DAREX V390
®
Drill Sharpener
1/8” (3mm) to ¾” (19mm) size range
OPERATING
INSTRUCTIONS
PP11852KF
03/20/06
Operating
Instructions
CAUTION! To reduce the risk of injury, the user must read and understand this
instruction manual before using product. Save these instructions for future reference.
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Table of Contents
The Darex Story......................................................................................... Page 3
Safety Instructions..................................................................................... Page 4
Getting to Know Your V391......................................................................... Page 5
Drill Information......................................................................................... Page 6
Quick Step Instructions............................................................................... Page 7-8
Detailed Operating Instructions.................................................................... Page 9-11
Machine Adjustments.................................................................................. Page 12-13
Troubleshooting.......................................................................................... Page 14-15
Maintenance Instructions............................................................................. Page 16-17
Drawings & Parts List.................................................................................. Page 18-19
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The Darex Story
Darex Corporation began in 1973 in Beecher, Illinois. The D, A and R of Darex are the initials of three
generations of the Bernard family; David, Arthur and Richard Bernard. David and his father Richard
founded Darex. Grandfather Arthur Bernard, who earlier founded the Bernard Welding Company
contributed his energy and guidance to Darex until his death. Art’s inventions revolutionized the
welding industry.
In 1978, Darex relocated to Ashland, Oregon. Grandson Dave and son Dick carry on Arthur’s legacy of
inventiveness. Darex grew to become the most recognized name in the cutting tool sharpening
industry. Today, Darex is a world-leading manufacturer of precision cutting tool sharpeners.
Darex is proud to offer a complete line of quality precision cutting tool sharpeners at affordable prices.
Before our first days, we at Darex had looked at our competitor’s sharpeners and asked ourselves:
”Must cutting tool sharpeners be complicated?
prohibitive accuracy or low price inaccuracy?” Our sharpeners prove you can have it all: simplicity,
accuracy and affordability.
We have always emphasized innovative product design and tested technology. The experienced
personnel at our modern manufacturing facility use the latest production methods. The Darex
marketing team knows first-hand the machines we sell and will guide you to the best machine for
your needs. Our skilled technical service department is happy to answer your questions about our
products or cutting tools.
Why must the choice in sharpeners have either cost
The V390
This limited duty unit is the most economically priced of the Darex Industrial Sharpeners. It is
designed for the small fabrication or job-shop where a lower volume of drill sharpening is required.
Point angle range is 118 to 140 degrees. Size range is 1/8” to ¾” (3mm to 19mm). This sharpener
has point splitting capabilities. With the standard electroplated CBN (Cubic Boron Nitride) grinding
wheel the V390 will sharpen hig
electroplated diamond wheel is available to sharpen carbide drill bits. The electroplated diamond and
CBN wheel will sharpen approximately 1000-2000 drills before replacement is required. The Darex
V390 is most efficient when used to sharpen drill bits to their original point angle. The troubleshooting
section of this manual is designed to anticipate many common questions and applications. To keep
your DAREX V390 in top condition, please refer to the maintenance section of this manual. A complete
schematic breakdown, replacement wheels and parts are listed on page 18 and 19.
h-speed steel, cobalt, parabolic, TiN and other coated drill bits. An
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Safety Instructions
WARNING:
REMEMBER FOR YOUR OWN SAFETY, READ INSTRUCTION MANUAL
BEFORE OPERATING TOOL AND SAVE THESE INSTRUCTIONS.
Wear Eye Protection. Never touch internal parts of the sharpener
when the sharpener is on. The rotating grinding wheel can cause
injury. Use caution when replacing the grinding wheel. Follow
instructions entitled “Replacing The Grinding Wheel”, in this
Instruction Manual. Regularly empty accumulated grinding dust.
Follow instructions entitled “DAREX V391 Maintenance” in this
Instruction Ma
WARNING: WHEN USING ELECTRIC TOOLS, BASIC SAFETY
PRECAUTIONS SHOULD ALWAYS BE F
RISK OF FIRE, ELECTRIC SHOCK AND PERSONAL INJURY,
INCLUDING THE FOLLOWING:
1.KEEP GUARDS IN PLACE and in working order. Never perform
grinding operation with the wheel cover removed.
2. REMOVE WRENCHES. Form a habit of checking to see that the
wrench is removed from tool before turning it on.
3 .KEEP WORK AREA CLEAN. Cluttered areas and benches invite
accidents.
4. DON’T USE IN DANGEROUS ENVIRONMENT. Do not use power
tools in d
5. STORE EQUIPMENT in a safe place when not in use. Keep out
of reach of children.
6. DON’T FORCE TO
rate for which it was designed.
7. USE THE RIGHT TOOL. Don’t force tool or attachment to do a
job it was not designed for.
8. ALWAYS USE SAFETY GLASSES. Also use face or dust mask if
cutting operation is dusty. Everyday eyeglasses only have
impact resistance lenses, they are NOT safety glasses.
9. MAINTAIN TOOL WITH CARE. Keep tools
best and safest performance.
10. DISCONNECT TOOLS from the power supply before service.
11. AVOID ACCIDENTAL STARTING Make sure switch is in the “OFF”
position before plugging it in.
12. USE
manual for recommended accessories. The use of improper
accessories may cause hazards.
13. CHECK FOR DAMAGED PARTS. Before further use of the tool, a
guard or other part that is damaged should be carefully checked to
assure that it will operate properly and perform its intended
function. Check for alignment o
parts, breakage of parts, mounting and any other conditions that
may affect its operation. A guard or other part that is damaged
should be properly repaired or replaced.
14. DO NOT USE DAMAGED OR UNSHAPED WHEELS. Use grinding
wheels suitable for speed of grinder.
5. NEVER LEAVE TOOL RUNNING UNATTENDED. Turn power off.
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16. USE PROPER EXTENSION CORD. Make sure extension cord is in
good condition. When using an extension cord be sure to use one
heavy enough to carry the current the Drill Sharpener will draw. An
undersize cord will
power and/or overheating.
17. The continuous A-weighted equivalent sound pressure level at
the operator’s ear is not over 60 dB (A).
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8. Risk of injury due to accidental starting. Do not use in an area
where children may be present.
19. WARNING: This product contains a chemical
known to the State of California to cause cancer.
Some dust created by power sanding and grinding
as well as contents from the machine may contain
chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
20. The weight root mean square acceleration value
to which the arms are subjected to does not exceed
2.5 m/s .
nual.
OLLOWED TO PREVENT THE
amp or wet locations, or expose them to rain.
OL. It will do the job better and safer at the
sharp and clean for
RECOMMENDED ACCESSORIES, Consult the owner’s
f moving parts, binding of moving
cause a drop in line voltage,
resulting in a loss of
Fig .1
Grounding
methods
2
21. TO MINIMIZE THE RISK OF INJURY, ALWAYS USE
PROPER EYE AND RESPIRATORY PROTECTION: Everyday
eyeglasses only have impact resistance lenses and they are
NOT safety glasses. (See Decal at Left.) Use appropriate
respiratory face or dust mask.
GROUNDING INSTRUCTIONS
1. All grounded, cord connected tools:
In the event of a malfunction or breakdown, grounding provides a
path of least resistance for electric current to reduce the risk of
electric shock. This tool is equipped with an electric cord having an
equipment-grounding conductor and
must be plugged into a matching outlet that is properly installed and
grounded in accordance with all local codes and ordinances.
Do not modify the plug provided-if it will not fit the outlet, have the
proper outlet installe
Improper connection of the equipment-grounding conductor can
result in a risk of electric shock. The conductor with insulation,
having an outer surface that is green with or without yellow stripes,
is the equipment-grounding conductor
the electric cord or plug is necessary, do not connect the
equipment-grounding conductor to a live terminal.
Check with a qualified electrician or serviceman if the grounding
instructions are not completely understood, or if in doubt as to
whether the tool is properly grounded.
Use only 3-wire extension cords that have 3-prong grounding plugs
and 3-pole receptacles that accept the tool’s pIug.
pair or replace damaged or worn cord immediately. See table 1
Re
minimum gauge cord below.
2. Grounded, cord-connected tools intended for us
circuit having a nominal rating less than150 volts:
This tool is intended for use on a circuit that has an outlet that looks
like the one illustrated in Figure A. The tool has a grounding plug
that looks like the plug illustrated in Figure A. A temporary adapter
which looks like the adapter illustrated in Figures B and C, may be
used (except in Canada) to connect this plug to a 2-pole receptacle
as shown in Figure B, if a proper
The temporary adapter should be
grounded outlet can be installed by a qualified electrician. The green
colored rigid ear lug, etc. extending from the adapter must be
connected to a permanent ground such as a properly grounded
outlet box. See Fig. 1. Grounding methods below.
3. Grounded, cord-connected tools intended for use on a
supply circuit having a nominal rating between 150-250 volts,
inclusive. See Table 1. Minimum gauge for cord below.
Table 1. Minimum Gauge Cords
d by a qualified electrician.
Cover of
Grounding Pin
grounded
outlet box
a grounding plug. The plug
. If repair or replacement of
e on a supply
ly grounded outlet is not available.
used only until a properly
Metal
Screw
Grounded
Means
Grounding Pin
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Getting to know your V390
Before you sharpen your first drill bit, please take a few minutes to familiarize yourself with your
new DAREX V390 Drill Sharpener and its basic parts and features (shown below). The time it takes
to read this page and the remainder of the manual will be made up when you sharpen your first drill
bits.
Vacuum Port
Point Split
Port Depth
Adj.
Knob
Point Split
Port
Point Split
Angle Adj.
Bracket
Material Removal
Knob
Wheel Cover
Sharpening Port
Point Angle Bracket
Point Angle Lock Knob
Chuck
Relief Paddle
On / Off
Switch
Relief Setting Numbers
Viewing Port
Alignment Port
Quick Step
Instruction
Specifications
x Recommended use: The V390 is a light duty sharpener, recommended use is 30 - 50 drills per
week.
x Sharpen: Two flute twist drill bits SAE and metric. HSS, Cobalt, TiN coated, Parabolic. Reduced
shank drill bits. Carbide drill bits require the optional diamond wheel. Unlimited maximum drill
bit length.
x Capacity: 1/8" to 3/4", 3mm to 19mm
x Accuracy: ANSI Standards.
x Wheel care: Does not require coolants. Wheels are super-abrasive and electroplated and do not
require truing or dressing.
x Cycle time: Typically a 1/8" drill bit can be sharpened within 15 seconds and a 3/4" drill bit will
take up to 60 seconds. Material removal is adjustable.
x Motor: 115 volt, 4.5 amp, 60hz, 3450 RPM
x Machine dimensions: 12" x 11" x 9"
x Packing dimensions: 17" x 15" x 11.5"
x Weight 18 lbs. (8.2 kg)
x Shipping Weight: 24 lbs. (11 kg)
x Operating ambient temperature range: 4 - 35C (40 - 95F)
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Drill Information
118º STANDARD POINT: This drill bit point angle is considered a
standard general-purpose geometry. It is used for drilling soft or mild
materials such as cold rolled steel, aluminum, and wood. Typically the
standard drill bit is made of High Speed Steel (HSS). The tip of the
drill bit can easily be split making it a high performance drill bit.
135º HIGH PERFORMANCE SPLIT-POINT: The flatter point angle of this
drill is designed for harder, tougher materials such as tempered steels,
hard alloys or hard cast metals. Due to the thicker web and flat point
angle this drill point works best when its split-point is maintained.
SPLIT POINTS: Split point drill bits do not walk around on the material
before they begin to cut. This feature is described as self-centering.
Center punching or center drilling is
bit chisel point has to wear an area in the middle of the hole prior to
the cutting lips removing material. Due to its additional cutting lips
along the chisel edge, a split point will begin cutting immediately. Much
less thrust is required to drill a hole with a split point as compared to a
non-split or conventional point. You can split either the 118º or the
135º degree points on this DAREX V390 precision Drill Sharpener.
often eliminated. A standard drill
Included Point
Angle
118
135
CARBIDE DRILL BITS: This point angle is typically 130º to 135º.
Carbide is harder and more brittle than high speed steel and cobalt.
This type of drill is used for drilling te
With an optional diamond wheel carbide drill
your DAREX V390 Drill Sharpener equipped with an optional diamond
wheel.
PARABOLIC AND COBALT DRILL BITS: These drills have a thicker web
than regular drill bits. Parabolic drill bits are designed to drill deep
holes. Cobalt drill bits are for drilling tougher metals. They are extra
thick in the center, (web) and have split points. Often these bits are
Titanium Nitride coated. TiN is applied to increase a drill bits cutting
efficiency. Most of these drill bits can be sharpened with your DAREX
V390 Drill Sharpener.
LIP RELIEF ANGLE: The relief on a drill bit is the downward angle
between the cutting lips (leading edge) and the heel (trailing edge) on
he drill point. If the drill bit cutting lips are no
t
then the drill bit will not cut into the material. This is often referred to
as negative relief. (see page 11
Drill Sharpener is designed to grind a standard factory relief on your
drill bits.
CHISEL EDGE ANGLE: The chisel edge is the line in the center of the
drill bit where both cutting surfaces intersect. Note that in the drawing
(seen at right) the chisel edge angle is between 120º and 135º.
Another way to look at this is to imagine the drill point as a clock face.
With the cutting lips horizontal, the chisel edge should point to the 1
and 7 o’clock positions. This is the most common drill bit chisel angle.
The degree of this angle is directly affected by the amount of lip relief
ground on the drill. Excessive relief on the drill bit will rotate the chisel
angle clockwise and vise versa.
mpered steels, alloys, glass, etc..
bits can be sharpened on
t higher than the heel,
About Relief Settings
) The DAREX V390
Lip Relief
Angle
8 to 12
Flute
Length
Cutting Lip
Heel
Web
WEB: The web is the core thickness of a drill point. A new
typically around 18% of the drill bit diameter. As a drill bit is sharpened
and becomes shorter the web thickness will increase. Splitting the point
or thinning the web on a drill bit will maintain drill bit performance.
HSS drill is