Regrinding live centres

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Subject Author Date
Regrinding live centres Tim Leech 05-20-2008
Posted by dave sanderson on May 24, 2008, 3:19 pm
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>
> >wrote:
>
> >>I want a very small MT2 live centre and there is a design in Mr Sparey's
> >>Lathe book. My thought was to get a stub arbor as the starter for ten then
> >>machine to size and fit bearings. This is hobby use only and then
> >>occasional. Is there any flaw in this approach?
>
> >>Steve
>
> >Why do you need to fit bearings to the live centre?
>
> >Just put the stub arbour in the headstock. Turn a 60 degree taper on it and
> >use it in the headstock without removing it. Instant live centre :-)
>
> >Next time you mount it in the headstock, turn another half thou off the taper
> >to clean it up and ensure concentricity. Works very well for me once I
> >discovered that no one seemed to be selling live centres any more.
>
> Mark,
>
> I may be missing some subtle point here, but there are plenty of live
> centres around, e.g.
>
> http://www.arceurotrade.co.uk/Catalogue/Centres
>
> http://www.chronos.ltd.uk/acatalog/Chronos_Catalogue_Lathe_Taper_Tool...
> _70.html
>
> The sets with interchangeable points may be a suitable solution for the
> OP. Thought about getting one for myself a few times.
>
> David
> --
> David Littlewood

Yeap, your missing a subtlety. The terminology 'live center' can (and
I believe 'properly' is)
indicating the one in the headstock, which turns with the work, as
opposed to the dead center
in the tail stock which doesnt.

Dave

Posted by Steve on May 24, 2008, 4:43 pm
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>>
>> >On Fri, 23 May 2008 15:04:06 +0100, "Steve"
>> >wrote:
>>
>> >>I want a very small MT2 live centre and there is a design in Mr
>> >>Sparey's
>> >>Lathe book. My thought was to get a stub arbor as the starter for ten
>> >>then
>> >>machine to size and fit bearings. This is hobby use only and then
>> >>occasional. Is there any flaw in this approach?
>>
>> >>Steve
>>
>> >Why do you need to fit bearings to the live centre?
>>
>> >Just put the stub arbour in the headstock. Turn a 60 degree taper on it
>> >and
>> >use it in the headstock without removing it. Instant live centre :-)
>>
>> >Next time you mount it in the headstock, turn another half thou off the
>> >taper
>> >to clean it up and ensure concentricity. Works very well for me once I
>> >discovered that no one seemed to be selling live centres any more.
>>
>> Mark,
>>
>> I may be missing some subtle point here, but there are plenty of live
>> centres around, e.g.
>>
>> http://www.arceurotrade.co.uk/Catalogue/Centres
>>
>> http://www.chronos.ltd.uk/acatalog/Chronos_Catalogue_Lathe_Taper_Tool...
>> _70.html
>>
>> The sets with interchangeable points may be a suitable solution for the
>> OP. Thought about getting one for myself a few times.
>>
>> David
>> --
>> David Littlewood
>
> Yeap, your missing a subtlety. The terminology 'live center' can (and
> I believe 'properly' is)
> indicating the one in the headstock, which turns with the work, as
> opposed to the dead center
> in the tail stock which doesnt.
>
> Dave

What I meant was a centre that rotates in the tailstock - a "running
centre"?

Steve


Posted by Mark Rand on May 24, 2008, 5:55 pm
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wrote:


>What I meant was a centre that rotates in the tailstock - a "running
>centre"?
>
>Steve


Call it a rotating centre and us pedants won't get our oil rags in a twist :-)

The comment about no-one appearing to sell live (soft in this case) centres
any more is true though)


Mark Rand
RTFM

Posted by David Littlewood on May 25, 2008, 6:59 am
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In article
>>
>> I may be missing some subtle point here, but there are plenty of live
>> centres around, e.g.
>>
>> http://www.arceurotrade.co.uk/Catalogue/Centres
>>
>> http://www.chronos.ltd.uk/acatalog/Chronos_Catalogue_Lathe_Taper_Tool...
>> _70.html
>>
>> The sets with interchangeable points may be a suitable solution for the
>> OP. Thought about getting one for myself a few times.
>>
>> David
>> --
>> David Littlewood
>
>Yeap, your missing a subtlety. The terminology 'live center' can (and
>I believe 'properly' is)
>indicating the one in the headstock, which turns with the work, as
>opposed to the dead center
>in the tail stock which doesnt.
>
>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
--
David Littlewood

Posted by Mark Rand on May 25, 2008, 3:55 pm
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On Sun, 25 May 2008 11:59:12 +0100, David Littlewood

>In article

>>
>>Yeap, your missing a subtlety. The terminology 'live center' can (and
>>I believe 'properly' is)
>>indicating the one in the headstock, which turns with the work, as
>>opposed to the dead center
>>in the tail stock which doesnt.
>>
>>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 Rand
RTFM

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