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  1. #41
    Member Kenny Duval's Avatar
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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    I believe that only recommend that on machine initialization prior to homing.



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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    Quote Originally Posted by machinehop5 View Post
    Then, someone needs to rewrite the Mach2 , 3, and 4 manual's.
    A G49 became a standard code back 30 years ago and is just a carry over from when it was need, when you had to hand code everything on single line controls, you had to know how to code, and what each code is used for, there are a lot of miss used codes in the hobby area

    Mactec54


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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    Most CNC manfs recommend the G49 in the safety block as well as removing all other offsets.

    Just a thought, (;-) TP



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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    Quote Originally Posted by vmax549 View Post
    Most CNC manfs recommend the G49 in the safety block as well as removing all other offsets.

    Just a thought, (;-) TP
    It only has one function and is used with G43 H8 the H8 value in this case is Tool 8 what it cancels is the H8 value tool offset G43 activates the H value

    It serves no purpose, in the header block, other than a crash waiting to happen, it cancels the H8 value of the next tool that proceeds it, when used in a program and has to be used in the program with the tool that it affects, it is so you can use different tools with the same H value offset

    It is one of those codes that no one has a need for even with the simplest of controls like Mach3

    Mactec54


  5. #45
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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    The use of G49 is to cancel the current tool offset value and will NOT cause a crash if you are programing properly and setting up properly. G43 H1 sets up the machine for teh offset of Tool#1 . There is no point in using teh H1 for any other tool than Tool#1. Doing so could easily cause a crash.

    G49 has been around just as long as G43 which it cancels. Using it in a safety block insures the machine is not still using an active tool offset when it should not. Not clearing offsets on startup can cause a serious crash not the other way around.

    (;-) TP



  6. #46
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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    From the Mach 4 manual....
    "G49 – Tool Length Offset Cancel: Cancels the tool length offset. If no motion is commanded in the G49 block there will be no motion of the machine.
    https://www.machsupport.com/wp-conte...e%20Manual.pdf
    https://www.machsupport.com/wp-conte...3Mill_1.84.pdf

    Last edited by machinehop5; 01-25-2020 at 05:16 PM. Reason: links


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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    G92.1 vs G92...who is in control?



  8. #48
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    Default Re: Having problems with tool offsets, machine will only work with them turned off

    Quote Originally Posted by vmax549 View Post
    The use of G49 is to cancel the current tool offset value and will NOT cause a crash if you are programing properly and setting up properly. G43 H1 sets up the machine for teh offset of Tool#1 . There is no point in using teh H1 for any other tool than Tool#1. Doing so could easily cause a crash.

    G49 has been around just as long as G43 which it cancels. Using it in a safety block insures the machine is not still using an active tool offset when it should not. Not clearing offsets on startup can cause a serious crash not the other way around.

    (;-) TP
    That is not how it works at all, having it in the Header block does nothing at all unless it is associated with a tool offset yes it has been around for ever

    Here is some information on how it works https://cnc-programming-tips.blogspo...pensation.html

    There is not much more to it very simple if you have an understanding of how the codes are written

    G43

    The Tool Offset G-Code, also known as G43 is used to retrieve stored tool length offsets that can be utilized during an Automatic Tool Change ATC operation using the M-Command M06. This command allows for changing the tool without having to re-zero the Z-offset.

    Standard Format:

    G43 H00

    Here the number after the H represents the desired tool number. H0 is a valid tool number. To clear the command and set a zero value offset, the number 0 can be used in place of the H-command.

    In this example, Tool #5 will have its offset selected.
    G43 H5

    As a follow up example, Tool #2 will have its offset selected.
    G43 H2

    To clear all offsets and use zero offset, the following command is useful.
    G43 0

    An alternative to clearing the tool offset is to use the G49 command to clear the offset.

    This is how you would use it to be of any use

    Code Examples
    The usage of the G49 command is very simple and requires no extra parameters. In this example, we will set a tool offset using G43 and then immediately clear it using the G49 code.
    G43 H5
    G49

    The strange thing is there are no OffSetts to cancel on a machine start up or after a Program has run M30 at the end of the program will clear any OffSets that have been in use and also the first G43 H call will select the correct OffSet when you start your Program

    Mactec54


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Having problems with tool offsets,  machine will only work with them turned off

Having problems with tool offsets,  machine will only work with them turned off

Having problems with tool offsets,  machine will only work with them turned off