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Spindle designations

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  1. Anonymous
    Unregistered

    Hello, I just became a member of Shop Doc forum today, and I wish to find some information about some machining questions I have. I work as an operator of CNC machines when I can, so I try to keep up with the industry as much as possible.
    I visit the various websites selling and advertising machines and notice that they usually have listed in the specifications the types of spindles that the machines have installed. They are always listed as a code number, such as
    A2-6 or A2-8. This has me wondering how the spindles are measured, or identified. Can someone out there tell me how they are differentiated, measured or identified? I don't know the first thing about how to identify them. When I work on a vertical mill-drill, the boss usually just shows me the tool cart and tells me to use those tools. The holders look all the same to me; some may be larger or smaller than others. I see that the code is used for lathe spindles as well.
    I appreciate any information someone can provide me on this issue. Remember, I'm just an operator, with little set-up experience. I've mounted tools in holders before and set them on the "Z" axis, and have used the edge finder for the "X" and "Y" axes, and have done some tool setting on lathes, but this spindle nomenclature has me stymied. Thanks for the help.

    Silversteve

    Posted 3 years ago #
  2. Anonymous
    Unregistered

    Hi Silversteve,

    The spindle designations of A2-6, A2-8, etc refer to the locating and fastening dimensions on the spindle face, used to mount a chuck, collet chuck, or other workholding devices.

    Here is a link to a chart on Ktagawa's web site that shows some of the more common spindle mount designations and the relevent dimensions - http://www.kitagawa.com/?tabid=99

    From the designation you can usually make some safe assumptions about the spindle, such as bar capacity. But there are exceptions, so it's best to check the stated bar capacity with the machine tool builder.

    Regards,

    Dan

    Posted 3 years ago #
  3. Anonymous
    Unregistered

    Silver,

    It might be helpful for you to know that the A2-6/8 designation is for turning machines. If you can get your hands on a Machinery Handbook, this will explain the design. In addition, you will find many other designations. When you are using milling/drilling machines, there will be other tool holding options such as CAT, BT, R-8, and many others. The standard is loose and you will eventually learn each through experience. Within each of these groups you also have collet designations - that will prove to be even more fun! I might suggest you find a tooling catalog (Kennametal, Sandvik, etc.) as they are typically full of great information and pictures. Good luck with your search for knowledge as this is a great industry despite what you might read!

    Posted 3 years ago #

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