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Max rpm for dead centers

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  • fciron
    replied
    Originally posted by Don Young
    It seems that the headstock center is always live, at least when the spindle is rotating. The tailstock center can be either live or dead. So if you have a dead one in the tailstock and you want to bring it back to life all you have to do is put it in the headstock. The ones with bearings are apparently immortal!!

    Or something like that.
    I've seen some that are better described as "undead".

    Leave a comment:


  • Don Young
    replied
    It seems that the headstock center is always live, at least when the spindle is rotating. The tailstock center can be either live or dead. So if you have a dead one in the tailstock and you want to bring it back to life all you have to do is put it in the headstock. The ones with bearings are apparently immortal!!

    Or something like that.

    Leave a comment:


  • Carld
    replied
    This is a live discussion about the dead.

    Leave a comment:


  • fciron
    replied
    Originally posted by Peter Neill
    I think you're dead right if I'm truthful, but then if we admitted that all the time we wouldn't have as much fun with baiting each other as we do.

    Peter
    OH, NO!

    I don't want to ruin our fun. I bet if I look hard enough I can find the word 'dead' attached to one of those rotating thing-um-ma-bobs. ;-)

    Leave a comment:


  • Peter N
    replied
    Originally posted by fciron
    I think this is an evolving terminology, it depends how old your books are.

    'Live' used to mean under power, similar to the way 'live' is used in electricity. So the thing in the headstock is the 'live center' the thing in the tailstock the dead center. As the use of a rotating ball bearing center in the tailstock has become the norm, it has seemed weird to call the moving thing 'dead' and the solid thing 'live' so the names have gotten reversed.

    If you go here http://www1.mscdirect.com/eCommerce/...A2lathe+center You will see a major catalog listing all solid centers as 'dead centers' and all rotating centers as 'live'.

    Alas, this crass modern world has not care for the correct use of words. If catalogs in the UK list these tools under their correct appellations I may consider emigration.
    I think you're dead right if I'm truthful, but then if we admitted that all the time we wouldn't have as much fun with baiting each other as we do.

    Peter

    Leave a comment:


  • Peter N
    replied
    Originally posted by angelo49
    Taken from the Hercus book.
    If it turns with the work it's live, with or without bearings.
    Angelo
    Nice try, but I can trump that
    According to Messrs A. Greer (C. Eng, MRAes), W.H. Howell (C. Eng., MI Prod E, MIQA, MISM) and F.R. Willmore (DLC Hons, M.Coll. H) who were senior lectures in Mechanical Engineering and Metalworking at some of the UKs formeost colleges, and who wrote the bibles for Mechanical Enginnering and Toolmaking Apprentices, then the following nomenclature applies:






    It's just that you lot over the water seem to have trouble with proper English, just like the way way you can't spell Aluminium correctly

    Peter

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  • fciron
    replied
    I think this is an evolving terminology, it depends how old your books are.

    'Live' used to mean under power, similar to the way 'live' is used in electricity. So the thing in the headstock is the 'live center' the thing in the tailstock the dead center. As the use of a rotating ball bearing center in the tailstock has become the norm, it has seemed weird to call the moving thing 'dead' and the solid thing 'live' so the names have gotten reversed.

    If you go here http://www1.mscdirect.com/eCommerce/...A2lathe+center You will see a major catalog listing all solid centers as 'dead centers' and all rotating centers as 'live'.

    Alas, this crass modern world has not care for the correct use of words. If catalogs in the UK list these tools under their correct appellations I may consider emigration.

    Leave a comment:


  • angelo49
    replied
    Taken from the Hercus book.
    If it turns with the work it's live, with or without bearings.
    [IMG][/IMG]
    Angelo

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  • tdmidget
    replied
    Read my post again lane. If it turns with the work, it is live. Are you saying that a center with roller bearings would be dead?

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  • Forrest Addy
    replied
    Originally posted by lane
    Ifen it aint got ball bearings it is dead. If it does it`s live , simple as that.
    I got a tomcat with the same attitde. The equipment he bears is his badge of authority and all the other cats better take notice.

    Wait, weren't we talking lathes?.

    Leave a comment:


  • lane
    replied
    Ifen it aint got ball bearings it is dead. If it does it`s live , simple as that.

    Leave a comment:


  • Carld
    replied
    Aw Geez, your right tdmidget, I don't know why I reversed them. I was taught long ago the headstock center is called live and the tailstock center is called dead.

    Leave a comment:


  • jugs
    replied
    Originally posted by Westline
    oh yes and a ass kicking machine just for good measure
    Adjustable stroke + adjustable speed -

    - it's also called a shaper, I'm sure you could also turn up some other useful attachments

    john

    Leave a comment:


  • The Artful Bodger
    replied
    Originally posted by Westline
    Is there a max rpm for dead centers?
    I guess I have a pretty crummy dead center since I got it with my lathe.
    On a job I just did I was machining 10mm leaded steel and I guess I was running it to fast, now it's called a dead center for more than one reason?
    Can carbide tip dead centers be run faster?
    Westline, my lathe came with two centres, one hard and one soft.

    If I understand correctly the soft one is for use in the head stock where it is skimmed in place to ensure an accurate centre with respect to the spindle axis. This centre will not stand much friction and it does not need to. The other centre is hard and is the one intended to be in the tail stock.

    If your centre is a bit munted just mount it in the spindle and give it a little trim.

    Nomenclature, the one in the spindle is the live centre and the stationary one in the tail stock is a dead centre, or so I thought, but now people call the revolving tailstock centre a live centre too. Which side of the Atlantic introduced this particular gem of confusion>

    John

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  • tdmidget
    replied
    Originally posted by Carld
    BTW, when turning between centers the center in the head stock is the dead center and the center in the tailstock end is the live center even though it will not turn and is stationary in the tailstock. Everybody calls is a dead center now I suppose as to not to confuse what is now a live center, which is a ball bearing center in the tailstock.
    Backwards Carl. A live center rotates with the workpiece. So what would be a dead center in the tailstock is a live center in the spindle because it is now rotating with the workpiece.

    Leave a comment:

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