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Page 2
No.
2 Vertical
Lapping
Machine
FOR FLAT OR CYLINDRICAL
Norton vertical lapping machines are designed to produce flat or cylin
drical surfaces within extremely close tolerances and with a high degree of finish.
Such types of
by any other method than machine lapping.
The No. 2 machine herein described is a production machine constructed
to use cast iron laps in conjunction with loose abrasive with a suitable lubricant
or vehicle. Arrangements of the machine for flat or cylindrical work are slightly
different but in cases where both types of work are required and the production
is not sufficient to warrant the maintenance of two separate machines, an
attachment for cylindrical lapping can be furnished with the regular flat lapping
machine.
surfaces
and accuracy for size is unattainable on a production basis
WORK
•NO. 2 VERTICAL LAPPING
MACHINE ARRANGED FOR
LAPPING FLAT WORK
Page 3
DRIVE
All No. 2 vertical lapping machines are arranged for direct motor drive from a
single motor mounted on a bracket attached to the machine column. The drive is through
a silent chain from the motor to a drive shaft in the lower part of the machine base through
clutch control by a lever convenient to the operator.
With this arrangement it is not necessary to stop and start the motor in order to
stop the lap revolution.
BASE AND COLUMN
The base is a single casting of heavy construction which forms a support for the
column and houses the lower lap drive mechanism. The column is securely bolted to the
base and carries a heavy overarm which supports the upper lap, spindle and geared raising
mechanism.
UPPER LAP AND SPINDLE
The upper lap and spindle are supported by the overarm, the spindle being raised
or lowered manually by means of a geared raising mechanism on the overarm. A tripod
or three-arm bracket to which the upper lap is bolted is fastened to the upper lap spindle
by a floating connection which enables the upper lap to adjust itself to any slight deviation
from parallelism with the lower lap, such as might be caused by irregularities in the work
before lapping.
1
CLOSE UP VIEW OF
SERRATED CAST IRON
LAPS FOR LAPPING
FLAT WORK
Page 4
ARRANGEMENT FOR LAPPING
N 5497
STURDY BASE AND COLUMN
OF NO 2 VERTICAL LAPPING
MACHINE ASSURE ENDURING
STABILITY
CYLINDRICAL WORK
When cylindrical work is to be lapped, the lap driving unit consists of a cast iron
body with a hollow spindle running through the center. A bronze worm wheel is attached
to the lower end of this spindle and is driven by a hardened steel worm on the main drive
shaft.
Within the hollow spindle which drives the lower lap is another spindle running
at a slower speed. Attached to this inner spindle is an adjustable slide which supports
a single eccentric drive pin for rotating the workholder. Adjustment of this slide changes
the eccentric movement imparted to the workholder. Parts to be lapped
in special workholders and positioned
on
the surface of the lower lap to which a slight
amount of abrasive of the proper grain size and hardness and mixed with a lubricant has
been applied. The hole in the workholder engages the single drive pin in the driving
mechanism. The upper lap is then lowered until its surface rests on the work. By means
of the clutch lever at the front of the machine revolution of the lower lap is started and
stopped. The rotation of the lower lap causes the pieces being lapped to roll.
The angular position of the work in the holder and the eccentric motion of the
workholder cause the work to slide. This combined rolling and sliding movement brings
the work in contact with the entire surface of both laps and, therefore, produces the
greatest possible amount of lapping action. At the same time even wear on the surface
of the laps is maintained.
are
mounted
Page 5
NO. 2 VERTICAL LAPPING
MACHINE ARRANGED
WITH TWO-PIECE WORK-
HOLDER WITH ADAPTORS
FOR LAPPING RAYON
PUMP PART
ARRANGEMENT
FOR LAPPING
FLAT WORK
The lap driving unit for the lapping of flat work is practically the same as for
cylindrical work, but the workholders and the workholder driving mechanism are quite
different. The driving mechanism is so arranged that a series of circular movements are
imparted to the workholder, approximating as nearly as possible the actual motions of
!
hand lapping.
This circular motion imparted to the workholder is derived from a stationary
gear around which rotates an internal gear and three pinions which are connected to
three drive pins. The workholder is driven from these three drive pins instead of from
a single pin as on the cylindrical work. Laps for flat work are usually serrated to provide
spaces for excess abrasive and oil and fine particles of foreign matter that the lap faces
may be kept clean.
5
Page 6
\C":
I ■
N 1007
-
N 35 20
SPIDER TYPE WORK'HOLDER FOR CYLINDRICAL PIECES HAV
ING A HOLE THROUGH THE CENTER SUCH AS PISTON PINS
W0RKII0LDER WITH ADAPTERS FOR
FLAT SURFACE LAPPING
PLATE
TYPE
WORKHOLDERS FOR FLAT WORK
Workholders
the “
plate type
three drive pins in the work driving mechanism.
In the plate type holder the work pieces lie in openings cut in a circular plate or
disc which is moved about and rotated between the revolving lap faces. Small pieces
are frequently grouped in inserts which lie in the plate opening.
In the two-piece type holder the work pieces are held in adaptors which are rotated
between a hub, driven by the three driving pins, and a split ring of about the
as the laps. This retaining ring is free to oscillate between the laps but cannot rotate.
used for lapping flat surfaces are of two general types, one known as
” and the other the “
two-piece type.
” The workholders are driven by
same
diameter
WORKHOLDER FOR CYLINDRICAL WORK
Hollow cylindrical pieces such as piston pins are carried on a “
holder. This consists of a center plate with hardened steel spindles inserted about its
periphery. These spindles are not placed radially but have their axes tangent to a small
circle at the center. The pieces fit loosely over the spindles and are held in position by
an outer ring provided with hardened steel thrust plates. Four of the spindles are longer
than the rest and the outer ring is locked to these spindles.
Cylindrical pieces having no hole through them are held in a plate type work-
holder having openings the approximate shape of the pieces so that the work piece is free
to rotate but cannot change its axial position which is the same as for
to a small circle.
spider type
” work-
hollow work, tangent
6
Page 7
mmm
LAP, TRUING DEVICE, AND 3 PIECE WORK.FOLDER
SPECIFICATIONS
Capacity
Flat Work (Thickness by longest dimension)
Cylindrical Work (Diameter by length)
Laps
Diameter
Width of face
Speed of lower lap (not adjustable chosen to suit job)
Distance between laps, standard Maximum
Floor Space
Height of machine
Motor required
Weights—approximate, with motor
Net .
Domestic Shipping
Export Shipping
Cubics—boxed for export
Because of variations in castings and equipment, exact weights cannot he given. The above
weights are in pounds and cubics are in cubic feet. Motors are included.
3 H.P. 1200 R.P.M., constant speed A.C. sleeve
bearing type with push button control
4" x 9"
4" x 9"
20", 22", 24", 26" and 28"
. Up to 9"
45 to 65
5'3" x 3' 3"
. 5'
2500 lbs.
2900 lbs.
3200 lbs.
128 cu. ft.
'//
THE DESCRIPTIONS, ILLUSTRATIONS AND SPECIFICATIONS IN THIS BOOKLET ARE CORRECT AT THE TIME OF PRINTING
MACHINES BUILT AT LATER DATES MAY DIFFER IN DETAIL DUE TO THE POLICY OF
NORTON COMPANY TO CONSTANTLY IMPROVE THEIR MACHINES
Page 8
6" x 18" SEMIAUTOMATIC
CYLINDRICAL GRINDER
10" x 20" UNIVERSAL
GRINDER
10" x 36" SEMIAUTOMATIC
CYLINDRICAL GRINDER
jNORTON
fr
PRODUCTS
ABRASIVES • GRINDING WHEELS • REFRACTORIES • FLOOR AND
STAIR TILE • AGGREGATES • NORBIDE PRODUCTS • LABELING
MACHINES • ENCAPSULATING MACHINES
MACHINES FOR
CYLINDRICAL GRINDING • SURFACE GRINDING • CYLINDRICAL
AND FLAT LAPPING • UNIVERSAL TOOL AND CUTTER GRINDING
UNIVERSAL GRINDING • SPECIALIZED GRINDING • CRANKPIN
AND CRANKSHAFT BEARING GRINDING • CAM AND SHAPE
GRINDING • CAM SHAFT GRINDING • ROLL GRINDING • CAR
WHEEL GRINDING • AUTOPART REGRINDING • ATTACHMENTS
AND EQUIPMENT FOR SPECIAL WORK
MACHINE DIVISION OFFICES
Hartford 7, 998 Farmington Avenue; New York 6, 61 Broadway;
Cleveland 3, 1306 East 55th Street; Detroit 8, 5805 Lincoln Avenue;
Chicago 32, 4737 South Christiana Avenue.
DISTRIBUTORS IN ALL PRINCIPAL CITIES
NORTON
WORCESTER 6, MASS., U. S. A.
Form 1480-6P-6P-9-50-2000
THROUGHOUT THE WORLD
CABLE ADDRESS: "NORCO"
COMPANY
Printed in United Stales of America
26
No.
lapping machine
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