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Herringbone Gears for the Robo 3D

Discussion in 'Mods and Upgrades' started by Melody Bliss, Dec 18, 2013.

  1. Melody Bliss

    Melody Bliss New Member

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    Since the Robo 3D uses Greg Wade's (or is it Greg's Wade?) Extruder, it uses straight cut gears. But several reloaded/redesigned versions use Herringbone gears instead.

    Do we know what kind of herringbone gears we'd need if we wanted to just do a drop in replacement?
     
  2. Mike Kelly

    Mike Kelly Volunteer

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    I think the original thingiverse files from robo3d had the herringbone gears. they're just hard to injection mold and they dropped them. Lemme see if I still have the files.
     
  3. Melody Bliss

    Melody Bliss New Member

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    Thanks Mike. :)
     
  4. Mike Kelly

    Mike Kelly Volunteer

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    I did a little research and I didn't have any herringbone files. I swore I saw some on there at some point but the last update of their files was 4/4/13 so I don't know for certain.
     
  5. Ben R

    Ben R Active Member

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    2 people like this.
  6. scotta

    scotta Active Member

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    Mike you did see some pictures - the original kick starter champaign showed the herringbone gears somewhere.
     
  7. Ziggy

    Ziggy Moderator
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  8. James Harry

    James Harry Active Member

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    I took the SCAD files, measured the injection molded gears and matched everything as best I could. I have printed both, but the shaft hole on my small gear is a bit small and I haven't taken the time yet to open it up a bit. The SCAD file is the right dimensions, but i think I might have had a bit of shrinkage

    Here are the files if you want to try it out. The SCAD and STL files for this version are now posted on Thingiverse. I will be trying my own printed in ABS this week.
     
  9. James Harry

    James Harry Active Member

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    BTW, this is my first foray into using SCAD, so I probably didn't modify it in the most efficient way possible. Feel free to let me know how to make it more better!
     
  10. James Harry

    James Harry Active Member

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    In case anyone is interested, I've printed the gears several times, and made several tweaks. I'm now printing full time with them as printed from the files posted at http://www.thingiverse.com/thing:760093. Brief video at .
    [​IMG]
     
    #10 James Harry, Apr 29, 2015
    Last edited: May 1, 2015
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  11. James Harry

    James Harry Active Member

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    Oops, autocorrupt changed "now" to "not". I am using these full time now. The purple adds a little color, lol.
     
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  12. Peter

    Peter Member

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    Are 3D printed herringbone gears really better than the molded straight cut ones?
    Did it improve a known flaw or problem in your prints?
    If they are really that much better, i might print a set on our Objet Alaris and then cast them in resin using a silicone pattern mold. I do this stuff all the time. the very fine resolution and glossy results of that 3d printer are great for reproducible castings.
     
  13. James Harry

    James Harry Active Member

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    The herringbone gears have virtually no slop during movements and reversals. I like them fur the greatly reduced noise since they aren't "slapping" each other. I think it ends up with slightly more precision for extrusion.


    Usin' Tapatalk
     
  14. pitcjd01

    pitcjd01 New Member

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    Are the gears on the R1 okay to print in PLA, or would I be better off using ABS, maybe HIPS?
     
  15. Mike Kelly

    Mike Kelly Volunteer

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    PLA is fine since it shouldn't see very high temps
     

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