Tangential/Diamond tool holders.

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Tangential/Diamond tool holders. Youra 05-29-2008
Posted by the wizard on May 29, 2008, 7:40 am
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> Hi all.
>
> Stumbled across these as the result of another thread on turning tools
> generally - for example this sort of thing:
>
> http://www.gadgetbuilder.com/ToolHolders.html#Tangent
> =A0 =A0 and (commercial site)http://www.eccentricengineering.com.au/
>
> To me, these seem like rather a good idea - in particular sharpening
> HSS bits for general purpose turning becomes a breeze (in theory at
> least) but lack of general adoption makes me think that there's
> something I've missed. One thing that comes to mind is unless you have
> a couple of sharpening, getting anything other than a single angle of
> top-rake is difficult.
>
> Are there any opinions from the group?
>
> Thanks,
>
> Youra.

Hi youra,
I take it you did not see one demonstrated at last years Model
Engineering Exhibition at Ascot. They had one on the SMEE stand, They
seem to take off either dust or 4mm or any where in between, on mild
steel using a Myford.. Beauty seems to be they are SO simple to
sharpen, and easily adjusted to centre hieght, no more packing stips.
Having seen one I was interested and made one, then did some research,
they are certainly not new, earliest reference I could find was 1885.
They are also used in old style roller boxes.
Make one and be a convert.
T.W.

Posted by mark@ems-fife.co.uk on May 29, 2008, 7:51 am
Please log in for more thread options
> Hi all.
>
> Stumbled across these as the result of another thread on turning tools
> generally - for example this sort of thing:
>
> http://www.gadgetbuilder.com/ToolHolders.html#Tangent
> and (commercial site)http://www.eccentricengineering.com.au/
>
> To me, these seem like rather a good idea - in particular sharpening
> HSS bits for general purpose turning becomes a breeze (in theory at
> least) but lack of general adoption makes me think that there's
> something I've missed. One thing that comes to mind is unless you have
> a couple of sharpening, getting anything other than a single angle of
> top-rake is difficult.
>
> Are there any opinions from the group?
>
> Thanks,
>
> Youra.

Old technology but works extremely well.Very common on Multispindle
lathes,capstans and turrets.Inserted tip tools of this type were also
available as was brazed tips.
The process is called tangential turning.


Posted by mark@ems-fife.co.uk on May 29, 2008, 7:55 am
Please log in for more thread options
>
>
>
> > Hi all.
>
> > Stumbled across these as the result of another thread on turning tools
> > generally - for example this sort of thing:
>
> >http://www.gadgetbuilder.com/ToolHolders.html#Tangent
> > and (commercial site)http://www.eccentricengineering.com.au/
>
> > To me, these seem like rather a good idea - in particular sharpening
> > HSS bits for general purpose turning becomes a breeze (in theory at
> > least) but lack of general adoption makes me think that there's
> > something I've missed. One thing that comes to mind is unless you have
> > a couple of sharpening, getting anything other than a single angle of
> > top-rake is difficult.
>
> > Are there any opinions from the group?
>
> > Thanks,
>
> > Youra.
>
> Old technology but works extremely well.Very common on Multispindle
> lathes,capstans and turrets.Inserted tip tools of this type were also
> available as was brazed tips.
> The process is called tangential turning.

Here`s a link to a months worth of reading.
http://www.google.co.uk/search?hl=en&q=%22tangential+turning+tools%22&btnG=Google+Search&meta=


Posted by Trevor Jones on May 29, 2008, 8:58 am
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Youra wrote:

> Hi all.
>
> Stumbled across these as the result of another thread on turning tools
> generally - for example this sort of thing:
>
> http://www.gadgetbuilder.com/ToolHolders.html#Tangent
> and (commercial site)
> http://www.eccentricengineering.com.au/
>
> To me, these seem like rather a good idea - in particular sharpening
> HSS bits for general purpose turning becomes a breeze (in theory at
> least) but lack of general adoption makes me think that there's
> something I've missed. One thing that comes to mind is unless you have
> a couple of sharpening, getting anything other than a single angle of
> top-rake is difficult.
>
> Are there any opinions from the group?
>
> Thanks,
>
> Youra.

I looked at the "Diamond" toolholder in a magazine article or advert,
and decided I wanted one, but not enough to spend over $100 for it, so I
made one.

Mine fits the category of "crude but very effective". I built it
entirely on the Myford lathe on which it was to be used, to see if I
could. It works very well.

I did not bother trying to get it exactly as shown in the advert, but
just built it in a way that the tool could cut into a corner, so that I
could both turn and face at a single setting.

I use it a lot.

Cheers
Trevor Jones


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