Help with Fixture Offsets


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  1. #1
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    Default Help with Fixture Offsets

    My goal is to zero all my tool lengths to the table and use fixture offsets to set the height difference.

    So, I went into utilities, and I set all my tools to the table. This worked fine.

    Next, I went to fixture offsets and selected fixture 1, and I jogged my tool #1 to the work surface and to the corner I want to be 0,0. I selected that and stored it.

    So with selecting fixture E1. G0 X0 Y0 takes me to the corner of my part, wonderful.

    Since tool one is already there, I do an MDI of Z6.0 H1 E1
    It wants to drive the tool way below the work surface?

    I think where I'm going wrong, is when I set fixture offsets, I need to apply the H1 before doing the fixture Z offset or I would be off by that amount of tool 1?

    Any help?

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    Default Re: Help with Fixture Offsets

    If you set all the tool lengths to the table then the Z value in the fixture offset needs to be the distance from the table top to the Z zero surface. We use a tool length probe on our Fadal. The tool lengths are usually large negative values and the Z value in the fixture offset is a smaller positive value.
    Take note-- You may need to pick up fiture offse and tool length on the same line. G0G90X1.Y1.E1Z2.H1
    If the Z value in the fixture offset is greater than 4.0 inches and you try a position in X and Y with no Z offset the machine will hit the Z plus hard stop and crash. (been there , done that!)
    Hop all this helps.



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    Default Re: Help with Fixture Offsets

    set tool offset relative to the table. this will be a negative Z dimension.
    G0 H1 Z2.0
    this will move tool #1 2-inches above the table.

    set fixture offsets relative to the table too, but this will be a positive Z above the table.
    G0 H1 E1 X0.0 Y0.0 Z2.0
    this will move the tool #1 to 2-inch above the fixture offset #1.

    Last edited by everettengr; 01-15-2019 at 04:40 PM. Reason: typo


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    Default Re: Help with Fixture Offsets

    So, are we saying that I take the tool 1 length offset then touch my work and record that Z position and subtract them then that is what I enter into the fixture offset?

    Example: Tool 1 Length in the table is -18.500"
    My part is above the table 5.500"

    So my fixture offset is 5.500 which now makes tool 1 really -13.000?

    Last edited by rwskinner; 01-15-2019 at 11:22 AM. Reason: reworded


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    Default Re: Help with Fixture Offsets

    The way I do it with my Fadal in format 2 is to set all tools based off the table.

    Then I’ll go to T1 my 3d indicator. Next I will head to MDI and type
    g90
    G00 z12.0 h1
    (this will take my tool tip 12” from the table. Change z depending on what you need)

    Then hit jog and it still will account for the tool offset. Then I simply touch my z point and write that number down. Usually something like 5.5”.

    Next I just enter that into the fixture offset.

    The x and y I find with the offset utility normally.



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    Activation process everettengr's Avatar
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    Default Re: Help with Fixture Offsets

    Quote Originally Posted by rwskinner View Post
    So, are we saying that I take the tool 1 length offset then touch my work and record that Z position and subtract them then that is what I enter into the fixture offset?

    Example: Tool 1 Length in the table is -18.500"
    My part is above the table 5.500"

    So my fixture offset is 5.500 which now makes tool 1 really -13.000?
    Yes.
    your tool offset will have a negative Z.
    your fixture will have a positive Z and is the difference between the table and the fixture height (as you noted),
    but will generally also include a X and Y offset.



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    Default Re: Help with Fixture Offsets

    Quote Originally Posted by rwskinner View Post
    So, are we saying that I take the tool 1 length offset then touch my work and record that Z position and subtract them then that is what I enter into the fixture offset?

    Example: Tool 1 Length in the table is -18.500"
    My part is above the table 5.500"

    So my fixture offset is 5.500 which now makes tool 1 really -13.000?
    Exactly! When you combine fixture offsets and tool length offsets on the same line the machine does the math right everytime. The way I have my students do it is:
    1) set tool length(s)
    2) MDI G0G90 Z8.H1 (or something safe above the part)
    3) press "jog" do NOT depress manual. This leaves the tool length register active.
    4) jog the tool down until you touch the top of the part (the Z zero surface of your part.)
    5) write down the Z value shown on the screen.
    6) enter the recorded Z value into the fixture offset.

    Either way works just fine. Seems like I have to do alot of explaining both ways.
    Let us know if all this info works for you!
    Jim



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    Default Re: Help with Fixture Offsets

    Perfect. Yes, it seemed that is where I was getting messed up is after the MDI I was pressing Manual and it was jacking up my position. I will try again ! Thanks.



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    Default Re: Help with Fixture Offsets

    That worked perfect and using MDI the G0 G90 X0 Y0 Z2. H1 E1
    put my tool on the corner and 2" above the work. Great.

    Now I ran some simple test code, but it ran my Z above the CS position, like it's still using G53 coordinates.

    Code:
    %    (FADAL Program from Vectric)
    O1004
    N20G00G17G40G80G90
    N25T1M6    (Profile 1)
    N30G0X0.0000Y0.0000S0E1
    N35Z2.5000H1
    N40G0X0.0000Y0.0000Z2.500
    N45G0Z1.500
    N50G1Z1.0000F10.0
    N55G1Y-12.0000F25.0
    N60X12.0000
    N65Y0.0000
    N70X0.0000
    N75G0Z1.5000
    N80 T2 M6
    N85 G43H2
    N90 S0
    N95G0X0.0000Y0.0000Z2.5000
    N100G0Z1.500
    N105G1Z1.000F10.0
    N110G1Y-12.0000F25.0
    N115X12.0000
    N120Y0.0000
    N125X0.0000
    N130G0Z1.5000
    N135M5
    N140G0G80G90M5M9
    N145Z0 G53
    N150X0.0 Y8.5 Z0 E0 H0
    N155M1
    N160M30
    %
    Missing G43 on H1?

    Quote Originally Posted by Techman View Post
    Exactly! When you combine fixture offsets and tool length offsets on the same line the machine does the math right everytime. The way I have my students do it is:
    1) set tool length(s)
    2) MDI G0G90 Z8.H1 (or something safe above the part)
    3) press "jog" do NOT depress manual. This leaves the tool length register active.
    4) jog the tool down until you touch the top of the part (the Z zero surface of your part.)
    5) write down the Z value shown on the screen.
    6) enter the recorded Z value into the fixture offset.

    Either way works just fine. Seems like I have to do alot of explaining both ways.
    Let us know if all this info works for you!
    Jim




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    Default Re: Help with Fixture Offsets

    okay, I guess this is a Fadal deal. Anytime you change fixture it moves Z to Zero even when you don't tell it to?

    Bad code here...

    N25T1M6 (Profile 1)
    N30G0X0.0000Y0.0000S0E1
    N35Z2.5000H1

    Change it to...
    N25T1M6 (Profile 1)
    N30 G0 X0.0000 Y0.0000 Z2.5 H1 S0 E1

    And it works. I need to go fix the post so it doesn't do that anymore!

    Last edited by rwskinner; 01-15-2019 at 05:30 PM. Reason: deleted duplicate code


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    Default Re: Help with Fixture Offsets

    So I edited the Post Processor so it changed the position of some of the offset commands. It seems with Fadal, If you call a E# you better tell it where you want the X,Y, & Z !

    Here is with the fixed post that seemed to fix all my woes.....
    Thanks for everyone's help!

    [CODE]
    O1004
    N20G00G17G40G80G90
    N25T1 M6 (Profile 1 - Tool 1)
    N30G0X0.0000 Y0.0000 Z3.0000 H1 S100 M3 E1
    N35G0 X-4.0000 Y-4.0000 Z3.0000
    N40G0 Z2.0000
    N45G1 Z0.0000 F10.0
    N50G1 X4.0000 F50.0
    N55 Y4.0000
    N60 X-4.0000
    N65 Y-4.0000
    N70G0 Z3.0000
    N75 T2 M6 (Profile 2 Tool 2)
    N80 G43 Z3.0000 H2
    N85 S100 M03
    N90G0 X-4.0000 Y-4.0000 Z3.0000
    N95G0 Z2.0000
    N100G1 Z0.0000 F10.0
    N105G1 X4.0000 F50.0
    N110 Y4.0000
    N115 X-4.0000
    N120 Y-4.0000
    N125G0 Z3.0000
    N130M5
    N135G0G80G90M5M9
    N140Z0 G53
    N145X0.0 Y8.5 Z0 E0 H0
    N150M1
    N155M30
    %
    </CODE>



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    Default Re: Help with Fixture Offsets

    I had similar issues with mine with the head going up when I have it in format 1 and g90 default. The same program will run fine in format 2 default g91. If you have hsmworks there is a good post available from Autodesk.



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Help with Fixture Offsets

Help with Fixture Offsets