Miller Electric MTG Plus Tungsten Grinder User manual

MTG Plus
Tungsten Grinder
Processes
Description
TIG (GTAW) Welding
Tungsten Grinder
OM-230 915B 2007−03
Visit our website at
www.MillerWelds.com
File: TIG (GTAW)

Miller Electric manufactures a full line
of welders and welding related equipment.
For information on other quality Miller
products, contact your local Miller distributor to receive the latest full
line catalog or individual specification sheets. To locate your nearest
distributor or service agency call 1-800-4-A-Miller, or visit us at
www.MillerWelds.com on the web.
Thank you and congratulations on choosing Miller. Now you can get
the job done and get it done right. We know you don’t have time to do
it any other way.
That’s why when Niels Miller first started building arc welders in 1929,
he made sure his products offered long-lasting value and superior
quality. Like you, his customers couldn’t afford anything less. Miller
products had to be more than the best they could be. They had to be the
best you could buy.
Today, the people that build and sell Miller products continue the
tradition. They’re just as committed to providing equipment and service
that meets the high standards of quality and value established in 1929.
This Owner’s Manual is designed to help you get the most out of your
Miller products. Please take time to read the Safety precautions. They
will help you protect yourself against potential hazards on the worksite.
We’ve made installation and operation quick
and easy. With Miller you can count on years
of reliable service with proper maintenance.
And if for some reason the unit needs repair,
there’s a Troubleshooting section that will
help you figure out what the problem is. The
parts list will then help you to decide the
exact part you may need to fix the problem.
Warranty and service information for your
particular model are also provided.
Miller is the first welding
equipment manufacturer in
the U.S.A. to be registered to
the ISO 9001:2000 Quality
System Standard.
Working as hard as you do
−every power source from
Miller is backed by the most
hassle-free warranty in the
business.
From Miller to You
Mil_Thank 2005−04

TABLE OF CONTENTS
SECTION 1 −SAFETY PRECAUTIONS - READ BEFORE USING 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1. Symbol Usage 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2. Tungsten Grinding Hazards 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3. California Proposition 65 Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4. Principal Safety Standards 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2 −DEFINITIONS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1. Manufacturer’s Rating Label For CE Products 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2. Symbols And Definitions 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3 −SPECIFICATIONS 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1. Description 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2. Included With Your Unit 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3. Specifications 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 4 −INSTALLATION 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1. Connecting Input Power 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2. Connecting Grinder To Exhaust (Vacuum) Hose 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5 −OPERATION 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1. Grinder Components 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2. Grinding And Cutting Electrodes 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3. Replacing Grinding Wheels 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4. Installing Optional Double-Decker Kit 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-5. Installing Grinder Mounting Bracket 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6 −MAINTENANCE & TROUBLESHOOTING 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1. Routine Maintenance 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2. Troubleshooting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 7 −PARTS LIST 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OM-230 915 Page 1
SECTION 1 −SAFETY PRECAUTIONS - READ BEFORE USING
Tung_Grind 9/06
Warning: Protect yourself and others from injury — read and follow these precautions.
1-1. Symbol Usage
Means Warning! Watch Out! There are possible hazards
with this procedure! The possible hazards are shown in
the adjoining symbols.
Marks a special safety message.
Means “Note”; not safety related.
This group of symbols means Warning! Watch Out! possible
ELECTRIC SHOCK, MOVING PARTS, and HOT PARTS hazards.
Consult symbols and related instructions below for necessary actions
to avoid the hazards.
1-2. Tungsten Grinding Hazards
The symbols shown below are used throughout this manual to
call attention to and identify possible hazards. When you see
the symbol, watch out, and follow the related instructions to
avoid the hazard. The safety information given below is only
a summary of the more complete safety information found in
the Safety Standards listed in Section 1-4. Read and follow all
Safety Standards.
Only qualified persons should install, operate, maintain, and
repair this unit.
During operation, keep everybody, especially children, away.
ELECTRIC SHOCK can kill.
Touching live electrical parts can cause fatal shocks
or severe burns. The input power circuit and
machine internal circuits are also live when power is
on. Incorrectly installed or improperly grounded
equipment is a hazard.
Do not touch live electrical parts.
Wear dry, hole-free insulating gloves and body protection.
Disconnect input power before installing or servicing this
equipment.
Properly install this equipment according to its Owner’s Manual
and national, state, and local codes.
Frequently inspect input power cord for damage or bare wiring −
replace cord immediately if damaged −bare wiring can kill.
Turn off all equipment when not in use.
Use only well-maintained equipment. Repair or replace damaged
parts at once. Maintain unit according to manual.
Keep all panels and covers securely in place.
Grinding produces dust. Breathing this dust can be
hazardous to your health.
GRINDING DUST can be hazardous.
Do not breathe the dust.
Use local exhaust (forced ventilation) to remove dust or wear an
approved respirator.
Grinding dust from thoriated electrodes contains low-level radio-
active material. Consider using tungsten containing ceria,
lanthana, or yttria instead of thoria.
Properly dispose of grinder dust in an environmentally safe way.
Read and understand the Material Safety Data Sheets (MSDSs)
and the manufacturer’s instructions for metals and consumables.
GRINDING can cause FIRE OR EXPLOSION.
Do not grind where flying sparks can strike
flammable material.
Protect yourself and others from flying sparks
and hot metal.
Be alert that sparks and hot materials from grinding can easily go
through small cracks and openings to adjacent areas.
Watch for fire, and keep a fire extinguisher nearby.
FLYING SPARKS can cause injury.
Wear a face shield to protect eyes and face.
Shape tungsten electrode only on grinder with proper
guards in a safe location wearing proper face, hand,
and body protection.
Sparks can cause fires — keep flammables away.
HOT PARTS can cause severe burns.
Do not touch hot parts bare handed.
Allow cooling period before touching parts.
To handle hot parts, use proper tools and/or
wear heavy, insulated welding gloves and
clothing to prevent burns.
OVERUSE can cause OVERHEATING
Allow cooling period; follow rated duty cycle.
Keep air holes free of dust; clean if necessary.
READ INSTRUCTIONS.
Read Owner’s Manual before using or servic-
ing unit.
Use only genuine Miller replacement parts.
MOVING PARTS can cause injury.
Keep away from moving parts.
Keep all doors, panels, covers, and guards
closed and securely in place.
Have only qualified persons remove doors,
panels, covers, or guards for maintenance as
necessary.
Reinstall doors, panels, covers, or guards
when maintenance is finished and before re-
connecting input power.

OM-230 915 Page 2
1-3. California Proposition 65 Warnings
Welding or cutting equipment produces fumes or gases which
contain chemicals known to the State of California to cause
birth defects and, in some cases, cancer. (California Health &
Safety Code Section 25249.5 et seq.)
1-4. Principal Safety Standards
Safety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1,
from Global Engineering Documents (phone: [phone], website:
www.global.ihs.com).
Recommended Safe Practices for the Preparation for Welding and Cut-
ting of Containers and Piping, American Welding Society Standard
AWS F4.1 from Global Engineering Documents (phone:
1-877-413-5184,website: www.global.ihs.com).
National Electrical Code, NFPA Standard 70, from National Fire Protec-
tion Association, P.O. Box 9101, 1 Battery March Park, Quincy, MA
02269−9101(phone: 617−770−3000, website: www.nfpa.org).
Safe Handling of Compressed Gases in Cylinders, CGA Pamphlet P-1,
from Compressed Gas Association, 1735 Jefferson Davis Highway,
Suite 1004, Arlington, VA 22202−4102 (phone: 703−412−0900, web-
site: www.cganet.com).
Code for Safety in Welding and Cutting, CSA Standard W117.2, from
Canadian Standards Association, Standards Sales, 178 Rexdale
Boulevard, Rexdale, Ontario, Canada M9W 1R3 (phone:
800−463−6727 or in Toronto 416−747−4044, website: www.csa−in-
ternational.org).
Practice For Occupational And Educational Eye And Face Protection,
ANSI Standard Z87.1, from American National Standards Institute, 11
West 42nd Street, New York, NY 10036−8002 (phone: 212−642−4900,
website: www.ansi.org).
Standard for Fire Prevention During Welding, Cutting, and Other Hot
Work, NFPA Standard 51B, from National Fire Protection Association,
P.O. Box 9101, 1 Battery March Park, Quincy, MA 02269−9101 (phone:
617−770−3000,website: www.nfpa.org).
OSHA, Occupational Safety and Health Standards for General Indus-
try, Title 29, Code of Federal Regulations (CFR), Part 1910, Subpart Q,
and Part 1926, Subpart J, from U.S. Government Printing Office, Super-
intendent of Documents, P.O. Box 371954, Pittsburgh, PA 15250 (there
are 10 Regional Offices−−phone for Region 5, Chicago, is
312−353−2220,website: www.osha.gov).
About Pacemakers:
Pacemaker wearers consult your doctor before welding or going near
welding operations. If cleared by your doctor, then following the above
procedures is recommended.

OM-230 915 Page 3
SECTION 2 −DEFINITIONS
2-1. Manufacturer’s Rating Label For CE Products
2-2. Symbols And Definitions
Some symbols are found only on CE products.
NOTE
Output Alternating Current AAmperes VVolts
Single Phase Line Connection Hz Hertz Read Instructions
Notes
Work like a Pro!
Pros weld and cut
safely. Read the
safety rules at
the beginning
of this manual.

OM-230 915 Page 4
SECTION 3 −SPECIFICATIONS
3-1. Description
The MTG Plus cuts, grinds, and planes tungsten electrodes used in the TIG (GTAW) welding process. Additional fea-
tures and benefits of this unit are:
•Electrodes are sharpened to conform to recognized standards.
•The replaceable grinding wheel is diamond-coated on both sides.
•The grinding wheel has an offset edge for easy cutting −an industry exclusive!
•The head assembly allows for different electrode angles and diameters.
•The unit can be hand operated, or wall or table-mounted using the supplied mounting bracket.
Grinding the tungsten electrode produces dust and flying sparks which can cause injury and start fires. Use local exhaust (forced ven-
tilation) at the grinder or wear an approved respirator.
Read MSDS for safety information. Consider using tungsten containing ceria, lanthana, or yttria instead of thoria. Grinding dust from
thoriated electrodes contains low-level radioactive material. Properly dispose of grinder dust in an environmentally safe way. Wear
proper face, hand, and body protection. Keep flammables away.
3-2. Included With Your Unit
1 MTG Plus Tungsten Grinder
With Diamond Grinding Wheel
2 Steel Carrying Case
3 Electrode Holder With
Clamping Collet
4 Torx Screwdriver
5 Mounting Bracket
804 716 / Ref 804 762
1
2
4
3
5

OM-230 915 Page 5
3-3. Specifications
Dimensions Weight Input Power Power-On Time Cord
Length
Rotary
Speed
2.6 x 13.8 in
(65 x 250 mm)
3 lb (1.4 kg)
(w/Grinding Wheel)
120 V AC
50/60 Hz
(500 watt
Rating)
100% 9.8 ft
(3 m)
30,000
RPM
(U/min)
Noise
Rating
Vibration
Level
Electrode
Material Electrode Angles Electrode Diameters
83 dBa
(per EN23741)
2.5 m/s2
(per EN28662, Part 1)
Tungsten electrodes
alloyed with zirconium,
lanthanum, and cerium
Consult country-spe-
cific regulations for
electrodes containing
Thorium.
15°
18°
22.5°
30°
0.04 in (1 mm)
1/16 in (1.6 mm)
3/32 in (2.4 mm)
1/8 in (3.2 mm)
5/32 in (4 mm)
SECTION 4 −INSTALLATION
Operation
4-1. Connecting Input Power
804 717
1 Rating Label
2 Power Cord
3 120 Volt AC Plug
4 AC Receptacle
Connect plug to matching AC re-
ceptacle. See rating label for elec-
trical specifications.
2
3
4
1

OM-230 915 Page 6
4-2. Connecting Grinder To Exhaust (Vacuum) Hose
804 811
Grinding the tungsten elec-
trode produces dust and fly-
ing sparks which can cause
injury and start fires. Use lo-
cal exhaust (forced ventila-
tion) at the grinder or wear an
approved respirator.
Read MSDS for safety infor-
mation. Consider using
tungsten containing ceria,
lanthana, or yttria instead of
thoria. Grinding dust from
thoriated electrodes con-
tains low-level radioactive
material. Properly dispose
of grinder dust in an environ-
mentally safe way. Wear
proper face, hand, and body
protection. Keep flammables
away.
1 Grinder
2 Exhaust (Vacuum) System
The grinding head is designed to
accept a 1−1/4 in (32 mm) exhaust
(vacuum) hose.
Connect the grinder to the exhaust
(vacuum) hose as shown.
The optional protective cover/
adapter can also be used to con-
nect the exhaust (vacuum) hose to
the grinder.
1
2
Notes
BUTT
BUTT
BUTT BUTT
T−JOINT T−JOINT
T−JOINT T−JOINT
FILLET
GROOVE
FLAT VERTICALHORIZONTAL OVERHEADWELD POSITION:
WELD JOINT
TYPES
Ref. AWS/ANSI D1.1
1G
1F
2G
2F
3G
3F
4G
4F
Ref. 804 248-A