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New Eccentrics

Discussion in 'Announcements' started by Mark Carew, Feb 14, 2014.

  1. Mark Carew

    Mark Carew OpenBuilds Team
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    Hey guys just to let you know that the eccentrics are in stock and ready to ship!

    The eccentrics have been slightly redesigned for a more sturdy stance. (price remains the same ;) )
    They have been widened the collar extended and can now be adjusted with a 10mm wrench.
    The function and fit is identical to the previous eccentrics.
    This is an upgrade we have been wanting to do for a while, and now that they are complete we hope you will enjoy them.

    Part Store Link: http://openbuildspartstore.com/eccentric-spacers/

    The model for these can be found on the OX build model
    DSC03253__72769.1392408673.400.310.JPG
    Eccentric Spacer_Version_3.jpg
     
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  2. John Francis

    John Francis Well-Known
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    I'm having a problem using these with the mini v wheels. the larger face clamps the edge of the bearings causing the wheel to be locked. No rotation possible.
     
  3. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    John, that's the reason behind the extra shim that comes in the mini V-wheel kit. One goes between the spacer and the wheel. (The other is fitted between the bearings inside the wheel.)
    [​IMG]
     
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  4. John Francis

    John Francis Well-Known
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    well, darn, I designed a unique assembly of laser cut delrin based around the old design that didn't need an extra shim. Now I have to redesign, re-cut and wait for more shims. This was supposed to ship by this coming Friday. I hope I don't lose the account.
     
  5. Rick 2.0

    Rick 2.0 OpenBuilds Team
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  6. John Francis

    John Francis Well-Known
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    I'll give them a call and/or just order the shims and then have our sales guys smooth things over. Also, We need to have a different but related discussion that is non public. It involves buying bulk quantities, price breaks at quantity, etc...... Could someone please send me a PM so I can pass along my work e-mail?
     
  7. GrayUK

    GrayUK Master
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    John. Go to the top of the page and select, Members - Notable members - Kram242, and start a conversation with him. This is a Private Conversation between you and Mark.

    He'll be able to help somehow. :thumbsup:

    Gray
     
  8. GrayUK

    GrayUK Master
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    Hi Mark.
    Will I be getting the new ones or the old ones?

    Gray
     
  9. Mark Carew

    Mark Carew OpenBuilds Team
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    Hello Gray and John,
    They are all the updated new wide stance versions now.
    Thank you
    Mark
     
  10. Derwin Palacpac

    Derwin Palacpac Well-Known
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    Mark, is the cam lobe taller than previous?
     
  11. Mark Carew

    Mark Carew OpenBuilds Team
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    Hello @Derwin Palacpac
    In the new standard wide version (and metric) we have now the cam lobe taller, again for a more stable platform @ 2.50mm and the post height is 6.35 (1/4")
    The new upcoming metric version will have a post height of 6mm
    Mark
     
  12. Derwin Palacpac

    Derwin Palacpac Well-Known
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    Fantastic, the issue im having has to do with the amount of weight the router/spindle has. Because i used a water jet to machine my z plates, i think it bored the hole too big which resulted in the spacers being a little too far apart, thus resulting in the router bit not squared vertically. so at max the eccentics i have needs a taller lobe and the wheels can grab onto the extrusion tighter.. Right on.. I was worried that i would need to mill another plate or revert to using the v-wheels. I'll keep an eye out for the taller metric eccentric in the parts store..:thumbsup::D
     
  13. Mark Carew

    Mark Carew OpenBuilds Team
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    Hello @Derwin Palacpac I hope I haven't giving off the wrong impression that the new eccentrics will have a larger swing on the wheels eccentrics adjustment they will be the same. You may need to move one set of holes in to make up for the slop in the water jet cut.
    The spacing on any given plate should be as shown in the picture below
    VSLOT plate_hole spacing.jpg
    or in the resource model here: http://www.openbuilds.com/resources/sketchup-v-slot-model.57/
    Hope this helps
    Mark
     
  14. Lee Saferite

    Lee Saferite Journeyman
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    Are the new metric parts (concentric and eccentric spacers) coming to the store soon?
     
  15. Mark Carew

    Mark Carew OpenBuilds Team
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    They are in the works, we are working on the prototypes and will be testing them out for complete production soon.
    So no ETA as of yet but I will update once we see that its all a go.
    Thanks
     
  16. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Mark,

    The drawing in the parts store [​IMG]
    needs updated to match the new sketch. [​IMG]
     
  17. Mark Carew

    Mark Carew OpenBuilds Team
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    ack! yes it does thank you Rick :) I will update it
    Thanks again @Rick 2.0
     
  18. John Francis

    John Francis Well-Known
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    Just checking in, I had another issue. With the mini wheels after adding the additional shim, the eccentric spacer scrapes the v-slot extrusion when adjusted into the slot. I re-designed my plate so that it wasn't needed anymore.
     
  19. Mark Carew

    Mark Carew OpenBuilds Team
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    Thanks for the tip John, and glad to hear your custom plate now works properly. :thumbsup:
     
  20. John Francis

    John Francis Well-Known
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    true, custom. It's a dual plate truck assembly with panels for squaring, etc.... I used a dual flexure tensioner system to keep the wheel with a minimum of .125 lbs of force pushing it into the slot. After .009" of deflection the tensioner bottoms out against the main body of the plates keeping the plastic well below yield point and accuracy very high. . pretty nifty..
     
  21. Mark Carew

    Mark Carew OpenBuilds Team
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  22. John Francis

    John Francis Well-Known
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    I could make a general one. This one is industry specific, but I'm also working on a 3d printer in my spare time, so i'm sure a more general version will make it into there.
     
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