Subject: Re: Bench Grinder Tool Rests

From: Roy Robinson <[email-masked]>
Date: Thu, 05 Dec 1996 18:20:52 -0700

Chris Kantarjiev wrote:
> 
>         There is an article in one of the Village publishing books
>         on making such a holder.  Its a copy of the one sold by
>         South Bend which I got from my dad.
> 
> I've always admired that little holder in the South Bend publications,
> and would love to find one. Failing that, I'd love to get a more
> accurate reference to which "one of the Village publishing books"
> describes how to make one...
 I think you may be talking about "A Rocking, Swinging Grinder Table"
(great title).  It's in MetalWorking-Book 1, Projects in Metal.  Page
144, written by Harold Mason.  I built it and it works great. I found it
has a tendency to overheat the cutter - it's more difficult to "feel" if
you are trying to remove to much at a pass, it would be great with some
coolant spraying at the grind edge.

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From: [email-masked] (Fitch R. Williams)
Date: Sat, 07 Dec 1996 22:18:12 GMT

>coolant spraying at the grind edge.

Well, that could be what he was writing about, I've looked
at it - have to book.  Its a nice one of its kind, no doubt.

What I thought chris was reffereing to is the holder my Dad
bought from SB for grinding tools.  Basically it is a set of
round piece of metal with a square hole to hold a particular
size bit in one end, and a flange with degrees stamped on
them on the other end.  this holder fits into a square metal
block with both a flat botton on the front section, and a
slanted botton for front currer relief on the after section.
It holds the bit with a set screw and can be locked at a
particular degree setting with another.  

Using this holder, one only needs a flat grinder table in
front of the corse and fine wheels to do a first class job
of grinding HSS cutter bits.  the repeatability of using the
holder beans the bit can be easily resa\harpened with oub
creating a multifaceted face.  Because the pressure is all
applied you retain total "feel" for what is going on with
the cutter.  As a result, I havn't "blued" the edge of one
since I started using it.  The cutters are easier to hone
with a tiny "microbevel" like I always use on wood chisels
with with nice flat faces also, so I end up doing less
grinding.  I don
't need to regrind until the microbevel grows in width to
060" - .080".  So I do four to five honings between touch
ups on the grinder.

When grinding in a new piece of tool bit I often push an ice
cube up against the intersection of the tool bit and the
grinding wheel to help cool it and speed up the process.
I've done that for years with wood chisels.  It is a tad
messy, but works well if one doesn't get carried away and
put to much pressure on the bit.  It woeks better on wood
chisels because their thin cross section gives better heat
transfer, but it is better than grinding for 30 seconds and
cooling for 30 seconds in ice water on tool bits.

Fitch

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From: [email-masked] (Peter Brooks)
Date: 6 Dec 1996 18:36:16 GMT

Fitch R. Williams ([email-masked]) wrote:
: [email-masked] (Chris Kantarjiev) wrote:

: >I've always admired that little holder in the South Bend publications,
: >and would love to find one. Failing that, I'd love to get a more
: >accurate reference to which "one of the Village publishing books"
: >describes how to make one...

: It must be in one of their magazines  - I went through all
: my books and it isn't in there.  There are some I don't

Hmm, I guess I missed the SB tool holder in the 'how to ruin a lathe'
book.  I'll dig out one of my copies (got the 1965 edition by accident,
thinking I was ordering the Sheldon book) and see if it rings any
bells.

Still, on tool grinder rests, Mason (I think) did one in the PIM 1 book
under _A rocking, swinging tool rest_.  It wants a side-cutting wheel,
but otherwise it would work with a standard grinder.  It's pretty high
on my to-do list.

BTW, between PIM's Metalworking 1 and 2 books, there is no shortage of
grinders, grinding fixtures, and tool and cutter grinders.  There's a
rather elegant version in, er, book 2 (I think) that takes the Phil
Duclos air spindle end mill grinding fixture and integrates it into a
full-bore T&C grinder.  Nice lathe toolbit fixturing, too.

Pete Brooks

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From: [email-masked]
Date: 7 Dec 1996 20:19:00 GMT

In article <[email-masked]>, Roy Robinson
<[email-masked]> writes:

>> and would love to find one.

These may still be available new. The set is SBL's #CE2168. They are shown
on page 27 of my Blue Ridge Machinery & Tools catalogue #22 (rec'd April
1996). Their South Bend prices are "on request".

7 December 1996

David Lindquist
[email-masked]