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GRINDING CRANKPIN OF CRANKSHAFT ASSEMBLY 20" TYPE C HI-SWING
NORTON
T
ype
C
rankshaft
“
C
” Hi-S
G
wing
rinders
23
fj
V
” »
26
”
'
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NORTON
TYPE "C" HI-SWING
CRANKSHAFT
This grinder is, as its name implies, designed expressly for the grinding
of long throw crankshafts such as those used in radial types of airplane motors,
gas engines, compressors, etc., which require exceptional swing for clearance. The
machine is also recommended for a variety of comparatively light work which,
because of its shape or having projections, would otherwise require a much larger
and more expensive machine than the actual grinding operation indicates.
It is a heavy, rugged machine made to the closest degree of accuracy,
special attention being paid to the design and construction of the equipment for
grinding both crankpins and main bearings to the most exacting requirements
for precision and finish.
GRINDING
MACHINE
2
23” x 3G" TYPE C HI-SWING GRINDER WITH LIVE SPINDLE HEADSTOCK AND SCREW TYPE FOOTSTOCK
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(
JIB CRANE
.*>~9
>
BELOW—REAR VIEW OF
MACHINE DESCRIBED ABOVE
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DRIVE
:
All machines are arranged for direct motor drive. Three motors are required;
one drives the grinding wheel spindle, a second drives the work and the third the table
traverse and pumps. •
BASE
As in all Norton machines, the base construction is an important feature. Not
only is the base casting massive, but the weight is correctly distributed to assure per
manent alignment and freedom from vibration. A stiff cross section is obtained by
thick walls and heavy ribs throughout. Ways for the sliding table and wheel slide of
large area, one flat and one vee, are hand scraped and lubricated by a pressure feed
system.
Bases for the 36" and 48" machines are constructed to rest on three points, the
72" machine requires a foundation and adjustable wedges are provided for maintaining
alignment.
Both the
coolant
and lubricating oil tanks are integral with the base.
TABLES
Like the base, the tables are stiffly ribbed and proportioned to support without
distortion the heavy work heads used for crankpin grinding. The low type of swivel
:
table used facilitates handling of work in and out of the machine.
HEADSTOCKS
Two types are available, one with a fixed spindle and dead center which is suit
able for grinding crankshaft line bearings or other work on centers, and one having a
live spindle for the convenient application of crankshaft workholders for crankpin
grinding.
Either type is motor driven by vee belts from the motor mounted on the head-
stock to a dutch shaft on which is fitted a brake for quick stopping. Starting and stop-
20" LIVE
SPINDLE
HEADSTOCK
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26" SCREW TYPE FOOTSTOCK
ping of the work revolution is controlled by a single convenient lever which operates
both the clutch and brake and permits the motor to run continuously. Work centers
are of hardened tool steel of large diameter and the headstock is firmly clamped to the
swivel table by two bolts in a manner to insure alignment and prevent distortion. The
faces of all drive plates or face plates are provided with tee slots for drive pins.
In the dead center headstock the drive plate revolves on the large and heavy
spindle which is tightly fitted into the headstock body. The drive from the clutch shaft
to the drive plate is by silent chain running in an oil bath. An adjustable idler main
tains proper chain tension.
The live spindle headstock has a spindle mounted'in large anti-friction bearings
and the drive plate revolves with the spindle. The same type of chain drive is used for
transmitting power from the clutch shaft to the drive plate. The face of the drive plate
26" LIVE SPINDLE FOOTSTOCK
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CRANKPIN GRINDING EQUIPMENT ON 23" HI-SWING GRINDER INCLUDING: HEADSTOCK WORKHOLDER WITH OUTBOARD
BEARING. FOOTSTOCK WORKHOLDER. WORKHOLDER ALIGNING BRACKETS, AND DIAL INDICATOR GRINDING GAUGES
FOR BOTH DIAMETER AND SHOULDER SIZING
is finished to run true and is provided with tee slots for drive pins and key slots for the
application of crankpin grinding workholders.
FOOTSTOCKS
Two types of footstocks are built, one with a sliding spindle and dead center and
the other with a live spindle revolving in anti-friction bearings. Both types are of ex
ceptionally sturdy construction and are clamped to the table by two bolts in the same
manner as the headstock.
The sliding spindle footstock is operated by a screw and hand wheel although
if preferred, a toggle lever can be substituted for moving the spindle. A hardened tool
steel center of large diameter is fitted to the spindle and provision is made for mounting
a diamond tool holder on the center.
The live spindle footstock is designed for the application of a crankshaft work-
holder to the large flange on the spindle. The face of the flange is machined to run per
fectly true and provided with large keys for driving the workholder.
15
WORKHOLDERS FOR CRANKPIN GRINDING
These are devices for holding the crankshaft in the right off-center position so
that the crankpin axis will be in line with the axis*of rotation of the headstock spindle.
m
6
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'
}
HEADSTOCK WORK HOLDER
WITH OUTBOARD BEARING
:
Workholders are available for mounting on the live spindle headstock drive plate and
on the flange face of the live spindle footstock. Both types carry crank holders which
are clamping devices for holding the crankshaft in the desired position.
The headstock workholder is made of an aluminum alloy to minimize the weight
and the outer end is supported by an outboard bearing clamped to the swivel table and
having adjustable bearing shoes. Footstock workholders are seldom used for grinding
radial engine cranks but are required when long cranks for in-line types of engines are
ground. The footstock workholder is usually quite short as it supports the short end
of the crank, no outboard bearing is required for the footstock workholder.
Locating brackets at both Headstock and footstock ends are used to align the
two workholders when a crankshaft is placed in the machine. Locking pins which slide
in the locating brackets fit slots in the workholders holding them in alignment while
the crankshaft is clamped in the crankholders. These pins are then withdrawn per
mitting the work to revolve with the workholders.
DETAIL—GRINDING BEARING OF
RADIAL ENGINE CRANKSHAFT WITH
SHAFT SUPPORTED ON CENTERS IN
HI-SWING GRINDER
7
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CRANKPIN GRINDING
Most designs of radial engine crankshafts require a workholder for the headstock
only, and if the machine is to be used exclusively for grinding the crankpins of such
shafts a footstock is not required. If, however, the end of the crankpin is centered or
chamfered it may be desirable to use a screw type footstock to support this end. Such
an
arrangement supplemented with a center point fitted to the workholder flange in a
position to contact the centered end of the shaft nearest the headstock, makes
ceptionally rigid support for maintaining accurate alignment of the crank while the pin
is being ground.
an ex-
FLANGE GRINDING
Faces of flanges can be ground perfectly flat and square with the crankpin in the
same set up by using the edge of a wheel having slightly tapered sides to provide relief
and reduce the area of contact between wheel and work.
GRINDING BEARINGS, TAPERS, ETC.
Other than crankpin grinding operations can be accomplished in the Hi-Swing
including
all
the cylindrical grinding on the crankshaft. When
the volume of production
TYPE
C
HI-SWING GRINDER WITH LIVE SPINDLE HEADSTOCK AND SCREW TYPE FOOTSTOCK
t
ih
is such that separate machines for crankpin and other grinding operations would not
be kept busy, these various cylindrical grinding jobs can be done in the same machine as
the crankpins by removing the workholders and using the regular centers in headstock
and footstock. In some cases main bearings can be ground on radial engine cranks with
out removing the large headstock workholder. A center point fitted to the front of
the workholder directly below the work clamp and in line with the headstock spindle
ax is is
footstock center. The crankpin serves as a driver by occupying a position, in the work-
holder clamp. If cranks are to be
purchased be of ample length.
designed that they may be accurately re-located. Workholder flanges are dowelled and
keyed to spindle flanges and the steel ring of the headstock workholder which runs in
the outboard bearing is ground round and true when the workholder is first mounted
and aligned. These surfaces, therefore, with dowelled location provide very convenient
means for re-location and alignment, and truth of running can be checked with an in
dicator.
used to support one end of the shaft bearing while the other end is carried on the
ground
In case workholders must be removed for grinding work on centers, thev are so
in
this manner it is important that the machine
8
9
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RIGHT HAND END VIEW 23" TYPE
HI-SWING
'
WHEEL FEED, HAND AND AUTOMATIC
A hand-operated grinding wheel feed which indexes to tenths of thousandths of
an inch is provided on all machines. The feed operates through a large diameter feed
screw
and half nut which are lapped together. This combination is virtually a large,
accurate micrometer so generous in its proportions that it will retain its accuracy for the
entire life of the machine. Ease of action is assured by the feed screw being mounted in
ball bearings. The screw runs in an oil bath, thus providing continuous lubrication.
For
traverse grinding operations feed of the grinding wheel is automatic at each
reversal of the sliding table. Automatic feed on plunge cut operations can be had by
means of continuous cross feed attachments
available as
extra
equipment.
POWER WHEEL HEAD TRAVERSE
An attachment is also available providing fast power traverse of the wheel head.
This device is very convenient when grinding cranks with several crankpins or where
large differences in diameters or projections between, make it necessary to move the
wheel head in and out a considerable distance frequently.
TABLE TRAVERSE
Power traverse of the sliding table is by means of a rack attached to the under
side of the sliding table engaging a pinion operated through a gear reduction and re
versing mechanism. A handwheel is provided for manual operation. The reversing
mechanism consists of a clutch which engages first
and then the other of two bevel
one
1
-4
0
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11
pinions on
pinions are
opposite sides, of and continually in mesh with a bevel gear. Clutch and
made of an alloy steel and the clutch teeth are hardened.
Power
for driving the table traverse is through a speed change mechanism com
prising a cone pulley and gear box. The drive to the cone pulley is by flat belt from an
anti-friction backshaft. Changes in speed are easily and quickly made without stopping
the work, wheel or table.
GRINDING WHEEL UNIT
The grinding wheel unit is completely self-contained. The great weight of the
complete unit and the large spindle supported in long bearings which can be closely
adjusted are responsible to a large degree for the superior quality of finish obtainable.
WHEEL SLIDE—The heavy wheel slide is of the compound type and moves on
long, broad and widely separated ways, one flat and one vee shaped, lubricated by the
same force feed oiling system as the table ways.
WHEEL SPINDLE—The wheel spindle is made from carefully selected and
heat treated alloy steel. It is very large and heavy and runs in long, bearings widely
separated. Both ends of the spindle are tapered, one taper nose receives the grinding
wheel on its balancing sleeve and the other the vee belt sheave for the drive from the
motor.
WHEEL SPINDLE BEARINGS—Are made of hard bronze tapered on the
outside for adjustment to compensate for wear. End thrust of the spindle is positive
and is distributed over a large area by a special design of thrust bearing. Bearings are
flood lubricated from a geared oil pump driven directly from the spindle itself. The flow
of oil is visible through glass windows in the wheel slide.
►
REAR VIEW
—23" x IR" TYPE C HJ-SWING GRINDER WITfl GENERATOR FOR D.C. HEADSTOCK MOTOR
Page 11
12
WHEEL SPINDLE DRIVE—The drive is through multiple vee belts from a
;
motor mounted on the wheel slide. The motor rests on a sliding base for the convenient
adjustment of belt tension. No idlers are employed. Changes in the spindle speed are
accomplished by simply changing
;
speeds
are available and a safety device prevents the use of excessive wheel speeds.
sheave
pulleys on the end of
the
wheel spindle. Three
COOLANT AND OIL PUMPS
A
compact and powerful coolant impeller type pump is mounted directly on the
rear of the machine and driven from the backshaft.
A second pump of the geared type is also driven from the same shaft and supplies
oil for the pressure-flood lubrication of the wheel slide, table ways and feed screw.
ELECTRICAL EQUIPMENT
Motors are not included in machine prices. Norton Company will quote on
electrical equipment if informed as to the current available. Complete specifications
of
motors to be furnished by customers should accompany orders for machines. Unless
RADIAL WHEEL TRUING DEVICE FOR HI-SWING GRINDERS
i
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GRINDING CRANK PIN OF RADIAL ENGINE CRANKSHAFT ASSEMBLY IN 20" TYPE C HI-SNVING. TABLE TYPE DIAMOND
TOOL HOLDER IN FOREGROUND
otherwise stated, all motors specified are plain bearing open frame motors. If fan cooled
motors with enclosed frames are to be used, it will be necessary for customer to send cer
tified dimension sheets for checking to be sure no interference would prohibit their use.
Where no direct current is available for adjustable speed headstock motors,
generators may be used and mounted on the machine.
All motors should be mounted at our factory ip order that they may be exactly
fitted and their rotors carefully balanced to eliminate vibration. Headstock motors,
without exception, must be mounted at the factory and should be received at least
two weeks before the scheduled date for shipment of the machine.
MACHINE EQUIPMENT AND ATTACHMENTS
Because of the great variety of work for which these machines are adapted
there is no fixed standard equipment. Those mechanisms and attachments required
for the work to be done are selected from a very complete line.
A wide variety of optional or auxiliary equipment is available, including head-
stocks, footstocks, wheel guards, wheel sleeves, wheel truing devices, center pointing
device, steadyrests and work drive dogs. Also special crankshaft grinding equipment
headstock crank workholder with outboard bearing, footstock crankpin grinding drive
plate with crank holder, extra crank holders, special heavy duty live spindle head-
stocks, table locating device, work aligning brackets, jib crane and adaptor for handling
grinding wheels, grinding gauges, etc.
—
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14
23"
and
26" T
ype
SPECIFICATIONS
C
Hi-S
wing
C
rankshaft
G
rinders
Note: Machine lengths are determined by the capacity between centers when machines arc equipped
with regular headstock and footstock. Hence the nominal length does not indicate the length of
crankshaft that can be accommodated in workholders. Actual capacity for crankpin grinding depends
on the crankshaft and equipment and can only be determined by an engineering study.
CAPACITY
Nominal diameter swing
Nominal lengths between centers
Actual maximum swing over table
Distance between wheel and work centers:
Maximum
Minimum
Maximum diameters that can be ground with:
20" diameter grinding wheel
24"
........................................................................................
30"
........................................................................................
36"
........................................................................................
Maximum widths of grinding wheels:
20"x 7"
Steadyrests, maximum work diameter accommodated
Swivel Adjustment for grinding tapers
Machine lengths
Taper per foot on diameter
...........................................................................
...........................................................................
24"x 5"
...............................................................
...................................................
..................................
................................
.........................................
30"x 4"
36"x 3".................
...........................................
23"
36" 48" 72"
23^"
23"
W'
23^"
22"
16"
10"
6^"
36" 48" 72"
&A" 2" 1%"
2G"
36" 48" 72"
26tV'
23"
9 A"
26"
22"
16"
10"
36" 48" 72"
2M" 2" l%"
HEADSTOCKS
Spindle diameter, live spindle headstock
dead center headstock
Center diameter
Length of bearing on table
Minimum work speed range (690/2660 R.P.M. motor)
Note: Higher speed ranges can be provided when required
Net weight with \Al
...................................................................................
..............................................................
H.P. motor
..................................................
........
Qi_3//
°16
SVs"
2"
20 y8"
18/69 R.P.M.
1500 lbs.
3if"
3
2"
20
18/69 R.P.M.
1580 lbs.
FOOTSTOCKS
Spindle diameter, Screw or lever type, sliding spindle
Live spindle type
Center diameter
Length of bearing on table, all types
Net weights, Sliding spindle type. . .
.....................................
Live spindle type
.................................
...........
BASE WAYS
Width each way (one flat and one vee)
Overall width of ways
Lubrication—Automatic pressure feed
..............................
TABLE TRAVERSE
Number of traverse speeds
Speed range—inches per minute
........
3 Vs"
3H"
2"
15"
275 lbs.
380 lbs.
2 A"
14 A"
16
10"—148"
3 Vs"
3 K"
2"
15"
295 lbs.
400 lbs.
*A±"
14%"
)
16
10"—148"
«
7
Page 14
WHEEL FEED
Diameter of feed screw
Minimum diameter reduction by wheel feed index, English..
.....................................................................
Metric.
15
3J4"
.0001"
.
.0025 mm.
s'A"
.0001"
.0025 mm.
WHEEL SPINDLE AND BEARINGS
23" and 26"
Material—Heat treated alloy steel
Spindle length
Spindle bearings
Material—hard bronze
Large bearing
Small bearing
Spindle speeds
Drive—multiple vee belts from motor
Lubrication
......................................
..................................
..................................
......................................
Automatic Flood
3 5%"
3M" x 8Vs"
3
x 7*"
Length of bearing ways
Width of flat way
Width of vee way
Projected area bearing on ways.
Overall width of ways
Total approximate weight of
2
slide, complete with interme
diate slide, grinding wheel,
guard, motor, etc
WHEEL SLIDE
................
............................
............................
....................
.........................
23" and 26"
...........
..............
..................
.
23"—2300 lbs.
26"
MOTORS
Wheel drive—10, 15 or 20 H.P., 1800 R.P.M. constant speed A.C. or D.C.
Note—when 36" diameter grinding wheels are used motor must be 10 H.P., 1200 R.P.M. constant
speed A.C. or D.C.
Work Drive—\A H.P. 690/2660 R.P.M. adjustable speed D.C.
oy
\ A
H.P. 850/2550 R.P.M. adjustable speed D.C.
Table traverse and pump—*3 H.P., 1200 R.P.M. constant speed A.C. or D.C.
Generator for headstock motor when D.C. is not available—2 KW., 1750 R.P.M.
*When generator is used increase to 5 H.P.
FLOOR SPACE
Length machine—23" and 26"
Overall projected length.
Overall projected width
...........
36"
1
1'-8"
6'-4"
48"
13'-8"
6'-4"
33H"
5^"
5"
352 sq. in.
17"
—2375 lbs.
72"
17'-8"
6'-4"
SHIPPING SPECIFICATIONS
(approximate)
Note—Because of variations in castings and equipment, exact weights cannot be given. Weights
listed are for machines with average equipment including: headstock with workholder and outboard
bearing and screw
23" machine
Net weights
Domestic shipping weights
Export shipping weights...
Cubics, boxed for export.
26" machine
Net weights
Domestic shipping weights
Export'shipping weights...
?
Cubics, boxed for export. .
THE DESCRIPTIONS. ILLUSTRATIONS AND
type footstock. Motors are included. Weights are in pounds, cubics are in cubic feet.
36"
...........................
.
............................
SPECIFICATIONS IN THIS BOOKLET ARE CORRECT AT THE TIME OF PRINTING.
machines built at later dates may differ in detail due
NORTON COMPANY TO CONSTANTLY IMPROVE T6EIR MACHINES
13.700
15,300
16.700
600
14.200
15,800
17.200
600
48"
14,700
16,400
17,900
635
15,200
16,900
18,400
635
TO
THE POLICY OF
72"
16,700
18,800
20,400
705
17,200
19,300
20,900
705
Page 15
if
NORTON MACHINES
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. $
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¥
II
CYLINDRICAL GRINDING MACHINES
ROLL GRINDING MACHINES
'
UNIVERSAL TOOL AND CUTTER GRINDING MACHINES
UNIVERSAL MULTIPURPOSE GRINDING MACHINES
CAMSHAFT AND CRANKSHAFT LAPPING MACHINES
ATTACHMENTS AND EQUIPMENT FOR SPECIAL WORK
NORTON COMPANY, WORCESTER, MASS., U.S.A.
Branch Offices—H
ARTFORD, NEW YORK, CLEVELAND, DETROIT, CHICAGO
CAR WHEEL GRINDING MACHINES
SURFACE
RUNNING BALANCE INDICATING MACHINES
CRANKPIN GRINDING MACHINES
AUTOPART REGRINDING MACHINES
CYLINDRICAL AND FLAT LAPPING MACHINES
GRINDING MACHINES
.
LONDON
CABLE ADDRESS; "NORCO
FORM 4I4-3P-8-38-1500 PRINTED IN U.S.A.
”
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i
GRINDING MACHINES
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