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I give up

Discussion in 'Troubleshooting and Build Support' started by dhc8guru, Sep 1, 2011.

  1. dhc8guru

    dhc8guru Member

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    I don't know what to do? Since I have good luck with the machine in the morning while the shop is cool,
    this morning I decide to run some wing core blanks. Everything is running fine, I cut four blanks, they all are the same size. Then I measure there lengths. They are suppose to be 18.75". These are all 19.25. WTF? I go back and check the caliberation on the Y axis. Set 1",checks 1". I pull out the tape measure and caliberate at 4". Checks out to be 4.25. Do it all again at 10", checks out to be 10.50".
    This machine couldn't hit the broad side of a barn at 10 feet.
    Anyone want a Phlatprinter for cheap? Works great as long as long as your parts are smaller than 2"
     
  2. TigerPilot

    TigerPilot Well-Known Member

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    dhc8guru, I had problem on my y-axis too until I found out that the problem was my pulley on the stepper. It was loose, not allot but just enough to slip along the flat part of the shaft. I couldn't believe it happened to me but it did and I felt like a klutz.

    I think you are using the CNC USB. I don't use it so I can't help you in that regards

    BTW, I'll give you $200 for this useless machine! :D :D :D Plus shipping, of course! :D :tease:
     
  3. dhc8guru

    dhc8guru Member

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    At $200 I would be ripping you off. :lol: Mechanically the machine is fine and not the issue. There is something off in the electronics.
    I just replaced the Y stepper motor the other day thinking that would solve my Y axis issues. The pulley seems fine. I recaliberated the Y axis at 20". Now my wing cores are coming out to the right length, actually they are overall dimensionally bang on. I decided to try cutting out some fuselages. They turned out crappy. Whats really odd is I have two separate g-codes of the same fuselage both take different path's to achieve the same end result. One cuts completely inaccurate the other one is pretty close, like within .010. I don't know what it is about complex shapes that is making the machine loose it's mind. Maybe time to change software.
     
  4. Kroko

    Kroko Member

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    Can you send me two g-codes for same fusselage that give different results and your .settings file.
     
  5. Kroko

    Kroko Member

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    Yesterday, when I cut first plane I noticed that end position was not same as start. X axis was about one inch off.

    This seemed very similar to your problems when blanks were too long. So I did some tests.
    I moved machine to start position and then I made a mark on drive belt. If after cutting this mark is at same position then motors moved correctly and there were no lost steps.

    Then I air cut Lil Ripper again. Like first time X position was about one inch off. But marks on toothed belt were at exact position!!!

    So software returned motors to exact start position but material was one inch off. I expected that software and controller will work correctly. They are used in many high precision applications where such error would be noticed right away.

    Only explanation I can think for this situation is, that depron is slipping on X rollers.

    Andrej
     
  6. Kroko

    Kroko Member

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    One other thing. I noticed that many users are frequently recalibrating controller. There is no need for this unless machine mechanical properies have changed.

    Because recalibration seems to help and machine is always the same this makes no sense.

    Unless different temperature, humidity and diferent materials cause different slipping every time.
     
  7. dhc8guru

    dhc8guru Member

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    I sent the files.
    My x-axis is returning within roughly .010 even running the full length of a 48" board. Y on the other hand is an issue. I need to inspect the mechanical side of it just to be sure nothing is off. I am hoping the new driver board cures my problems.
    I only recheck my caliberation when something seems way off.
     
  8. kram242

    kram242 Administrator Staff Member

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    Don't give up!
    I have been working on new settings that I hope will be a big help. First I will be talking with planet-CNC to double check everything with them, but so far it has made a big improvement on the over all results of the cuts I am seeing. :good:
    I will be posting them soon.
    Thank you
    Mark and Trish
     

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