Page 1
1
MODEL
1
D
for Crushtrue
brasive Machining
grinds multiple diameters
and forms
up to 6 inches wide
or spaced forms
up to 9 inches wide
in one operation.
Page 2
I
187
MODEL
MULTIFORM GRINDER
AUTOMATIC
FEATURES
Of modular design, the #
different models to accommodate a wide variety of applications rang
ing from grinding steel rod mill rolls to small precision automotive,
aircraft and missile components. It can be tooled for completely
automated production as well as for hand feeding.
All the advantages of abrasive machining at its best are possible
with this machine and the Crushtrue wheel dressing process. Materials
including stainless steel, brass, aluminum and plastic can be formed to
exacting tolerances and surface finishes. Simple or intricate forms are
produced at cost saving, high stock removal speeds.
The machine incorporates many new and unique features not found
in any other grinder.
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1 s/
187
Multiform Grinder is available in four
:
1
S’C1!' ; V & as
• Hydraulic feed with adjust
able positive stop.
•
Automatic plunge grinding
with rapid approach and re
traction of grinding wheel.
• Automatic infinitely variable
feed of wheel into work.
• Automatic spark-out or dwell
time.
• Automatic sizing device con
trols work size during grinding.
(Optional)
• Automatic compensation for
wheel wear due to grinding and
dressing. (Optional)
Page 3
EXCLUSIVE DESIGN FEATURES
Wheelhead Assembly
The complete wheelhead assembly is mounted on hardened
flat steel ways efficiently lubricated by an oil mist system which
is part of the assembly. A unique feature of the wheelhead is
the grinding wheel spindle which is of the “dead”
The grinding wheel rotates on precision roller bearings which
provide maximum support during grinding and wheel dressing.
The massive dead shaft design provides rigidity and accuracy.
Infeed of the wheelhead is powered by a hydraulic system
that provides unmatched smoothness and precise automatic
control.
a 9" width can be accommodated by the wheel spindle.
Solid 6" wide wheels, or narrower wheels spaced to
shaft design.
Workhead
The heavy duty live center workhead is driven by a precision
balanced, 2 horsepower variable speed D.C. motor, giving
infinitely variable work speeds from 39 to 780 R.P.M. This
wide
range assures the selection of proper R.P.M. of the
workpiece for optimum stock removal rates.
Standard collets up to 2!4"
chucks can be accommodated on the #8 American Standard
taper spindle nose.
diameter and standard work
Taifstock
The tailstock assembly is of rigid construction incorporating
an air operated quill. A Pressure Regulator
pressure of the center on the workpiece. Removable centers
have
No. 11 B and S tapers.
provides for
correct
Platen
The platen, on which the workhead and tailstock are mounted,
will accommodate workpieces up to 10" in diameter and 24"
in length. The top of the machine base provides an accurately
scraped surface on which the platen is mounted, with clamp
screws securing the platen at both ends.
A center pivot-point in the platen allows for an angular
adjustment of 5° counterclockwise and 2° clockwise.
An annular setting device, gage block type, can be supplied
accessory for fast, accurate positioning of the workpiece
as an
in
relation to the grinding wheel.
Crushtrue Wheel Dressing
The Crushtrue Wheel Dressing Device is mounted directly be
hind the grinding wheel and is an integral part of the machine
base. The same precise hydraulic infeed system that feeds the
wheel during grinding also feeds the wheel in the reverse direc
tion
during Crushtrue wheel dressing. This simple operation
— forward to grind and reverse to dress — reduces the time
cycle
and allows maximum productivity of the machine. A
variable speed electric drive controls the hydraulic feed during
wheel dressing.
Controls
An eye-level height control panel contains all of the operating
controls of the Model 187 Grinder. The panel is mounted on
a post which can be pivoted for ideal viewing and accessibility.
Functional grouping and large panel identification plates con
tribute to ease of operation. Settings for grinding and crushing
cycle rates, indicating meters and warning lights are all ar
ranged for the convenience of the operator. Handwheels to set
the machine for the depth of grind plus the slow-feed grinding
distance are both located on the front of the machine.
4 3 1 my
1
95119
MiJ
w
-----------
Figure 7
Crushtrue Device
M V
19111
*391
Figure 8
Control Panel
J 9
y
=
Hydraulic Infeed System
Both the grinding and the Crushtrue Wheel Dressing opera
tions are powered by the same smooth, precise hydraulic infeed
system. Located at the rear of
for maintenance, this specially designed system is superior to
any other for precision annular grinding.
the machine and easily accessible
Electrical Panel
At the rear of the machine an electrical panel contains all of
the necessary switches, relays and D.C. power equipment for
operation of the machine.
Page 4
Figure 9
TYPICAL
Steering Knuckle
Operation:
Tolerance:
Material:
Grinding Time: 2 minutes
Production:
Crushing Data: 40 parts per crush dressing
Turbine Nozzle
APPLICATIONS
Finish grind thread diameter,
thread relief and end chamfer,
semi-finish bearing diameters
and blend at knuckle face.
±.001 on diameter
Steel forging
30
pieces per hour
7W
I
I
\
m/
Figure 10
Figure 11
Operation
Tolerances
Material
Grinding Time 16 minutes (for .600 depth)
Production
Crushtrue Data 15 pieces per Crush Dressing
Finish grind all cast O.D. contour
surfaces maintaining all radii,
outside diameters, lateral
dimensions and
± .0025 on 12" diameter
Inco—713
3 pieces per hour
50 dressings
per
finish.
roll
regrind
Piston Shoe
Operation
Tolerance
Material
Grinding Time 30 seconds
Production
Crushing Data 50 pieces per Crushing
Finish grind
diameter and thickness,
chamfer all corners, and blend
radii from
workpiece.
± .0000, —
diameter,
sphericity, ± .001 on shoulder
diameter and thickness.
52100
ball diameter, flange
a preformed
.0005 on ball
.0002
steel
96 pieces per hour @ 80%
on
ball
1%"-
I
W'
Figure 12
Cast Rotor
Operation:
Tolerance:
Material:
Grinding Time: 5 minutes
Production:
Crushing Data: 45 pieces per crush.
Finish grind from casting
establishing three diameters,
three shoulders, ring groove
and thread relief.
±.0001 on two diameters.
Stellite
12 pieces per hour
45/a"
r
Page 5
MODEL
187 SPECIFICATIONS
Four variations are available to suit specific
job requirements.
Model 187 A
This model is the basic machine without the platen,
workhead or tailstock. Special tooling can then
be applied as on a fully automatic single purpose
machine for grinding one type of part.
Model 187 B
The model described and illustrated in this brochure
is the Model 187 B.
Maximum length
Maximum diameter
Work
Capacity
Minimum diameter
Maximum swing diameter
Maximum Form Depth
Maximum
—
with spaced wheels
Form Width
Model 187 C
This model is identical to the Model 1S7 B except
for the addition of a worktable having the conven
tional lateral movement.
Model 187 D
Model 187 D is identical to Model C except for an
increased capacity for work diameter and length.
This model has a maximum part length capacity
of 68
V&" and a maximum part diameter capacity
of 13". The wheelhcad motor is also increased to
30 h.p. to handle the added load requirements.
ABC
24"
10"
.
ll3/4"
1"
6"
9"
'
D
681/2
13"
3"0"
14"
1"
6"
9"
"
Grinding
Wheel
Machine
Electrical
Maximum
Minimum diameter
Maximum width
Hole diameter
Minimum wheel width
Maximum width of spaced wheels
(Note: Special crusher housing and wheel adapter required.)
Standard wheel speeds RPM
Standard 24" wheel SFPM
Work speeds RPM
Maximum wheelhead adjustment
Wheelhead rapid travel range
Minimum-maximum
Maximum wheelhead automatic feed
Maximum wheelhead infeed rate
Maximum wheelhead infeed rate
“
Crushtrue”® feed range
Tailstock center taper
Platen swivel adjustment
Wheelhead motor (prec. bal.)—Standard
Optional wheelhead motors
Workhead motor (prec. bal.) D.C.
Slow wheel crush speed motor—Standard
Coolant pump motor
Rapid traverse pump motor
Slow feed pump motor—(Statotrol)
diameter
24"
20"
;
no
6"
12"
1"
9"
1122
7000
39 to 780 20 to 185
7"
24"
20"
6"
;■
12"
1"
9"
7"
IV2"
1"
Standard .005" to .475" per min.
Optional .085" to 8V2" per min.
.004" to .075" per min.
No. 11 B & S
2° clockwise, 5° counter-clockwise
15hp
20-30hp
2hp
3
A hp
3hp
3hp
Vz hp
1"
30hp
no
2hp
3/4
3hp
3hp
%hp
iy2"
hp
!
Page 6
Sheffield Crushtrue
Form Grinding is fast
accurate
, wersafii
@ a
,
O D
The Model #187 Grinder is built from the ground up to
give you the maximum advantages of abrasive machining
from the Crushtrue grinding process. It handles a wide
range of parts such as servo valve sleeves, sliders, pistons,
ball joint spheres, circular form tools, aircraft and missile
components.
Crushtrue form grinding is much faster, cooler, than
grinding with diamond dressed wheels. You get these im
portant advantages:
• MORE WORK PER WHEEL-HOUR because the CRUSH-
TRUE-dressed wheel has many more sharp cutting points
than diamond-dressed wheels. Free cutting action allows
efficient use of coolant, more stock removal per revolution
and more parts per dressing.
• FORMS COMPLEX CONTOURS in one operation with high
concentricity and close lateral tolerances.
• MATERIALS ARE NO PROBLEM, whether grinding stainless
steel or "heavy loading" metals and plastics. With CRUSH-
TRUE grinding there are no burn spots or loading.
• ACCURACY as close as .0002" width tolerance, radial
depths within .001", depending on material, stock removal,
and wheel used. Straight sides of grooves or shoulders can
be held to within .0003", keeping a sharp corner at the
bottom of deep grooves. Surface finishes as fine as 8 micro
inches can be CRUSHTRUE ground.
• FASTER REDRESSING—When wheel wear approaches part
tolerance limits it is redressed in a matter of seconds by
automatic or manual means.
• ELIMINATES DEBURRING—Wheel can be “
around the part,
corner break.
” leaving no burr, and a very uniform
wrapped
In addition, this grinder enables you to set up automatic
grinding and wheel dressing cycles suitable for practically
any part within the size range of the machine. You get the
benefits of quick, easy set ups for short runs, as well as
maximum production on large lots.
If you require maximum automation, Sheffield will engi
neer and build the necessary automatic size control, auto
matic loading and unloading, and integration of the grinder
With the Sheffield CRUSHTRUE dressing process, a formed
steel or carbide roll having the same profile as desired in the
workpiece is fed into an abrasive grinding wheel until the
wheel takes the reverse form of the roll.
Diamond Dressed
* A
f
X
The deeper voids in Crushtrue dressed wheel
allow more coolant flow between wheel and work
and provide larger chip spaces.
Figure 13
*
Figure 14
Crushtrued
SHARP
x*
* %
r *
with other production machines, to meet your requirements.
i
The
SH
Corporation
A subsidiary of The Bendix Corporation
Inspection Gages, Dimensional Control Instruments, Machine Controls, Automatic Gaging & Assembly Systems. Measuray? X-Ray Thickness Measuring
Crushtrue® & Multiform® Grinders, Cavitron® Ultrasonic Machine Tools, Press-Pacer® Transfer Units, Large Dies. Tooling. Contract Manufacturing.
i]
I
LD
Day ton 1, Ohio
Arrange for a demonstration at our Dayton plant and see
for yourself the advantages of abrasive machining with
the Model #187 Grinder.
CATALOG NO. 187 MG-963
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