Subject: Re: "Diamond" toolholder?

From: [email-masked] (Joe Landau)
Date: Fri, 14 Jun 96 06:06:33 GMT

In article <[email-masked]>,
   [email-masked](Wm. Congreve (Sr.) ) wrote:
>                    
>(Posting for John Haddy, who seems to be receiving this newsgroup but
>is temporarily unable to post to it): Any opinions and comments on the
>Diamond Toolholder, a tangential tool bit holder for lathes? I gather
>from the ad that only a single face needs to be ground on the bit, with
>the toolholder itself holding the bit so that all reliefs are ok.  Am I
>correct in assuming that the support of the bit assures that there is
>more mechanical strength and less chatter?  (I would be using it on a
>Myford 7).
>
I read the articles in HSM about the tangential etc., but I didn't understand 
it.  Seems to me that from the point of view of the work, the cutting edge 
looks just like that of a standard bit.  The neat way of grinding on the 
end would economize on bits, but it would take quite a few bits to come out 
even against nearly $100 for the toolholder.

incidentally, there was an article once (in ME?) about "tangential cutting of 
tapers" that featured a cutting tool like a knife blade, set with the long 
axis parallel to the lathe axis, but at an angle to the horizontal, so that it 
contacted the work at only one point.  tangential like peeling an apple.  

--
Joseph R. Landau                                 [email-masked]
Applied Software Technology                          (408)370-2662
591 W. Hamilton Ave., #201
Campbell, CA 95008  USA                             Even Jove Nods

---

From: PPIERCE <[email-masked]>
Date: Thu, 13 Jun 1996 09:58:12 -0700

> more mechanical strength and less chatter?  (I would be using it on a

Two writeups on the Diamond Toolholder in latest HSM.

Interesting...

Paul in AJ AZ

---

From: [email-masked](Wm. Congreve (Sr.) )
Date: 13 Jun 1996 12:02:49 GMT

---

From: [email-masked] (Lughaid)
Date: 16 Jun 1996 22:37:52 -0400

In article <[email-masked]>, [email-masked](Wm.

>more mechanical strength and less chatter?  (I would be using it on a

That seems to be correct, according to articles in the May/June 1996 Home
Shop Machinist.  According to the tool's designer, however, the holder
_is_ designed to slip the bit in case of a catch, rather than hogging in.

---

From: [email-masked] (Roger Lainson)
Date: Fri, 14 Jun 1996 06:24:33 GMT

> more mechanical strength and less chatter?  (I would be using it on a

I use mine almost all the time (except for parting off and infrequent LH
facing) mostly because it's really easy to whip out, sharpen and set back
at centre height. I'm lousy at offhand grinding so with other tools I
always grind off heaps too much trying to get the edge at the right angle,
or something. 

The Diamond comes with a neat little jig to hold it on the grinding rest
at the correct angle; really easy. It's also convenient to have a single
length of HSS with both ends sharpened but with different corner radii.
Provided you get the holder size appropriate for your lathe, it's also
very rigid.

The same people also make a conventional but neat parting tool holder. 
I've no connection with the manufacturer - just a very satisfied user!

Roger Lainson.

-------------------------SDR Clinical Technology------------------------
          213 Eastern Valley Way, Middle Cove, NSW 2068, Australia
Voice: +61-2-9958-2688     Fax: +61-2-9958-2655    email: [email-masked]
           World Wide Web: http://www.sdr.com.au/sdr/index.html
------------------------------------------------------------------------