10. #30
    Community Moderator ger21's Avatar
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    Default Re: Need STL FILE

    If there is no length value in the tool table, then the tool length offset is not the problem.
    It's included in every vectric post processor, and it's likely been in every g-code file you've ever created in V Carve Pro. So again, probably not the problem.

    Gerry

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  11. #31
    Community Moderator ger21's Avatar
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    Default Re: Need STL FILE

    3. Instead of cutting 0.020” into the material it cut about 0.060” into the material.

    My problem is the V bit is cutting deeper than the 0.020” in input into the flat depth.
    Watch the Z axis DRO while it's cutting, and you should see that it never goes deeper than about .038".
    Because of the curved surface, the depth will be .020 at the highest point (center), and get deeper as it goes down the curve to maintain a constant depth of .02.

    If you are testing on flat material, it will be cutting twice as deep at the edges, but you won't see that on the curved surface.

    The g-code does not go deeper than .038-.039", so if it's cutting deeper, either the machine is losing steps, or the Z zero is set incorrectly.

    Gerry

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  12. #32
    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    Quote Originally Posted by ZASto View Post
    Ok, the offending line that is calling for offset is in post processor.
    Just edited it and reformatted a bit.

    Place the post processor file in: c:\Program Data\Vectric\...\V8.5\My_PostP\
    ... identifies your software, I use Aspire

    And, attach your Chinese graphics that you created so that I can try to make a simulation

    Rename the extension of this file from .txt to .pp
    Here is the Chinese name in a Jpg format hope that will work for you

    Attached Thumbnails Attached Thumbnails Need STL FILE-h-chinese-name-jpg  


  13. #33
    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    heres the size, location and orientation on the Chinese name.

    Attached Thumbnails Attached Thumbnails Need STL FILE-chinese-name-size-location-jpg  


  14. #34
    Member ZASto's Avatar
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    Cool Re: Need STL FILE

    From your picture, it looks that you have some parameters wrong in tool settings in Aspire.
    Your step over is too big and your depth of cut is shallow.

    I can replicate the artifacts that are visible on your photograph only if I set depth to 0.05" and step overs as per attached image.

    Attached Thumbnails Attached Thumbnails Need STL FILE-artefacts-jpg   Need STL FILE-artefacts-png   Need STL FILE-tooledit-png  
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  15. #35
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    Default Re: Need STL FILE

    Could we have an image of your tool?I suspect it may not have a sharp point.I have tried engraving with such a tool and it didn't work too well,so I bought a small range of engraving tools that did come to a sharp point and it helped a lot.The big giveaway was that attempting to engrave a font with serifs had a zone in the serifs that went outside the outline of the lettering;in this case there are no serifs but the absence of a sharply defined line at the bottom of each symbol seems to be a clue.



  16. #36
    Member ZASto's Avatar
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    Cool Re: Need STL FILE

    V carving could be done even with conical ball nose bits, as in attached pictures, but it depends on parameters.
    First one is with step overs of 60% and 80%, second one with step overs 25% and 80%.
    Bit used is conical ball nose 16 degrees R0.25mm (0.01").

    Attached Thumbnails Attached Thumbnails Need STL FILE-mrchipsconical-jpg   Need STL FILE-mrchipsconicalok-jpg  
    Make no mistake between my personality and my attitude.
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  17. #37
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    Default Re: Need STL FILE

    Thank you for reinforcing my point that the tool shape needs to be accurately defined in order to achieve the desired result.



  18. #38
    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    Quote Originally Posted by routalot View Post
    Could we have an image of your tool?I suspect it may not have a sharp point.I have tried engraving with such a tool and it didn't work too well,so I bought a small range of engraving tools that did come to a sharp point and it helped a lot.The big giveaway was that attempting to engrave a font with serifs had a zone in the serifs that went outside the outline of the lettering;in this case there are no serifs but the absence of a sharply defined line at the bottom of each symbol seems to be a clue.
    I know what your talking about some so called V bits are sharp in the X axis but have a flat in the Y.
    The bit o was using is sharp in both the X and Y directions..
    Photo attached

    Attached Thumbnails Attached Thumbnails Need STL FILE-a49562a0-350a-444a-8ae4-3f51ca0e3f4a-jpg  


  19. #39
    Member ZASto's Avatar
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    Cool Re: Need STL FILE

    If you have step overs wrongly set, you will have s****y outcome, and as you wrote, you have only one bullet

    Attached Thumbnails Attached Thumbnails Need STL FILE-vbit-png  
    Make no mistake between my personality and my attitude.
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  20. #40
    Gold Member Mr.Chips's Avatar
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    Default Re: Need STL FILE

    Quote Originally Posted by ZASto View Post
    If you have step overs wrongly set, you will have s****y outcome, and as you wrote, you have only one bullet
    What step over would recommend?



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