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Posted by David Billington on May 1, 2008, 6:34 pm
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dragonbreed@comcast.net wrote:
> Hello. Looking for a round device that one end can acccurately grip
> (via expanding fingers?) a 1/2" round ID of a steel "puck", so the
> whole outer surface of the puck can be sanded/polished. The other end
> I can chuck into a lathe. Is there anything off-the-shelf available ?
>
> Thank you.
> Marcel
>
I've done this a few times and have just made my own mandrel. Chuck some
material, machine a spigot to locate the part and face a shoulder for
the part to go against, tap for a suitable countersunk screw, then make
two slits at 90 degrees to allow the countersunk screw to expand it.
Easy to do on a lathe and bandsaw or hacksaw. If more info required I
can post a picture tomorow.
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Posted by Randy on May 2, 2008, 10:14 am
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On Thu, 01 May 2008 23:34:06 +0100, David Billington
>dragonbreed@comcast.net wrote:
>> Hello. Looking for a round device that one end can acccurately grip
>> (via expanding fingers?) a 1/2" round ID of a steel "puck", so the
>> whole outer surface of the puck can be sanded/polished. The other end
>> I can chuck into a lathe. Is there anything off-the-shelf available ?
>>
>> Thank you.
>> Marcel
>>
>I've done this a few times and have just made my own mandrel. Chuck some
>material, machine a spigot to locate the part and face a shoulder for
>the part to go against, tap for a suitable countersunk screw, then make
>two slits at 90 degrees to allow the countersunk screw to expand it.
>Easy to do on a lathe and bandsaw or hacksaw. If more info required I
>can post a picture tomorow.
Nice idea for a small mandrels, I've always done the same technique
using a pipe plug. (npt)
Thank You,
Randy
Remove 333 from email address to reply.
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Posted by Ned Simmons on May 1, 2008, 7:15 pm
Please log in for more thread options On Thu, 1 May 2008 14:26:02 -0700 (PDT), "dragonbreed@comcast.net"
>Hello. Looking for a round device that one end can acccurately grip
>(via expanding fingers?) a 1/2" round ID of a steel "puck", so the
>whole outer surface of the puck can be sanded/polished. The other end
>I can chuck into a lathe. Is there anything off-the-shelf available ?
http://www.dunhamtool.com/expanding_collet.html
--
Ned Simmons
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Posted by Jim Wilkins on May 2, 2008, 8:02 am
Please log in for more thread options wrote:
> Hello. Looking for a round device that one end can acccurately grip
> (via expanding fingers?) a 1/2" round ID of a steel "puck", so the
> whole outer surface of the puck can be sanded/polished. The other end
> I can chuck into a lathe. Is there anything off-the-shelf available ?
>
> Thank you.
> Marcel
This chuck will expand in a blind hole:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3D4486
As delivered the jaw OD is about 0.59" but on mine they are soft
enough to file so you should be able to turn them down to fit your
part. The arbor mounting thread is M12-1.0.
Jim Wilkins
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Posted by Jim Sehr on May 2, 2008, 10:42 pm
Please log in for more thread options google Rovi collets
> Hello. Looking for a round device that one end can acccurately grip
> (via expanding fingers?) a 1/2" round ID of a steel "puck", so the
> whole outer surface of the puck can be sanded/polished. The other end
> I can chuck into a lathe. Is there anything off-the-shelf available ?
>
> Thank you.
> Marcel
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> (via expanding fingers?) a 1/2" round ID of a steel "puck", so the
> whole outer surface of the puck can be sanded/polished. The other end
> I can chuck into a lathe. Is there anything off-the-shelf available ?
>
> Thank you.
> Marcel
>