Triple Diamond™ by Mercer
Instruction MANUAL
Triple Diamond™ by Mercer
Three-Stage Knife Sharpener
Read these instructions before use.
It is essential that you follow these
instructions to achieve optimum results.
When using electrical appliances, basic safety precautions should always be
followed including the following:
1. Read all instructions.
2. To protect against electrical hazards, do not immerse the Triple Diamond™ by
Mercer Knife Sharpener in water or other liquid.
3. Make sure only clean knife blades are inserted in the Triple Diamond™ by Mercer
Knife Sharpener.
4. Unplug from outlet when not in use, before putting on or taking off parts and
before cleaning.
5. Avoid contacting moving parts.
6. Do not operate any appliance with a damaged cord or plug or after the appliance
malfunctions, or is dropped or damaged in any manner.
U.S. customers: You may return your sharpener to Mercer for service where the cost of repair or electrical or mechanical adjustment can be estimated. When the electrical cord
on this appliance is damaged, it must be replaced by Mercer or other qualified service
to avoid the danger of electrical shock.
Outside U.S.: Please return your sharpener to your local distributor where the cost of repair
or electrical or mechanical adjustment can be estimated. If the supply cord of this appliance is damaged, it must be replaced by a repair facility appointed by the manufacturer
because special tools are required. Please consult your Mercer distributor.
7. CAUTION! This appliance may be fitted with a polarized plug (one blade is wider than
the other). To reduce the risk of electric shock, this plug will fit in a polarized outlet
only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does
not fit, contact a qualified electrician. Do not modify the plug in any way.
8. The use of attachments not recommended or sold by Mercer may cause fire, electric
shock or injury.
9. The Triple Diamond™ by Mercer Knife Sharpener is designed to sharpen kitchen
knives, pocket knives and most sports knives. Do not attempt to sharpen scissors, ax
blades or any blade that does not fit freely in the slots.
10.Do not let the cord hang over edge of table or counter or touch hot surfaces.
11.When in the “ON” position (Red flash on switch is exposed when “on”) the Triple Diamond™ by Mercer Knife Sharpener should always be on a stable countertop or table.
13.Do not use outdoors.
14.Close supervision is necessary when any appliance is used by or near children.
15.Do not use honing oils, water or any other lubricant with the Triple Diamond™ by
Mercer Knife Sharpener.
You Made
a Good
rofessional chefs and serious cooks rely on the Triple Diamond™ by Mercer Knife
Sharpener to maintain the high performance edges on their favorite knives.
With your Triple Diamond™ by Mercer Knife Sharpener you will share the same
professional advantage with knives of astonishing sharpness and durability. The
Triple Diamond™ by Mercer Knife Sharpener incorporates the latest sharpening
technology, to create advanced performance edges on all your fine-edge and serrated knives.
You will find the Triple Diamond™ by Mercer extremely fast, simple and safe to use
on all quality knives. Please read this instruction booklet thoroughly before using
the sharpener to optimize your sharpening results.
Chefs acknowledge the value of a fine cutting edge for elegant food preparation.
As an owner of the Triple Diamond™ by Mercer you have the means to create
edges of perfection, sharpness and durability previously unobtainable with even
the world’s most expensive commercial sharpening systems. You will find it is a joy
to sharpen and use your knives but also remember, the edge is incredibly sharp!
The Triple Diamond™ by Mercer creates demonstrably superior multifacet edges
on knives of any steel – carbon, stainless or alloy of any hardness. Edges
sharpened on the Triple Diamond™ by Mercer are much sharper and stay sharp
longer than conventional and hollow ground edges.
You can easily and very quickly sharpen the entire cutting edge of your favorite
knives, from the tip to the handle or bolster. The highly precise edges will reward
you with years of superior knife performance.
Getting to know the TRIPLE DIAMOND™ by mercer
The unique Triple Diamond™ by Mercer is designed to sharpen each knife according to your
intended use, whether it is gourmet food preparation, butchering, dressing of game or filleting of
fish. You can sharpen knives with either straight or serrated edges. This three (3) stage sharpener has two precision conical sharpening/honing stages with fine 100% diamond abrasives
and one polishing/stropping stage using flexible abrasive disks. These stages can be used in
different sequences to give you either an astonishingly sharp, smooth faceted edge for effortless
cutting and presentations or one with a selected amount of residual “bite” along the facets. The
edge is ultra sharp and non-serrated. This residual “bite” is created by precisely polished micro
flutes that are formed on the facet surface by the ultra honing action of the stropping disks in
Stage 3. You will find that these sharp flutes on each side of the ultra sharp and non-serrated
cutting edge aid substantially in those difficult cutting chores experienced with fibrous foods,
meats, stalky vegetables, dressing of game or household chores such as cutting cardboard,
leather, carpet, etc.
The sharpening and honing/polishing actions are controlled by using precision angle guides for
the blade and precisely matched conically shaped abrasive disks. The sharpening angles are
several degrees larger in each successive stage.
Fine diamond-coated conical disks in Stage 1 create microgrooves along the facets on each
side of the edge, establishing the first angled bevel of the edge.
In Stage 2, finer microgrooves are created across the facets immediately adjacent to the edge
by still finer diamonds as they establish a well defined second bevel on the facets that is a few
degrees larger than the bevel developed in Stage 1.
In Stage 3, ultra fine abrasive disks are set at a third and slightly larger angle. They polish and
strop the facets immediately adjacent to the edge creating a third micro bevel and establish a
microscopically thin, straight and super polished edge of astonishing sharpness. The stropping
action simultaneously polishes and sharpens the boundaries of those microgrooves created by
the diamond abrasives in Stages 1 and 2 adjacent to the edge until they become sharp micro
flutes that will assist the cutting action of “difficult to cut” materials.
This unique three stage design gives you an edge of remarkable sharpness and, because of the
triple angle bevel it creates on each facet, you will note knives stay sharp much longer.
The following sections describe the general procedures for optimal sharpening in each stage
and then suggest how you can optimize the edge for your intended uses.
Unless you do a lot of heavy duty cutting, you will need to use Stage 1 only infrequently. One of
the important advantages of using the Triple Diamond™ by Mercer is that you can strop and
polish your knives to razor sharp edges as often as needed and yet experience little knife wear
compared to older sharpening methods. Resharpening can usually be done in Stage 3. Use
Stage 2 less often for resharpening and use Stage 1 only for the heaviest duty applications.
(See Resharpening Section).
The Triple Diamond™ by Mercer is equipped with a manually activated diamond dressing pad
that can be used if necessary to clean any accumulated food or sharpening debris off the surface of the polishing/stropping disks. We strongly urge you to clean your knives before sharpening them. You will find you can go months or even a year or more before you need to dress these
disks. Only if you sense a distinct decrease in polishing efficiency will there by any need to use
this convenient feature described further in a subsequent section.
Each sharpening stage is equipped with elastomeric guide springs positioned over the sharpening disks to provide a spring action that holds the face of your knife securely against precision
guide planes in the right and left slots of that stage during sharpening.
Unless you have special blades designed to be sharpened primarily on one side of the edge
(such as Japanese Kataba blades) you will want to sharpen equally in the right and left slots of
each stage you use. This will ensure that the facets on each side of the edge are of equal size
and that the edge will cut straight at all times.
When sharpening in any stage the knife should, on sequential strokes, be pulled alternately
through the left slot and the right slot of that stage. Generally only one pull in the left and one
in the right slot will be adequate in each stage; occasionally you may need to make two pairs of
pulls in a given stage (see subsequent sections for more detail). Always operate the sharpener
from the front side. Hold the blade horizontal and level, slide it down between the plastic spring
and the guide plane and pull it toward you at a uniform rate as it contacts the sharpening or
stropping disks. You will be able to feel and hear the contact as it is made. Always keep the blade
moving uniformly through each stage; do not stop your pull in mid stroke. Consistent pull speed
of about 4 seconds per stroke for an eight (8) inch blade is recommended. The time can be less
for shorter blades and more for longer blades.
Never operate the sharpener from the back side.
Use just enough downward pressure when sharpening to ensure uniform and consistent contact
of the blade with the abrasive disks on each stroke. Additional pressure is unnecessary and will
not speed the sharpening process. Avoid cutting into the plastic enclosure. Accidental cutting
into the enclosure will not functionally impact operations of the sharpener or damage the edge.
Figure 1 (below) identifies each of the three stages as described further in the following sections.
Stage 2
Stage 1
Stage 3
Figure 1. Mercer Knife Sharpener.
Figure 2. Typical Mercer knife.
Read This Before You Start to Sharpen
The Triple Diamond™ by Mercer is designed to sharpen either Straight edge or Serrated edge
1. Sharpen Serrated Edge Blades only in Stage 3. Do not sharpen serrated blades in
Stages 1 and 2, as that will unnecessarily remove more metal from the serrations. See
Section titled Procedure for Sharpening Serrated Blades for more details.
2. Straight Edge Blades can be sharpened in all three stages, however, use of Stage 1 may
be necessary only if the knife is very dull or if you wish to create an edge with extra “bite”.
See following Section for more details.
Procedure for Sharpening Straight Edge Blades
Straight Edge Blades: Sharpening First Time
Before you turn on the power, remove the cover positioned over Stage 1 and slip a knife blade
smoothly into the slot between the left angle guide of Stage 1 and the elastomeric spring.
Do not twist the knife. (See Figure 3.) (Retain the Stage 1 cover as a ready reminder of the
sharpening steps.)
Move the blade down in the slot until you feel it contact the diamond disk. Pull it towards you,
lifting the handle slightly as you approach the tip. This will give you a feel for the spring tension.
Remove the knife and press the Power Switch. A red “indicator” on the switch appears when this
switch is turned “ON.”
Stage 1: (If your knife is already reasonably sharp, skip Stage 1 and go directly to Stage 2.) If you
are sharpening a knife for the first time or if the knife is very dull, start in Stage 1. Pull the knife
once through the left slot of Stage 1 (Figure 3) by slipping the blade between the left angle guide
and the polymeric spring while pulling the blade toward you and simultaneously moving the blade
downward in the slot until it engages the diamond coated disk. You will hear it make contact with
the disk. Insert the blade as close as possible to its bolster or handle. If the blade is curved, lift
the handle slightly as you sharpen near the tip of the knife, keeping the blade edge approximately
parallel to the table. Sharpen the entire blade length. For an eight (8) inch blade, each pull should
take about 4 seconds. Pull shorter blades through in 2-3 seconds and longer blades in 6 seconds.
Next, repeat with one full length pull in the right slot of Stage 1.
Note: Each time you insert the blade you should simultaneously pull the blade toward you. Never
push the blade away from you. Apply just enough downward pressure to make contact with the
wheel - added pressure does not modify or speed the sharpening process.
Figure 3. Stage 1. Inserting blade in slot between guide
and elastomeric spring. Alternate left and right slots.
To ensure even sharpening along the entire blade length, insert the blade near its bolster or handle
and pull it at a steady rate until it exits the slot. In each stage, make an equal number of pulls
alternating in the left and right slots in order to keep the edge facets symmetrical. Generally
in Stage 1 you will find only two (2) pair of pulls, alternating in each (left and right) slot is adequate.
Then proceed to Stage 2.
Stage 2: Using the above procedure described for Stage 1, sharpen the blade in Stage 2.
Pull the blade once through the left slot of Stage 2 (Figure 4) and once through the right slot (Figure
5). For an eight (8) inch blade, take about four (4) seconds for each pull. For longer knives, take
about 6 seconds per pull and about 2-3 seconds for shorter blades.
Before moving to Stage 3, it is very important to confirm that a burr (Figure 6) exists along one
side of the edge. To check for the burr, move your forefinger carefully across the edge as shown
in the Figure 7 (below).
(Do not move your finger along the edge - to avoid cutting your finger). If the last pull was in the
right slot, the burr will appear only on the right side of the blade (as you hold it) and vice versa. The
burr, when present, feels like a rough and bent extension of the edge; the opposite side of the edge
feels very smooth by comparison. If a burr exists, proceed to Stage 3.
If no burr exists, make additional pulls in the left and right slots of Stage 2 before proceeding
to Stage 3. Slower pulls will help develop the burr. Confirm the presence of the burr and only
Figure 4. Inserting blade in left slot of Stage 2.
Figure 5. Inserting blade in right slot of Stage 2.
Move fingers
across and
away from
Figure 6. Develop a distinct burr along knife edge before
stropping in Stage 3.
Figure 7. Burr can be detected by sliding fingers across
and away from the edge. Caution! See text.
then proceed to Stage 3. (Incidentally, you may find it helpful whenever sharpening in Stage 1
to check for the burr formed there as an indication that sharpening in that Stage is complete.
It is not essential to develop a burr in Stage 1 unless, as discussed later, you intend to bypass
Stage 2 and go directly to Stage 3. It is always important to have a burr on the edge before
stropping in Stage 3.)
If the knife is extremely dull, additional pulls in Stage 2 may be needed or, alternately, make one
pair of pulls in Stage 1, then repeat in Stage 2 before proceeding to Stage 3.
Stage 3: In general only one (1) or two (2) pairs of pulls in Stage 3 will be necessary to obtain a
razor sharp edge. As in Stages 1 and 2, make alternate pulls in left (Figure 8) and right slots, pulling
the knife through the slots at the same speed used in Stages 1 and 2.
More pairs of pulls in Stage 3 will refine the edge further, creating an edge particularly desirable
for gourmet preparations. Fewer pulls in Stage 3 may be preferable if you will be cutting fibrous
foods as discussed in more detail in the following sections.
Optimizing the Knife Edge for Each Use
Gourmet Food Preparation:
Where the finest and smoothest cuts are preferred in order to prepare smooth unmarked
sections of fruits or vegetables, sharpen in Stage 2 (or 1 & 2 as described above) and make extra
pulls through Stage 3. Three (3) or more pairs of pulls with each pull alternating in the left and right
slots of Stage 3 will refine the third facet and create remarkably smooth and sharp edges, (Figure
9) ideal for the gourmet chef.
When resharpening the Gourmet edge, use Stage 3 each time (alternating left and right slots). If,
after a number of resharpenings, it is taking too long to resharpen, you can speed the process
by resharpening first in Stage 2, following the procedures detailed, and then resharpen in Stage
3. By this means, you will retain very smooth edges and prolong the life of your knives. This
procedure, unlike conventional sharpening, will give you extraordinarily sharp knives every day
while removing very little metal.
For Meats, Field Dressing and Highly Fibrous Material:
For butchering, field dressing or cutting fibrous materials, you may find it advantageous to sharpen
in Stage 1 - followed directly by Stage 3. This will leave sharpened micro flutes along the facets
Figure 8. Inserting blade only in left slot of Stage 3.
Alternate left and right slots.
near each side of the edge (Figure 10) that will assist in the cutting of such materials. The edge will
be very sharp and unserrated after only one or two alternating pairs of pulls in Stage 3.
To prepare this type of edge, sharpen in Stage 1 until a burr is developed along the edge. Then
move directly to Stage 3 and make one or two pairs of pulls there.
To preserve this type of edge, when the knife needs resharpening, use Stage 3 for only one or two
resharpenings. Then go back to Stage 1 for one (1) pull in each of the left and right slots and return
directly to Stage 3. Do not over sharpen in Stage 1.
For Game and Fish:
The optimum edge for cooked poultry generally can be obtained by using Stage 2 followed by
Stage 3. (Figure 11) For raw poultry, Stage 1 followed by Stage 3, as described above, may be
preferable. For filleting fish, use a thin but sturdy blade sharpened in Stages 2 and 3.
Procedure for Sharpening Serrated Blades:
Serrated blades are similar to saw blades with scalloped depressions and a series of pointed teeth.
In normal use the pointed teeth do most of the cutting.
Serrated blades of all types can be sharpened in the Triple Diamond™ by Mercer Knife Sharpener.
However, use only Stage 3 (Figure 12), which will sharpen the teeth of the serrations and develop
micro blades along the edge of these teeth. Generally five (5) to ten (10) pairs of alternating pulls in
Stage 3 will be adequate. If the knife is very dull, more pulls will be needed. If the knife edge has
been severely damaged through use, make one fast pull (2-3 seconds for an 8” blade) in each of
Figure 9. A larger polished facet
adjacent to edge is ideal for
gourmet preparations.
Figure 10. Retention of larger
microflutes adjacent to edge helps
when cutting fiberous foods.
Figure 11. For fish and poultry
retention of finer microflutes
adjacent to edge can be helpful.
Figure 12. Sharpen serrated blades only in Stage 3.
(See instructions).
the right and left slots of Stage 2, then make a series of pulls in Stage 3, alternating right and left
slots. Excessive use of Stage 2 will remove more metal along the edge than is necessary in order
to sharpen the teeth.
Because serrated blades are saw-like structures, the edges will never appear to be as “sharp” as
the edge on a straight edge knife. However, their tooth-like structure will, at times, help break the
skin on hard crusty foods and penetrate other materials such as cardboard.
Stage 3 Dress Tool: Cleaning/ Dressing of Stropping/ Polishing Disks—Stage 3:
The Triple Diamond™ by Mercer is equipped with a built-in accessory to manually clean/ dress
the honing disks in Stage 3. In the event these disks become glazed with grease, food or sharpening debris, they can be cleaned and reshaped by actuating the manual lever on the rear of the
sharpener. This lever is located within a recess as shown in Figure 13 on the left lower corner as
you face the rear of the Triple Diamond™ by Mercer.
To actuate the cleaning/dressing tool, make sure the power is on and simply press the small lever
in the recess to the right or left and hold for 3 seconds. Then press the lever in the opposite direction and hold for 3 seconds. When the lever is moved in one direction, the dressing tool cleans and
reshapes the active surface of one stropping/polishing disk. By moving it in the opposite direction,
you clean the other disk.
Use this clean/dress accessory only if and when Stage 3 no longer appears to be sharpening well
or when it takes too many pulls to obtain a razor sharp edge. Using this tool removes material
from the surface of the Stage 3 disks and hence, if used excessively, will unnecessarily remove
too much of the abrasive surface - wearing out the disks prematurely. If that should occur, factory
replacement of the disks will become necessary.
If you clean knives regularly before sharpening, you will need to clean or dress the Stage 3 disks
only about once a year or even less frequently
Resharpening: (See Sections above.)
Resharpen straight edge knives whenever practical using Stage 3. When that fails to quickly
resharpen, return to Stage 2 and make one or two pairs of alternating pulls check for a burr and
then return to Stage 3 where only one to two alternating pairs of pulls will be adequate to put a
new razor-like edge on the knife. Use Stage 1 as a first step in resharpening only if you wish to
have more “bite” along the edge or if the knife has been dulled excessively.
Resharpen serrated blades in Stage 3. (See sections above.)
Figure 13. Stage 3 disks can be cleaned if necessary.
Use infrequently. (See instructions.)
1. Always clean all food, fat and foreign materials from knife before sharpening or resharpening.
If soiled, wash the blade before sharpening.
2. Use only light downward pressure when sharpening - just enough to establish secure
contact with the abrasive disk.
3. Always pull the blade at the recommended speed and at a constant rate over length of blade.
Never interrupt or stop the motion of the blade when in contact with the abrasive disks.
4. Always alternate pulls in right and left slots (of any stage used). Specialized Japanese
blades are an exception and are sharpened primarily on one side of the blade.
5. The edge of the knife blade should be maintained while sharpening at a level position
relative to the top of the counter or table. To sharpen the blade near the tip of a curved blade,
lift the handle up slightly as you approach the tip so that the edge, as it is being sharpened,
is maintained “level” to the table.
6. It is not necessary to use a “sharpening steel” on knives sharpened on the Triple Diamond™ by Mercer Knife Sharpener. Consider resharpening with the Mercer Regular or
Diamond Steel if you are using knives at a remote location away from electrical power.
7. Used correctly, you will find you can sharpen the entire blade to within 1/8” of the bolster
or handle. This is a major advantage of the Triple Diamond™ by Mercer Knife Sharpener
compared to other sharpening methods - especially important when sharpening chef’s
knives where you need to sharpen the entire blade length in order to maintain the curvature of the edge line.
If your chef’s knives have a heavy bolster near the handle extending to the edge, a
commercial grinder can modify or remove the lower portion of the bolster so that it will not
interfere with the sharpening action allowing you to sharpen the entire blade length.
8. To increase your proficiency with the Triple Diamond™ by Mercer Knife Sharpener, learn
how to detect a burr along the edge (as described above). While you can sharpen well
without using this technique, it is the best and fastest way to determine when you have
sharpened sufficiently in Stages 1 and 2. This will help you avoid over sharpening and
ensure incredibly sharp edges every time. Cutting a tomato or a piece of paper is a convenient method of checking for blade sharpness.
No lubrication is required for any moving parts, motor, bearings or sharpening surfaces. There is
no need for water on abrasives. The exterior of the sharpener may be cleaned by carefully wiping
with a damp cloth. Do not use detergents or abrasives.
Figure 14. Clean-out cover.
Once a year or so, as needed, you can remove metal dust that will accumulate inside the
sharpener from repeated sharpenings. Remove the small rectangular clean-out cover (Figure 14)
that covers an opening on the underside of the sharpener. You will find metal particles adhered
to a magnet attached to the inside of that cover. Simply rub off or brush off accumulated filings
from the magnet with a paper towel or tooth brush and reinsert the cover in the opening. If larger
amounts of metal dust have been created or if the Stage 3 disk has been cleaned (using the
cleaning/dressing means), you can shake out any remaining dust through the bottom opening
when the cover is removed. After cleaning, replace the cover securely with its magnet in place.
In the event post-warranty service is needed, return your sharpener to Mercer where the cost of
repair can be estimated before the repair is undertaken. Outside the USA, contact your retailer or
national distributor.
Please include your return address, daytime telephone number and a brief description of the
problem or damage on a separate sheet inside the box. Retain a shipping receipt as evidence of
shipment and as your protection against loss in shipment.
Send your sharpener (insured and postage prepaid) to:
Mercer Cutlery
A Divison of Mercer Tool Corp.
Deer Park, NY 11729
Telephone (631) 243-3900 or Fax (631)243-3209
Assembled in the U.S.A.
This product may be covered by one or more patents and/or patents pending as marked on the product.
Conforms to UL Std. 982 Certified to CAN/CSA Std. C22.2 No. 64
Certified to EN 60335-1, EN 60335-2, EN 55014-1+A1, EN 61000-3-2, EN 61000-3-3
© EdgeCraft Corporation 2010
A11 C128214
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF