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Is the new high torque 20T GT3 pulley 8mm or 0.25" bore?

Discussion in 'General Talk' started by Elias Politis, Apr 20, 2016.

  1. Elias Politis

    Elias Politis Well-Known
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    The description of the bore size of the new high torque 20T GT3 pulley is not clear.

    GT3 Timing Pulley - 20 Tooth - High Torque Series

    ' This pulley has a clamp that locks onto the 8mm diameter rod/lead. '
    ' Bore Size: 0.25" '

    I suspect the former is true and the latter is a typo (possibly a copy paste from the old pulley specs? ). Can you please confirm which of the two is true?
     
  2. Mark Carew

    Mark Carew OpenBuilds Team
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  3. Elias Politis

    Elias Politis Well-Known
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    Thanks for clarifying this, Mark.

    May I ask then what is the difference between the new "high torque" and the old 20T GT3 pulleys?
     
  4. Elias Politis

    Elias Politis Well-Known
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    Ok, I just saw that the new one is 9mm wide vs the old one being 6mm.
     
    Mark Carew likes this.
  5. Mark Carew

    Mark Carew OpenBuilds Team
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    Hi Elias,
    The main thing is that it accepts the larger 9mm closed loop belt for the C-Beam reduction add on bundle thats coming soon.
    As of now all the parts needed to create the reduction system (pulleys belt plate, etc) are on the Part Store just not in the bundled form yet. ;)
    1 - GT3 Timing Pulley - 20 Tooth - High Torque Series
    1- GT3 Timing Pulley - 40 Tooth - High Torque Series
    1- GT3 Closed Loop Timing Belt - High Torque Series
    1- Belt Reduction Mount - NEMA 23 - High Torque Series

    1- Nema 23 or NEMA 23 High Torque stepper motor
    4 - 20mm M5 Screws (for mounting the plate)

    One really cool thing about this system is that with the stand offs added you can mount this upside down (vertical) to create for example a TV lift cabinet, with maybe one actuator on each side.
    This system will also allow for heavier Z axis routers and many, many more configurations.
    This reduction setup should really open a lot of doors for future Build ideas.


    OpenBuilds® C-Beam™ Reduction Add-On.jpg
    20160204_170141.jpg OpenBuilds su beta.jpg 20160204_170028.jpg untitled.175.jpg DSC04569.JPG

    20160204_165438.jpg
     
    #5 Mark Carew, Apr 20, 2016
    Last edited: Jun 9, 2016
    rozitt, snokid, UltiBots and 2 others like this.
  6. UltiBots

    UltiBots Veteran
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    Great upgrade!!! But... can't find the reduction plate on webstore. Link above fails :(
     
  7. evilc66

    evilc66 Veteran
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    I noticed that the plate has disappeared from the site too. What's the word on that?

    I wonder if it's from the email I sent with some suggestions on some changes to make it more flexible :)
     
  8. Mark Carew

    Mark Carew OpenBuilds Team
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    Hey guys,
    We are working on more testing on this system and will release it once we have everything completed.
    Thank you
     
  9. snokid

    snokid Veteran
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    I like this plate
    My camera slider I'm so worried I'm going to knock the stepper off carting it around, this would protect the motor.
    I don't need the reduction a straight 1:1 would be just fine.
    Did you publish the sketch up files for this?
    thanks Bob
     
  10. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Bob, if you are wanting 1:1 this will change the center-to-center distance about 0.6" which is beyond what the plate will allow. Creating your own plate is really not that difficult. Center-to-center distance can be calculated using - SDP/SI eStore and as this will work with any size pulley, you may be able to reuse pulleys you already have laying around.
     
  11. Blades

    Blades Journeyman
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    Is there any need for another wheel riding on top of the pulley to lock the belt onto the pulley?
     
  12. evilc66

    evilc66 Veteran
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    Not if the belt tension is set correctly (which you need to do to reduce/remove backlash). You will stall the motor before the belt jumps a tooth.
     
  13. Blades

    Blades Journeyman
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    Good to hear! Thanks do much !
     
  14. Eric Filomeno

    Eric Filomeno Well-Known
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    Hi,
    Has this been released? Can't seem to find in in the openbuildsparts store.

    thanks!,
    -Eric
     

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