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1597Re: [mlathemods] Re: live center woes

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  • David Halfpenny
    May 2, 2006
      ----- Original Message -----
      From: "Ellis Cory" <ellis103@...>
      To: <mlathemods@yahoogroups.com>
      Sent: Tuesday, May 02, 2006 10:24 PM
      Subject: Re: [mlathemods] Re: live center woes

      > David wrote......It's pretty fundamental, David Halfpenny, that the
      > headstock center would be non-hardened because it turns with the work.
      > No need to go to the trouble and expense to harden it. That's got
      > nothing to do with its accuracy........
      > Not quite. Originally the 2 centres were both hardened and
      > interchangeable for both ends. As the work needed to be more accurate, it
      > was discovered that even putting the centre into the taper could give
      > different results, so they were kept soft so that they could be trued up,
      > however, that quickly caused a problem at the tailstock end. Hence
      > traditionally, one hard and one soft. You pays your money, you takes your
      > choice LOL
      > Ellis

      Just to add to Ellis' reply, what I had in mind was the ability to true up
      the headstock centre to eliminate any error in the headstock spindle -
      quite a consideration in the past.

      Of course, it won't help if the bearings are wobbly!

      David 1/2d
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