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Posted by David Littlewood on May 25, 2008, 5:12 pm
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>On Sun, 25 May 2008 11:59:12 +0100, David Littlewood
>
>>>Dave
>>
>>Hm, not a terminology I have ever seen used before. to me, a dead centre
>>is solid, a live centre has bearings and rotates independently of the
>>taper it is in. This is also the terminology used in the tool
>>catalogues. Dead centres come in two forms, soft (for use in the
>>headstock, can be turned in situ to ensure absolute concentricity) and
>>hard (for use in the tailstock, to resist wear as the part rotates
>>against it). It is IMO worth using TC tipped ones for the latter, they
>>resist scoring very much better.
>>
>>I understand it is the soft dead centres which have become difficult to
>>source.
>>
>>David
>
>Your sources are wrong!
>
Mark,
Not understood. Are you disputing the terminology (in which case we'll
have to agree to differ) or are you saying soft dead centres are easy to
find (in which case some pointers might help those who are looking for
them - not me, I have one and not yet felt the need to buy any more).
David
--
David Littlewood
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