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Posted by Ian Phillips on March 30, 2008, 3:14 pm
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> Ian wrote:
>> ... snip
>>
>> I have thought of making an expanding mandrel which is somehow activated
>> through the headstock spindle but it seems overcomplicated
>>
>>
>> Thanks in advance for any suggestions
>>
>> Ian Phillips
>>
>>
>> ... snip
>
> Here's a really simple design for an expanding mandrel.
> You will need a suitably sized socket head cap screw and a nice long
> socket key - one that will reach the mandrel from the outside end of the
> headstock spindle. A piece of hex-rod and a spanner would do the job. A
> 1st-taper tap and tapping drill to match the screw.
> Make the mandrel out of any suitable material you have, slightly oversize,
> and drill a hole right through with the tapping drill. Tap a thread from
> the headstock end of the mandrel until the end of the tap protrudes a
> little from the mandrel - this ensures that the thread is not cut to full
> depth at the end.
> Make two axial saw cuts in the end of the mandrel, at right angles to each
> other Insert the screw finger tight, put the mandrel in the lathe chuck
> and skim it to final size, and the job is essentially finished.
> The following link should make it all clear.
> http://tinyurl.com/2lf2tq
> Put the workpiece on the mandrel and tighten the screw from within the
> lathe spindle, which will expand the mandrel because of the tapered thread
> and grip the workpiece securely.
>
> You could, of course, use a long threaded bar instead of a socket screw
> and long key.
>
> --
> Regards, Gary Wooding
> (To reply by email, change feet to foot in my address)
>
Thats exactly along the lines I was thinking but your implementation is far
simpler and easier to make than I was contemplating, its probably what I
will do.
Thanks
Ian
>
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