[modeleng] Re: How do these work please?

Only a rather small hole is required to tighten the screw so they work well
in an almost blind hole. A bolt and nut based mandrel using a very small
bolt would not be nearly as rigid as these expanding mandrels.

> -----Original Message-----
> From: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx]
> On Behalf Of Tony Wells
> Sent: Sunday, April 22, 2007 12:18 PM
> To: modeleng@xxxxxxxxxxxxx
> Subject: [modeleng] Re: How do these work please?
> 
> Thanks Ken, and Peter of course. What puzzled me is that while it looks a
> bit like a pin chuck, to grip inside a hole, it would only be of use with
> a
> through hole, for access to the set screw adjuster, where a nut and bolt
> might be just as easy.
> 
> Tony.
> ----- Original Message -----
> From: "Ken Strauss" <ken.strauss@xxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Sunday, April 22, 2007 3:16 PM
> Subject: [modeleng] Re: How do these work please?
> 
> 
> > They're very simple. Just a cylinder of steel (?) that has six slits
> along
> > the axis to make fingers. A central hole is drilled and tapped.
> Inserting
> > a
> > flat-head screw expands the fingers. It is easier to see the design if
> you
> > click on "View larger picture" on the eBay listing that you referenced.
> >
> 
> 
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