Do I have to remove the handle and insert the graver in the
Crocker, or can I insert it with the handle in place.
No you don’t have to remove the handle, as long as the graver can
extend out far enough.
Also, when sharpening with the Crocker, do I sharpen with the face
of the graver down and the belly of the graver up?
You do all three surfaces actually. The face is usually shaped first
and then the heel is ground and polished one side at a time.
The Crocker style sharpener has been around a long time and can be
used very successfully. I used one for years, long enough that the
round feet are now polished flat. Its main drawback is that it is
almost impossible to re-create the same geometry every time. Its only
adjustment is roll and the markings on the barrel are all but
useless. The length that the graver extends is critical in achieving
the correct relationship of angles, and if it isn’t exactly the same
every time, the entire geometry will be different, even if the same
degree settings are used. Worse, it’s extremely difficult to sharpen
your graver so it doesn’t come out with slightly different angles on
either side, which can make you want to pull your hair out trying to
figure out how come the point keeps slipping or breaking when you
had it so perfect before.
I really recommend that anyone that has an interest in learning any
facet of engraving check out Steve Lindsay’s sharpening system at
www.airgraver.com. The basic design and operation is that of a
three-sided fixed Crocker, much like the home made wooden jigs of
days gone by. It takes all the guesswork out of it and providing you
use a little care in setup, your graver geometry will be identical
every single time. A MAJOR time saver. No test cuts and the resulting
need for tweaking of angles required before returning to the work as
is so common when using a Crocker. It requires no power and is
inexpensive compared to a lot of other options. The main downside is
that you can’t experiment with slightly different geometry, you’re
kind of stuck with each of five or so different shapes. But I haven’t
found any need to change any of them at all. Steve did all of the
experimentation for us. It also only works with 3/32 square gravers
without handles.
The GRS Dual Angle Sharpening Fixture is a vast improvement over the
Crocker style jig. Because of the dual angle adjustments (both roll
and pitch, very much like fixtures used in lapidary faceting work),
the length that the graver extends is unimportant as long as it can
reach the stone without the bottom of the fixture interfering. Face
and heel angles can be repeated with a much higher degree of accuracy
than with a Crocker. Experimentation with different geometries is
easy and it will fit almost any size or shape of graver, with or
without a handle. It is intended for use with the power hone as it
has a magnetic base, but a power hone isn’t required at all. It works
very well with standard stones. It also allows for radiusing flat
bottoms and keeping them ultra-flat at the same time. Almost
impossible to do any other way. No doubt, this is the most adaptable
of all of the sharpening systems available today. But a knowledge of
graver geometry is required or it can be just as frustrating as a
Crocker to figure out. Maybe more so.
A comment on the use of power hones. It has been stated that they
are useless because they grind gravers down to nubs in seconds. That
is absolutely true if the only lap that is used is a 180 grit diamond
lap. But that isn’t the only grit available by a long shot. It’s kind
of like stating that a powered polishing lathe should never be used
because it polishes all of the detail and years of wear off of
jewelry in seconds. Which is also true if it is only ever used with 8
inch ultra-hard treated wheels and crocus compound.
When a power hone is used with a ceramic lap charged with 50,000
mesh (1/2 micron) diamond, it polishes a graver exceptionally well
while removing virtually no material. In fact, it can be agonizingly
slow when used with the finest grit sprays. There are several
different grits of diamond impregnated wheels, ranging from around
160 to 2000 grit. Lapidary laps can also be used, giving us even more
options. Then there are the ceramic laps which are charged with one
of several different grits of diamond, usually applied with a
sprayer, which are used for final polishing. That said, I use mine
mainly for bulk removal and basic shaping, a lot of which is done on
tools other than gravers. Pretty handy little device if you like
grinding your own tools without having the worry of over-heating
them.
I do most all of my graver sharpening with the Lindsay system, with
the exception of flat bottoms on which I prefer a radiused heel. You
can’t do a radiused heel with the Lindsay jigs or a Crocker. But with
a dual angle fixture, a power hone and ceramic lap, it’s a high
polished piece of cake two minute job. A dream come true if bright
cutting is your thing.
Dave Phelps