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Thread: Live center in live tailstock?

  1. #1
    qwikturnin is offline Aluminum
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    Post Live center in live tailstock?

    Does anybody have any thoughts on using a live center in a tailstock that has a bearing? Good? Bad? No big deal?
    Lathe came with a dead center in the tailstock.

    Thanks for your thoughts.

    Robert

  2. #2
    Limy Sami is offline Diamond
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    Default

    ?????Sorry you've lost me there, more info or possibly a sketch / pic would help.
    i_r_machinist likes this.

  3. #3
    RJT
    RJT is offline Stainless
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    Glad I'm not the only one who doesn't follow that. A live center has bearings, but I've never seen or heard of a tailstock with with bearings.

  4. #4
    wippin' boy is offline Diamond
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    I've never seen or heard of a tailstock with with bearings.
    common in bigger and higher dollar/heavier duty machines

    as far as putting a live center in a live tailstock
    i seen it done many times to bypass a locked up live tail stock bearing
    not sure why else you would do it

  5. #5
    Andrew_D is offline Cast Iron
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    So the tailstock quill rotates???

    Hmm....learn something new every day...

    Andrew

  6. #6
    rbcmetalwork is offline Aluminum
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    Can the tailstock quill be locked to allow drilling?

  7. #7
    qwikturnin is offline Aluminum
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    Post

    Yes the machine in question is a 1992 mori seiki TL-40 that is sitting behind the Mazak 450m that i run daily. The mazak also has a "live" tailstock.
    I have only used dead centers in it.
    I have been at this company for a year and nobody has run the TL-40 (maintenence issues). Walking by i happened to notice the live center in the quill and thought it rather strange to have a live center in a tailstock with bearings.
    Probably the last fellow who worked here had some strange reason for using it

  8. #8
    qwikturnin is offline Aluminum
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    Post

    Quote Originally Posted by rbcmetalwork View Post
    Can the tailstock quill be locked to allow drilling?
    No the quill cannot be locked to allow for drilling. But that would be sweet!
    I believe there are some Mazaks that have that option but I have yet to see one or hear from anyone who has used one. Apparently besides drilling you can hone as well!

  9. #9
    Ox's Avatar
    Ox
    Ox is offline Diamond
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    I have a big one like that - and the big bearings would git hot. This one has interchangeble heads on it. No MT at all.

    I removed the cartridge and made a plug with a taper in it and stuffed a smaller (#5 MT) center in it. Works better for smaller D / higher speed apps IMO.


    -------------

    Think Snow Eh!
    Ox

  10. #10
    kappullen is offline Plastic
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    Default Lodge and Shipley lathes

    Lodge and Shipley long bed lathes used to have roller bearing morse
    sleeves built into the tail stock to take either a dead center, or drill.

    These spindle centers had real heavy duty bearings.

    There was a keyed locking collar that fit over the tail stock spindle
    with a slotted hole to lock the sleeve which had flats.

    Live centers introduce a lot of overhang for large heavy shafting
    leading to chatter and other problems.

    A live center failure will real quick lead to a catastrophic
    situation.

    If both sets of bearings are good the effects will be minimal.
    Two poor bearings rotating at random will induce various finish problems.

    Kap

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