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Soft Limits and Max Travel

Discussion in 'General Talk' started by Rink, Dec 19, 2023.

  1. Rink

    Rink Well-Known
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    Good afternoon.
    I have limit switches installed at the far positive travel extent for each of the axes on my LEAD 1515. So I home at the right, back, top. I have homing and hard limits enabled and the homing works as it should.

    First, is it advisable to turn on soft limits? Any good reason not to do so?

    Second, if I do turn on soft limits, how do I designate max travel in $130-$132? Positive numbers (as in the absolute value of the travel distance)? Or negative numbers (as in coordinates in machine space)?

    I read the GRBL wiki but it was not clear on this point.

    Thx, rink.
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    You can, but if its an X32, make sure to:

    As there is currently a bug in CONTROL.

    Its not direction dependant its "what is the length of the axis" in essence - so positive number.

    Double read this bit Frequently Asked Questions
    If it doesn't make sense, have a snack, or a nap, then read it again. Repeat till it does - it explains the basic of negative quadrants which is a valuable thing to understand when you start doing more advanced work like multiple coordinate systems, macros, or even just to understand WHY homing is important
     
  3. Rink

    Rink Well-Known
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    Thank you.

    Actually, I had already read the info at the link regarding negative quadrants. I do understand that. Thanks for the reference.
     
    #3 Rink, Dec 19, 2023
    Last edited: Dec 19, 2023
  4. Rink

    Rink Well-Known
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    What is the bug in CONTROL?
     
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    The need to have $40=1. When fixed someday you can use $40=0 too. No biggie just mentioned so you don't forget to set $40=1 as well while enabling Soft Limits. If you want to view the full discussion follow the quote i provided above (arrow is a link)
     
  6. Rink

    Rink Well-Known
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    Thank you, sir.
     

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