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Thread: Anti - Backlash Nuts

  1. #49
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    It is sort of working. If I tighten it up more(to the max), (with the spacer) it stops working and just locks.



  2. #50
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    Ok then, try adding another spacer, then tighten it.



  3. #51
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    These nuts keep on locking. Ive tried 1 spacer to 8 spacers...



  4. #52
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    Just a quick thought, you are using the two screws to tighten the nuts together, not turning them? If you turn the nuts, they will always lock. I'm sure you know what I mean, but check back to Anoels picture, you see the two screws? You do have those in place don't you?!



  5. #53
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    Of course! Im not that thick! lol.



  6. #54
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    Sorry, just checking! For now then, I would leave out the spacers, just screw the two nuts together, and use it. As you notice backlash developing with use of your machine, you can add the shims.



  7. #55
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    Hmm, what I have been doing, is tightening the nuts together, until they are approx 1 thread away and then they will easily turn. I then have been tightening the screws, with the spacer in between the 2 nuts. This was the correct way right?

    I think that I will invest in some of the brass material as I have put quite a lot of effort into these nuts now.

    Last edited by Mhiran; 08-28-2003 at 09:45 AM.


  8. #56
    Registered ljoe1969's Avatar
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    How long do plastic nuts made this way last?



  9. #57
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    Hmm, what I have been doing, is tightening the nuts together, until they are approx 1 thread away and then they will easily turn. I then have been tightening the screws, with the spacer in between the 2 nuts. This was the correct way right?
    I was playing at the hardware store, the other day...found some bell washers which provided some "spring" between two nuts. I also played with a neoprene washer, for the same purpose.

    Wouldn't it be possible to use some standard nuts, of whatever thread type, and just crank them down tighter, till these "squishy" spacers gave the right spacing between them? There'd be a little bit of spring, too, to help adjust for the inconsistencies in thread spacing, if you used cheaper lead screws.

    It seemed to work pretty well on the allthread at the store...of course, I didn't have a dial indicator with me! ;-)

    -- Chuck Knight



  10. #58
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    The problem you will get trying to use bell washers is that they can (and will) "give" under varying loads. The two nut technique gives you true rigidity while the bell washers don't. Your goal is to have tight positioning regardless of the load your nut/screw combination might encounter.

    FYI - bell washers are often used on nuts in everyday applications to help make sure they don't back off due to vibration and such. In these applications, if the nut were to back off just a little, the bell washer would take up the slack and insure that there is still pressure between a nut and the surface it is suppose to be pressing against. If the bell washer weren't there, the system would be loose the very moment nut moved at all. This technique is really nice when used in high vibration applications where the nut has to be taken on and off on a regular basis.

    Steve



  11. #59
    Registered HuFlungDung's Avatar
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    I wonder if Mhiran ever got the anti-backlash nut working?

    It sounded as though he was locking the two nuts together with a spacer in between. Of course, it will always lock up if you do that. The nuts are not jammed together, but are locked against mutual rotation, at such a seperation that prevents undue binding on the screw, yet eliminates most of the backlash.

    First you get good, then you get fast. Then grouchiness sets in.

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  12. #60
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    I don't know about Mhiran but tread did help me.



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