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.•••
TOOL
GRINDER
FOR LENGTHENED TOOL LIFE
FOR INCREASED PRODUCTION
1
FOR LOWERED COSTS
CATALOG 220-2
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'akina better products to make other products better
Page 2
The
:
NORTON
No. 2 BUR A-WAY
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Grinds Convex Single Point and Form Fools
$ With constant relief in the direction of feed — which provides a uniform sup
port to the cutting edge
With exact duplication of master tool form in any number of production
tools
•3
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2
Page 3
A Better Means —
A Better Tool
Benefits from Tool Control
The Norton No. 2 BURA-WAY* Tool
Grinder provides a better means for grinding
convex
single point and form tools because it
generates, reproduces and maintains relief an
gles constant as measured in the direction of
feed.
This advantage provides the entire
cutting edge of the tool with a uniform sup
port including those sections wherein curva
ture, a radius or radii are involved. This
unique capacity, plus the extreme rigidity of
the machine, its spindle reciprocating feature,
and the manner of tool support, results in a
superior long-life tool which increases pro
duction and lowers costs.
Precise DujMjcation
In grinding profile and relief, an original or
master tool is used to generate a large-sized
template. This template is used to duplicate
any number of production tools all precisely
alike. The template is also used to maintain
and keep constant the correct profile and re
lief angles with each regrinding of the tool.
With this machine, it is possible for the tool
designer to design the ideal tool that will
have the longest life and which will produce
more pieces per sharpening.
la addition to these advantages, the No. 2
BURA-WAY Tool Grinder provides the
means whereby tremendous benefits may be
realized through the medium of an effective
tool crib control system. Because of exact
duplication of the master or model tool form
by accurate mechanical means, this machine
makes it possible to determine the life of the
edge of each cutting tool in each operation.
This makes it possible to establish a control
whereby each tool is returned to the crib
before its full cutting life is expended. These
tools may then be touched up with a light re-
grinding, thus avoiding salvaging operations.
Benefits of Cylindrical Grind
With the No. 2 BURA-WAY Grinder the
benefits of the cylindrical type of grind are
obtained. Heretofore, this type of grind on a
cutting tool was not possible with existing
equipment. With the cylindrical type of grind,
the maximum possible support under the cut
ting edge of the tool is obtained, thus assuring
better cutting action and longer tool life. With
these advantages, the tool designer benefits by
the removal of design limitations, preventing
producing most efficient tool shapes.
Universal
Tool Holder
The Universal Tool Holder supplied with the
machine holds tool bits up to 2" square shank.
Setups are simple and accurate, precisely dupli
cated, and can be quickly made. For grinding
the rake angle, a special fixture is available.
Angles ground are under positive control and
tool form is not changed, but is automatically
maintained with each regrinding.
long Life for Ca
Carbide tipped tools have extremely long life
when ground and reground in this precision
machine which is built to.the most exacting
standards. These result in exceptionally
smooth operation which, with the manner of
tool support, assures a smooth, keen cutting
edge so important to the life of the tool.
*Reg. U. S. Pat. Off.
rbide Tipped Tools
3
Page 4
J*
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V
SECTIONS
A
B [
<
FEED
TOOL
Ground in the coq#tntional manner, this tool has three times the
relief, in the^Hfection of feed, at the corner radius, as indicated
Excess Relief in
Direction of Feed
1
by parallel sections at AA and BB. For this reason, section AA
is tj^^vell-known breakdown point of this tool,
bfte tool is buried deepest in the work and should have the great-
/^est support and most material for heat dissipation whereas actu-
ally it has the least support and the least material.
A
B
i [
7">
U-
SECTIONi3B
/
/
/
AA
BB
m
—
>
/
SECTION AA
It is here that
UJ
/
U-
/
/
Typicoi Weakness
of Hose Tool
TOOL
V
\
\
\
'
A nose tool ground in the conventional manner has uniform re
lief,
as
edge. But it has excess relief in the direction of feed, wi
result that the cutting edge has many weak points where it is
deprived of the maximum material for support and heat dissipti-
tion as shown by sections AA, BB and CC.
WlO'
\
\
\
measured radially, around the periphery of the cutting
h the
: It is
\
the
Bum-Way
V
J Lie? J Wicfj Lie?
SECTION BB
A Better Support
for Longer Life
TOOL
The same tool ground the Bura-way has constant relief in the
direction of feed, and uniform support under the cutting edge
at all sections, including the radius. It has the greatest support
and greatest capacity for heat dissipation.
Actually,
as measured in the direction of feed, is about
greater than at section AA. By following a special procedure,
even this slight increase in the angle can be eliminated, but is
unnecessary for all practical purposes.
the relief angle at the extreme tip of the corner radius,
4
SECTION AA
degrees
Ll.
TOOL
Constant Relief
Loog-Ufe
Support
When ground the Bura-way, the relief angle varies, as measured
radially. However in the direction of feed, the angle of relief
is constant and the cutting-edge support is uniform at all points
and the maximum material is available for greatest heat dissipa
tion as shown by sections AA, BB and CC.
5
Page 5
FEATURES OF DESIGN
Elevated enclosure houses
starters
Wheel face trued by
this swinging arm
tains location of wheel face with
respect to the calibrating block
and the template stop bar
Calibrating block integral with
truing arm is used in making
templates
Wheel guard Is easily swiveled
for grinding with either side of
wheel
Template quickly placed
removed on tool holder
diamond
which
main
in
Coolant reservoir allows gravity
feed of coolant to work
1 h.p. totally enclosed ball bear
ing
motor
drives wheel
Wheel slide is supported on
dovetail ways with large sup
port area end gibs for adjustment
Wheel spindle oscillation of Yj
eliminates fatiguo. No tool
holder movement necessary
Template stop bar has strip of
Norbide (Boron Carbide) which
is hardest substance made by
man—precision duplication as
sured
”
Wheel feed handwheel is locking
type, is graduated to .0005", and
quickly positions wheel
Tilting work fable* may bo ad
justed very quickly for any angle
up to ±10°
Table setting vernier* assures
accurate settings of table to l'
of arc. Graduations provided
for angles up to 10°
j
L
Universal anglo gage* estab
lishes grinding position of tool
in
tool
holder
. 1
4
• Coolant tank has capacity of
25
gallons
<««m. marked*
are optional at extra cost)
Table tilting handwheel* is
locking-type and is conveniently
located
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6
L
Page 6
Advantages that produce a
UNIVERSAL TOOL HOLDER
The Universal Tool Holder can be tilted and
rolled
for clearance and rake angles. This fea
ture makes it possible to attain the cylindrical
type
ol
grind rather than the conventional grind,
when the table is flat. The tool holder is also
adjustable laterally for side cutting edge. A
Master Tool Protractor Attachment to adapt the
tool holder for grinding the cutting edge angle
on
model tools is available at extra cost.
GRINDING MODEL TOOLS
This machine makes possible the grinding of a
model
tool. With the Master Tool Protractor
and the Universal Angle Gage which is also
available as an extra, it is possible to make a
model tool from a bar of plastic material or soft
steel. The various steps in this process are
shown
in
the chart on the next page.
Grinding rake surface of tool using protractor attachment on
universal tool holder
TEMPLATES
Once the model tool is made, a template is
ground from the model tool. Templates are
also
made from master tools. Thereafter, regu
lar production tools are reground from the tem
plate and the shape or location of the tool is
always assured from one grind to another with .
absolute duplication through accurate mechani
cal means. Steps in regrinding production tools
are shown on page 9.
This is an important advantage, especially for
automatic machines using multiple tool setups.
These tools can be sharpened in the No. 2
BURA-WAY Tool Grinder and then set back
in the automatic machine quickly from a refer
ence point without going through the process of
indicating
each and every tool.
The template material is a plastic which is very
easy to grind. In addition, templates are easily
marked for the tilt and roll settings of the tool
holder as well as the tool number, so that setups
can be duplicated quickly each and every time
that particular type of tool is to be ground.
Generating a template from profile of a master tool. Note use
of template block
in this
operation
Grinding carbide-tipped tool. Note template contacting template
stop bar
Page 7
METHOD
OF MAKING MASTER TOOL
AND GENERATING TEMPLATE
BLUE PRINT OF TOOL. TO BE GROUND
STEP 4
Grind template from sharp
cornered model tool from step 3
STEP 5
Generate radius on nose of
model tool retracting grinding
wheel by amount of radius and
using template "A"
STEP 1
Grind rake on
plastic blank
scribe line local- rect cutling edge versol angle gage
ing intersection of angles using pro
cutting edges
STEP 2
Grind end surface*
square and
tractor attachment
to
cor- surfaces using uni
STEP 3
Grind relief on end
STEP 6
Finish template "A to refine
radius from round nosed model
1
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WRINONQ
WHIIL
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'a'LESSToa
MOST ftADCrt
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CALIBRATING
BLOCK FOR T
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UNTIL
KAOM* «
6 AO U HO
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8
Page 8
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Page 9
EQUIPMENT INCLUDED IN MACHINE PRICE
1.
Wheel spindle—ball bearing—cartridge
type
10. Calibrating block and truing arm unit
11. Wrenches and pulleys
2. Wheel spindle oscillating arrangement
3.
Wheel
4. Universal tool holder
5. Template step block
6. Template stop bar
7.
Diamond
8. Six tool holder inserts
9. Twelve plastic template blanks
guard and coolant pipe
setting gage
12. Wet grinding attachment including coolant
tank, pump and ]/q h.p., 1725 r.p.m. in
tegral
motor and control
13. 1 h.p., 3600 r.p.m. totally enclosed ball
bearing
14. Electrical enclosing case wired to Machine
Tool Electrical Standards
15. Three grinding wheels as follows:
1—7" x 1 y2" x 3" plate mounted
1—7" x 1 y2
1—7" x 1%" x 114" Diamond wheel
motor with control
ALUNDUM
" x 3" plate mounted
CRYSTOLON
EQUIPMENT AVAILABLE AT EXTRA COST
TABLE TILTING MECHANISM
Very helpful for tools such as parting tools
which require relief on each side, 180 apart
Vernier
with this mechanism. This indicates angle of
table setting within one minute of arc
scale at front of machine is provided
MASTER TOOL PROTRACTOR AT
TACHMENT
Used with Universal Angle Gage in grinding
model tools
also be used with Universal Tool Holder
May
for
grinding rake surfaces
TO
RAKE GRINDING FIXTURE
Simplifies grinding of rake angles when a range
of these must be ground
>1
4
A revolving sleeve carried in a swivel bracket
permits
back rake angles
UNIVERSAL ANGLE GAGE
Used with Master Tool Protractor Attachment
in grinding model tools
Establishes
tool holder
swiveling both for positive and negative
grinding position of model tool in
Page 10
SPECIFICATIONS
TYPE
Motor Drive, with handwheel slide feed and ar
ranged for wet or dry grinding.
CAPACITY
Convex Single Point Cutting Tools up to 2"
Square Shank
Relief Angles
Up to and incl 15°
Side Rake Angles (Positive or Negative)
Up to and incl 30°
Back Rake Angles (Positive or Negative)
Up to and incl 25°
GRINDING WHEEL
7" Dia. Plate Mounted Cup Wheel up to 2"
Face
SPINDLE OSCILLATION
Total Oscillation
Rate of Oscillation ..115
. .. y
2 inch
Complete Osc. per Min.
GRINDING WHEEL SPINDLE
Precision Bearing Cartridge Type
COOLANT SYSTEM
Automatic Coolant System
Tank 25 gal. capacity
ELECTRICAL EQUIPMENT
Main Drive—1 h.p., 3600 r.p.m. motor with
manual starter and reversing switch
Coolant Pump—
drive
motor and controls
% h.p., 1800 r.p.m., integral
FLOOR SPACE
Floor Space—41" wide x 47" deep x 61" high
WEIGHTS (Approximate)
Net, Pounds
Domestic Shipping, Pounds
Export Shipping, Pounds. ..
Cubics—boxed for export
....................
. ..
.2200 lbs.
.2650 lbs.
.2900 lbs.
102 cu. ft.
P.
r
t
Because of variations in equipment and castings, exact weights and cubics cannot be given. The above weights are in pounds;
cubics are in cubic feet. Motor weights are included.
The descriptions, illustrations and specifications in this booklet are correct at the time of printing. Since the policy of Norton
Company is constantly to improve its machines, those built at later dates may differ from these details to some extent.
" The No. 2 Bura-Way Grinder assures exact
tool form duplication by a precise mechanical
means.
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Page 11
NORTON
MACHINES For
GRINDING and LAPPING
>:•
10" x 20"
atlc Cylindrical Grinder
_________.___
[i
Universal
Grinder
PRODUCTS
ABRASIVES • GRINDING WHEELS • REFRACTORIES
FLOOR AND STAIR TILE • AGGREGATES • NORBIDE
PRODUCTS
CYLINDRICAL GRINDING • SURFACE GRINDING
CYLINDRICAL AND FLAT LAPPING • UNIVERSAL TOOL
AND CUTTER GRINDING
SPECIALIZED GRINDING • CAM AND SHAPE GRINDING
CRANKPIN AND CRANKSHAFT BEARING GRINDING
VALVE GRINDING • ROLL GRINDING • SPECIAL AIRCRAFT
PRODUCTION GRINDING • ATTACHMENTS AND EQUIP
•
ENCAPSULATING MACHINES
MACHINES FOR
UNIVERSAL GRINDING
MENT FOR SPECIAL WORK
-*=E=>-
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No. 20 Cottor and Tool Grinder
8" x 24"
Surface Grinder
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m
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WA
10x36 " Semiautomatic Cyllndrlca I Grinder
DISTRIBUTORS IN
MACHINE DIVISION OFFICES
Hartford 7
New York 6
Cleveland 3
Detroit 8
Chicago 32 . .
Cable Address: NORBEMO. Worcester
ALL PRINCIPAL CITIES THROUGHOUT THE WORLD
. . 4737 South Christiana Avenue
998 Farmington Avenue
...
61
Broadway
1306 East 55th Street
. 5805 Lincoln Avenue
No. 26 HYPROLAP* Lapping Machine
♦Trade Mark Reg. U.S. Pah Off.
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