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  1. #37
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    Quote Originally Posted by thkoutsidthebox View Post
    Hi all. I have come looking for info on ballscrews for my next machine, and this thread jumped out and bit me!

    I know the thread is fairly old, but I have one question that maybe Marchant Dice ( Who I intend to buy from ) or another knowlegeable person can answer:

    On the Marchant Dice website they have Ground, Rolled, and Trapezoidal ballscrews. Im thinking that Trapezoidal may just be science talk for 'Multi-Start'.....is this correct?

    Thanks.
    Trapezoidal is a thread form (buttress in cross section). Design feature: does not backwind under load.



  2. #38
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    Trapezoidal is the metric equivalent of ACME.



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    Quote Originally Posted by Zumba View Post
    Trapezoidal is the metric equivalent of ACME.
    I think we have a lunguage issue here:
    We manufacture Metric and Imperial / Inch Acme and trapezoidal threads.
    Acme thread form uses a 29 degree thread angle with flat apex and valley
    Trapezoidal form uses a 30 degree thread angle and can have a rolled / rounded apex.



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    Quote Originally Posted by marchantdice View Post
    I think we have a lunguage issue here:
    We manufacture Metric and Imperial / Inch Acme and trapezoidal threads.
    Acme thread form uses a 29 degree thread angle with flat apex and valley
    Trapezoidal form uses a 30 degree thread angle and can have a rolled / rounded apex.
    Are trapezoidal threads always metric dimensions or can they be also be inch?

    Chris



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    wooooooooooooooo

    very nice information , nice work

    cheers



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    I am sure I missed this somewhere,but does a ballscrew have a gear ratio?eg
    20mmdia pitch05mm
    Thanks
    Larry



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    Hi there,

    nice sumup swede!!

    may i bother you to ask if the ground acme leadscrew has "zero"backlash

    must be fun grinding a nut though.
    Should i imagine like 5' abrasive acme leadscrew wich the nut are driven from one end to another until the abrasive screw stops wearing ?

    THX alot



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    Ground Acme screws have backlash (plenty of backlash), but also have a higher potential for linear accuracy than ballscrews do. High quality Acme screws can undergo further correction and finishing, whereas additional finishing on ballscrews upsets the thread form.

    You can buy a hydrostatic leadscrew, which provides the positioning accuracy of an Acme screw with spit and polish, and the zero-backlash of a high quality ballscrew.

    However, hydrostatic leadscrews are ridiculously expensive. Direct, uncorrected positioning to a couple millionths of an inch doesn't come cheap.



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    were is a good place to purcase ball screws



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    any one know the difference between rolled ball screw and a precision one .



  11. #47
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    Difference 'tween rolled and precision are found in PRICE and ACCURACY, specifilally in how they spedify lead and repeatability..

    The supplier of/for the screw has specs regarding both - they vary from maker to maker and accuracy class to class.

    HIWIN is a good place to go for information on prrecision ground as opposed to rolled screws.



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    Default Precision for Rolled Ballscrews

    Your question, use of terminology is incorrect as you are trying to compare a product that has an association with a factor of itself.

    Precision is dependant upon a standard measurement, we call this class
    Unfortunately there a various standards through out the world.

    As a rule: Precision Ballscrews are equal to or better than Class 5, Rolled ballscrews fall into this standard when they can be assembled as preloaded.
    Due to the process of manufactuing a rolled Ballscrew spindle only a few spindles in each batch fall into this class.

    Lead is also a factor due to the plastic deformation process and heat treatment used when producing rolled spindles. Only certain leads are available as rolled.



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