Grinding Nirvana
Can
one get excited about a grinder? Well, not really ... I'd say that
you need to get a life. However ...
I like to keep things
simple, although my set up looks anything but that
It
has, in fact, just got simpler ... and better ... and easier ... and
I am excited that sharpening will take less effort than ever (yes, I
do have to get a life).
I have been using a Tormek for hollow
grinding for almost two years. It is really excellent for grinding
safely to the very edge of the bevel. I also have an 8" half
speed dry grinder. This is used for plane and chisel blades as well,
especially for those requiring the removal of a fair amount of steel
or where the steel is harder than ideal for the Tormek (e.g. HSS,
D2).
My plan has been to develop the dry grinder for my lathe
chisels. I had been looking into buying the solid Wolverine Grinding
Tool Rest to replace the LV tool rest. I liked the idea that it
interchanged a tool rest for bench chisels and plane blades with a
rest for lathe chisels. I have been freehanding all my lathe chisels
to date, but I realise that, while this is fine for spindle work, I
will need to improve the accuracy of complex grinds as I begin to do
more bowls.
The Wolverine is not available in Australia, and
so I had begun to look at alternatives. The one that caught my eye
was a recent product from Tormek. No, not another wet grinder ... but
a tool rest for a dry grinder, the Bench
Grinder Mounting Set BGM-100
.
This is not really a new product, but a packaging of the
universal support and adjustable mount. It comes with a manual for
setting up and use.
So this is this one I bought, and have
just set up, and used. There it is ...
The
grinder is set up with a blue Norton 46 grit 3X wheel and a white
Norton 46 grit wheel.
Note that I actually have just the
single universal support (the tool rest) for the grinder. The second
one here is borrowed from the Tormek. I do have two mounts so that a
support can be swapped from one side to the other.
There are
also two types of tool jigs: the chisel/plane blade holder and a flat
rest. I do not, as yet, have any for lathe chisels.
The
chisel/plane blade holder is terrific for grinding a perfect hollow,
while the flat rest allows for freehanding a hollow or grinding a
skew (or any other custom need).
What is great is that one
can move between the machines (Tormek and grinder). This is
facilitated by the ability to set the grinding angle exactly when
using the AngleMaster:
Here
is a chisel I re-ground from scratch. It took about 1 minute or less
to set up the angle to 25 degrees and a couple of minutes to grind
fully..
A
few swipes on my waterstones ..
I
also ground the camber for a D2 jack plane blade. To do this I used
the flat rest ..
After
honing ..
What
I like about this set up is that it is so easy to obtain a repeatable
angle, as easy as to grind a clean camber, and the promise of great
flexibility and range in grinding all types of blades.
For
interest, here is my sharpening centre (still has doors to go on the
sink cabinet ..
...
and Shapton waterstones used (1000/5000/12000) ...
Regards
from Perth
Derek
September 2009