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Thread: Aspire or Shopbot problem?

  1. #1
    Join Date
    Apr 2012
    Location
    Illinois
    Posts
    39

    Default Aspire or Shopbot problem?

    I am running a large sign foam sign on my Shopbot PRT Alpha with a 5hp spindle. I am using a 1/8" ball tip bit at 175 inches per minute. The component that I am running is a 3d wood grain running in the X axis. The problem is that I am getting ridges running in straight lines on the Y axis. about a 1/8" apart along the entire length.
    IMG_0476.jpg

  2. #2
    Join Date
    Sep 2006
    Location
    Garland Tx
    Posts
    2,217

    Default

    Those are very authentic looking surface planer marks!

    The regular spacing would look like a mechanical issue… But I don’t know. Let’s see what the 3D guys say.

    SG

  3. #3
    Join Date
    Apr 2013
    Location
    Kennebunkport, Maine
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    4,038

    Default

    If they don't show in the preview...90+ % of the time it's a machine problem.
    Use max simulation quality in the pull down, and we can at least eliminate one of the two.
    (NOT one of Steve's "3D guys
    scott
    Scott Plaisted
    2013 Desktop/spindle/VCP 9
    Maine

  4. #4
    Join Date
    Mar 2006
    Posts
    7,828

    Default

    It's not surface planer marks as you see the actual surface (top left, bottom) are above this wavy surface (you don't run sign foam thru a planer anyway). Depending on how you made your toolpaths (carved letters seperate from pocketing larger space, i'd say your stepover on this toolpath is too large. You would think the letters would show the same pattern but they don't.
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  5. #5
    Join Date
    Dec 2000
    Location
    Thorp, WI
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    2,653

    Default

    Drop the motors away from the rack and roll it along the X to see if you can feel the very consistent 'bump'. Check the X v-bearings. When replacing the motors, make sure that they are adjusted up into the rack properly. Would seem to be a perfectly placed 'bump' in the motion back and forth on the X axis.
    Scott

    If guns kill people, I guess pencils misspell words, cars drive drunk and spoons make people fat.

    "Those who hammer their guns into plows, will plow for those who do not" - Thomas Jefferson




  6. #6
    Join Date
    Sep 2006
    Location
    Garland Tx
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    2,217

    Default

    Ha!, jack…I in no way was suggesting that they were surface planer marks… just that they were authentic “looking” marks! So, if you need to simulate Planer marks in foam, we just need to figure out what t28c34 is doing!

    I think Scott is on the right track with worn bearings…

    SG

  7. #7
    Join Date
    May 2011
    Location
    ny
    Posts
    775

    Default

    Probably something jammed in a roller groove I had that happen machining insulation foam the stuff got into the rollers.

  8. #8
    Join Date
    Dec 2008
    Location
    Diamond Lake, WA
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    1,596

    Default

    Agree with Brian. Looks like something jammed in the V-groove bearing. That's the only way I can see getting that very consistent pattern.
    Don
    Diamond Lake Custom Woodworks, LLC
    www.dlwoodworks.com
    ***********************************
    Life is not a journey to the grave with the intention of arriving safely in one pretty and well preserved piece; But to skid in broadside, thoroughly used up, worn out, bank accounts empty, credit cards maxed out, defiantly shouting "Geronimo"!

    If you make something idiot proof, all they do is create a better idiot.

  9. #9
    Join Date
    Apr 2007
    Location
    Marquette, MI
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    3,373

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    I'm in for backlash in the Z axis. Adjust the pinion to rack or loose grub screw
    Gary Campbell
    GCnC Control
    GCnC411(at)gmail(dot)com
    ShopBot Controller Upgrades
    http://www.youtube.com/user/Islaww1


    "We can not solve our problems with the same level of thinking that created them"
    Albert Einstein


  10. #10
    Join Date
    Apr 2012
    Location
    Illinois
    Posts
    39

    Default

    Took a little slop out of the Z axis, but that didn't take care of it. With the power off, moving the X carriage I can feel some roughness in it. With the servo motors backed off, the carriage moves nice and smooth. Pulling the spur gears off I can see some wear in them. So I have new spur gears on the way. Ill try that out before I replace the racks.

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