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HARTFORD. CONN. 06103
:
Phone: 525-3100
DISTRIBUTOR
A AUSTIN-HASTINGS CO., INC.
11 FORBES ROAD—Route 93, near 128
14 HAYNES ST.
WOBURN, MASSACHUSETTS 01801
Phone—(617) 9354600
318 SHREWSBURY ST.
WORCESTER. MASS. 06104
Phone: 756*2415
LANDIS
LANDIS TOOL COMPANY, WAYNESBORO, PA.
■;
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Lfflil
iliviHl
r 0 plain or universal
r-
3
ir -i*T
1
Available as 6" x 18" Type 1R Plain, or 10" x 20" Type 1R Universal
Page 3
1R PERFORMANCE
LANDIS 1R GRINDERS WILL
■
grind
■ hold size to less than 50 millionths
■
grind
round to less than 25 millionths
to
less than two micro inch finish
1R VALUE
NO COMPROMISE IN LANDIS QUALITY
■
manufactured
conditions and quality controls as all
Landis grinders
under the same exacting
■ same features, quality and reliability as in
i
all Landis grinders
■ easy maintenance because there are no oil
cups or grease fittings on 1R grinders
I-
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Page 4
he need for an economically priced grinding
X
machine designed to enable any shop to fin
ish metal parts consistently within millionths
of an inch is being met by the new Type 1R
cylindrical grinder.
The precision, repeatability and versatility of
the machine have already been demonstrated
in hundreds of shops, producing a great va
riety of machine parts and components, in
small job shop lots and large production runs.
Type 1R grinders are available as a 6" x 18"
plain machine or as a 10" x 20" universal
model. The standard version of the machine
is hand operated but it can be provided with
hydraulic traverse, hydraulic infeed, or both
in
combination. Additional equipment such
as internal grinding attachments, work rests
and various types of chucks also can be
supplied.
Construction features of all machines include
Hard Film Microsphere wheel spindle bearings
that are guaranteed for the life of the machine,
a preloaded ball sleeve footstock that is shake
free, and a precision built live spindle head-
stock which assures roundness and accuracy.
A “
usual
No-Float
carriage stability and there is an auto
” lubrication system gives un
matic lubrication system for the wheel spindle
bearings that incorporates a separate pump,
reservoir and pressure switch protection.
The large number of Type 1R grinders supplied
to
industry since their introduction have proved
by their performance records that Landis
claims for accuracy, reliability, repeatability
and versatility have been substantiated. This
will be apparent from these case histories.
Examples will particularly stress the versatility
of this line of grinding machines.
2
’
Page 5
Wide variety of parts
Figure 1. Repeatability of performance is a noteworthy characteristic
of this IR grinding machine in a shop that produces high
precision parts for aircraft and other applications.
ground in siiops that
serve the aircraft industry
Critical high precision components for aircraft
and other applications are ground on the Type
1R plain grinder shown in Figure 1 which is
installed in the shop of the Bachan Manufactur
ing Co., Madison Heights, Michigan. The ma
chine is engaged in grinding an aircraft bearing
block such as shov/n as part 1 in Figure 2.
After this part has been ground to a specified
size, it is chromium plated to a thickness of
0.0045" and then reground to 1.6251" within
0.0003". The total grinding time in obtaining
a finish of 10 micro inches is 2Vz minutes.
Despite difficulties of grinding a hard chro
mium plating, the grinding wheel need be
dressed only at intervals of approximately 120
pieces of work. Incidentally, an interrupted cut
is involved in grinding
Part No. 2 also involves an interrupted cut. It
is plunge ground to a tolerance of 0.005" and
a finish of 32 micro inches in 10 minutes,
0.060" of stock being removed. Part No. 3 is
a ring with a central groove that
within 0.0001", stock to a depth of 0.002"
being ground off. A surface finish of 10 micro
inches is specified. The grinding time on this
piece was reduced from 5 minutes to 3 minutes
by assigning the job to the 1R grinder.
this
part.
is
finish
ground
Figure 2. Typical components ground on the machine in Figure 1.
Examples 4
stages of the grinding. In the second opera
tion, chromium plating is removed to a depth of
0.0005" within a dimensional limit of 0.0003".
Four pieces are mounted together on an arbor
for simultaneous grinding.
Part No. 6 presented a special problem in
grinding the formed groove between the two
larger end diameters. To solve this problem
the company made a special dresser that forms
the face of the grinding wheel suitably for grind
ing the groove. Whereas it formerly took from
3 to 4 minutes to grind the part to a surface
finish of 32 micro inches, the operation is
accomplished within 2Vz minutes on the 1R
machine.
and 5 are the same
part
at
different
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Page 6
MULTIDIAMETER
SHAFTS
Repeatability to close tolerances is considered
by the Acme Gear Co., Englewood, N.J., to be
the most important requirement of a cylin
drical grinding machine. This concern sup
plies original equipment for machinery such
as printing presses and also produces aircraft
components. Typical parts ground on a 1R
plain grinder in this plant are illustrated in
Figure 3. Four different diameters on the pinion
shaft at the lower right, including the tops of the
pinion teeth, are ground to specifications within
limits varying from ±0.00025" to ±0.0025".
Roundness is held to a limit of less than 20
millionths of an inch. The operation on this
pinion shaft is shown in Figure 4.
The part is made from AISI 4260 steel. From
0.010" to 0.015" of stock is left on the various
diameters in previous operations for removal
by grinding. Production lots range up to 500
pieces. The hydraulic traverse and hydraulic
infeed provided on this machine facilitate re
peatability piece after piece. In-process gaging
has not been found necessary.
HELICOPTER PARTS
Critical helicopter parts are consistently fin
ished to a high degree of accuracy on a Type
1R universal grinder in the plant of the J.
Soehner Division of the Kinemotive Corpora
tion, Long Island, N. Y. A typical part is a 3"
diameter hollow pin 8" in length which is shown
in rough and finish stages in Figure 5. Three
diameters on this part vary in steps of 0.010"
from one end of the pin to the other. These
diameters are held to tolerances of 0.0007"
and the concentricity of the several surfaces
with respect to each other is held to 0.0005".
Straightness must be within 0.0002".
About 0.015" of stock is removed in rough
grinding and from
grind. Surfaces A and C are rough ground at
the rate of 30 pieces per hour and finished at
the rate of 25 parts per hour. Surface B, which
is 4%" long, is rough and finish ground at the
rate of 4 parts per hour. The pin is made of
high tensile stainless steel.
4
0.001"
to
0.002"
in
the finish
Figure 5. Hollow pin for helicopter service on which three diameters
are ground within tolerances of 0.0007". Straightness is
held to 0.0002" and concentricity of cylindrical
surfaces to 0.0005".
Page 7
Gears, shafts and other parts for aircraft ap
plications are consistently ground to a tolerance
of +0.0005" on a 1R plain grinder in the plant
of the Clipper Gear & Machine Co., Roseville,
Mich. Typical parts are shown in Figure 6. A
rather unique valve part on which two diameters
are ground in one setup is indicated by the
arrow. Thousands of this high precision part
are ground at the rate of 50 to 65 pieces per
hour. In one test run of 650 parts, size v/as
held within 0.0001" on all pieces without any
rejects. In regular operations, the grinding
wheel is dressed after finishing each batch
of 60 pieces.
Figure 6. Gears, shafts and other parts that are consistently ground
to close tolerances on a Type 1R plain grinder.
Another part precision ground in this shop is
an output shaft assembled in the mechanism
of a variable pitch propeller. The shaft is made
of AMS 6260 steel and is heat treated to a
hardness of Rockwell C-40. Two diameters are
ground in one loading by applying the plunge
grinding technique. The larger diameter is
nominally 3.480". It is ground within a tolerance
of +0.0005"
inches. The smaller diameter is ground to
1.386" and to a surface finish of 32 micro
inches. The tolerance is also +0.0005". From
0.012" to
surface. Production is at the rate of 60 pieces
per hour. The number of individual parts in
spected for size and roundness on an ampli
fier type of gage depends upon the total quan
tity of the lot. Repeatability 2nd precision of
the grinding machine have eliminated rejects.
and to a surface finish of 63 micro
0.015"
of
stock is removed from each
COMPUTER SPOOL
A complex plunge and traverse
tion on a stainless steel computer spool shown
in Figure 7 is an example of work performed
on a 1R universal grinder
turing Co., Inkster, Mich. Three diameters are
plunge ground and there
cut. Diametral tolerances are held to ±0.0003"
in the removal of 0.010" of stock. Production
runs 15 or 16 pieces hourly.
grinding
at the Park Manufac
is
then a final traverse
opera
Figure 7. Checking a computer spool that is both plunge and traverse
ground to diametral tolerances of :±-
0.0003".
The hydraulic infeed on the 1R is lever con
trolled, providing a rapid infeed, slow grinding
feed and sparkout. The rate of plunge feed is
adjustable through a dial control. The rate of
traverse, as on all machines equipped with the
hydraulic traverse, is infinitely adjustable from
2 to 240 inches per minute, also by means of
a dial control. The hand traverse is disengaged
when the power traverse is put into use.
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IS? grinders handle wide
variety of electric
motor shafts
Shafts of many different types are produced
in the plant of the Doerr Electric Corporation,
Cedarburg, Wis., for application in the electric
motors manufactured by this concern. These
motors are supplied to companies that make
hoists, power tools, air compressors, pumps,
textile, food-processing and woodworking ma
chinery, machine tools, and other industrial
equipment. So many types and
designed motors are produced that there is
hardly such a thing as a standard shaft. In
fact, the problem of grinding shafts varying
from Vz" to IV2" in
each to close-tolerance diameters, required
considerable ingenuity in deciding upon
ing system that would economically meet high
quality specifications.
Two 1R plain grinders equipped with hydraulic
traverse and hydraulic infeed meet
situation. Parts are ground on this equipment
within the required ±0.00015". The hydraulic
traverse especially helps the machine operators
to grind the large family
many different diameters. There
reversal for precise traverse grinding. A typical
operation in this plant is illustrated in Figure 8.
diameter and to 20" in length,
sizes
of
this
of
motor shafts to the
is
a
cushioned
specially
a grind
special
Figure 8. One of two 1R plain grinders used by a manufacturer of
electric motors to finish a wide variety of shafts.
Motor shafts and spindles of infinite variety are
also produced by the Milwaukee Electric Tool
Corporation, Brookfield, Wis. A few of the more
than fifty shafts and spindles ground to close
tolerance on a 1R plain grinder are shown in
Figure 9. In an operation that is automatic
except for loading and unloading, from 60 to
125 pieces are ground per hour. Diameters
are ground to their specified tolerance of
±0.0001" and round within 0.0001". Surface
finish is 16 micro inches or better. Each piece
of work is checked 100 percent by both the
machine operator and personnel of the in
spection department.
6
Figure 9. More than fifty different shafts and spindles similar to these
are ground in the shop of another motor manufacturer
to close tolerances specified for diameters and roundness.
Page 9
Oages ground within
millionths of an inch
Figure 10. Grinding a gage to size within 50 millionths of an inch
and to a surface finish of 2 micro inches.
Gages that are accurate within 0.000050" and
having a surface finish as fine as 2 micro
inches are produced by a Type 1R universal
grinder installed in the shop of the Phoenix
Gage Co., Phoenix, N. Y. This company operates
a custom shop that specializes in close toler
ance prototype work and precision machine
parts. As many
handled daily on the 1R grinder. A typical
operation is illustrated in Figure 10. Many
parts are of complex construction and the fact
that they can be handled by this machine is a
tribute to the
Tungsten carbide plug gages for the ball
bearing industry, which constitute a principal
product of the H. W. Wagner Co., Stamford,
Conn., must be produced within extremely
close dimensional tolerances. Gages from Vfe"
to iy2" in diameter are consistently held to the
specified diameters and true roundness within
twenty millionths of an inch. Even gages 5" or
6"
in
diameter must be to size and round within
fifty millionths of an inch. Mirror-like finish,
usually to 2 micro inches, is specified for all
gages.
as
thirty different size parts are
versatility
of
the equipment.
Oo
O
Oo
Figure 11. Small size tungsten carbide gages for use by the ball
o
bearing industry are ground to specified diameter and
true roundness within 20 millionths of an inch.
All of these carbide plug
precision cylindrical parts, are ground on a 1R
universal grinding machine. The product dis
play board in Figure 11 gives an indication of
the variety of carbide tipped gages manufac
tured by the company, all to special order. It
will be apparent that interrupted cuts occur in
grinding many of these parts. Large gages
have carbide inserts spaced around their
periphery while smaller gages consist of a car
bide tip brazed to a long shank. The latter
types are made as small as
for inspecting miniature bearings. In grinding
large gages such as seen in the upper center
of the illustration, special care must be taken
during the manufacturing procedure because
of the different expansion coefficients of the
stainless steel center and the carbide tips.
gages,
0.047"
as
well as
in
diameter
other
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Page 10
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Oisttioi fools of many types mi sizes are ijmM on 1R maclilBies
Reamers, drills, burs, end mills and other
cutters are manufactured from solid carbide
by the Atrax Co., Newington, Conn. Three 1R
grinding machines equipped with hydraulic
traverse and hydraulic infeed are used in the
Claremont, New Hampshire, plant of the con
cern for
reamers. Solid reamers are regularly produced
in diameters from 0.1562" to 0.445" and in
lengths from 4" to 7".
All reamers are rough and finish ground. In
rough grinding, from 0.002" to 0.003" of stock
is left for finishing. Finish sizes are held to
within a few ten-thousandths of an inch. Fea
tures of the grinding machines adapt them to
convenient and easy setup of consecutive jobs,
according to the operators.
Figure 12. Reamers, drills, burs, end mills and other cutting tools
the cylindrical grinding of all chucking
are ground on three machines equipped with hydraulic
traverse and hydraulic infeed.
Reamers in great variety, ranging from 0.140"
to 1" in nominal diameter and from 2lA" to
9V2" in length, are regularly produced by the
Glenbard Tool Manufacturers Inc., Chicago,
III. Typical examples, all ground on six 1R
plain grinders, are shown in Figure 13. Depend
ing upon size and type, from 12 to 32 reamers
can be ground per hour accurately to specified
size within 0.0002".
Surface finish ranges from 10 to 15 micro
inches. Each reamer is finish ground in one
operation, a fact that has reduced handling
of work and eliminated machine resetting. It
is estimated that the use of the 1R machines
has reduced production time about 20 percent
in comparison with former rates.
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Page 11
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a
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Figure 13. Typical examples of reamers ground in another plant in diameters ranging from 0.140" to 1" and in lengths from 2TV' to 9lA"-
6"
Figure 14. Selection of multiple diameter punch components
ground in one of the largest independent tool and die
shops in the country.
I
Approximately 165 toolmakers in the plant of
the B. Jahn Manufacturing Co., New Britain,
Conn., are engaged in producing precision
tools, dies, jigs, fixtures, gages and special
machinery. Most finishing operations on cylin
drical parts are performed on a 1R plain grinder
provided with a power traverse and hand
infeed. Figure 14 shows a variety of punch
parts finished on the machine. All of the ex
amples have two or more ground diameters
with size tolerances to ±0.0001".
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Page 12
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