Abrasive Machine Tool No. 34 Surface Grinding Machine, Vertical Spindle Top Grinder, Surface

Abrasive

Machine

Tool Co.

No. 34 Surface Grinding Machine

Vertical

(Showing Motor Drive)

Spindle Top

Foreword

Many types of flat grinding can be done faster and much more economically in a properly
designed Surface Grinder using a vertical spindle and cup wheel. Examples of such work would
be small flat dies, washers, punches, spacers, chasers, parallels, raising blocks, etc.

The design of this machine is a departure from previous models. An attempt was made to
produce a Vertical Spindle type which would provide more power at the cutting point, decrease
vibration, and eliminate belting troubles. We believe this No. 34 grinder successfully meets these
requirements.

The Base is a one-piece casting, strongly ribbed, and well proportioned. It follows the well-

known "ABRASIVE" principle of design which was originated by this Company.

The heavy Spindle, mounted on high-grade ball bearings at top and bottom, is driven by
hardened and lapped spiral bevel gears. These gears are lubricated by oil under pressure, sup
plied by a separate geared pump. The operation is smooth, positive, and powerful.

The Saddle is deep and well ribbed to prevent distortion, and engages with the Bed by two
V-ways.

The Table is comparatively light
cates on

built-in shock absorber eliminates shock of table reversal, and two speeds are available.

Case, Table ways and Saddle ways are automatically lubricated from ample reservoirs.
and fully guaranteed for one year against defects.

the Saddle in

The Transmission Case is a complete drive unit, readily detachable from the machine. A

Lubrication of most of the bearings is by means of a Bijur One-Shot system. Transmission
All materials and workmanship are of the finest obtainable,

one V-way and one flat way.

in weight but deep to maintain proper alignment. It recipro

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TYPE:—No. 34 Vertical Spindle, Reciprocating Table. Automatic Down Feed.

CAPACITY:—Longitudinal, automatic, 24" (610 m/m) total longitudinal movement 33" (838 m/m).

Transverse, hand, 8" (200 m/m) total transverse movement 9" (229 m/m).
Vertical, automatic, 12" (305 m/m) total vertical movement 13" (330 m/m).

WORK TABLE:—Work Surface, 8" x 24" (200 x 610 m/m) overall 59" x 10V2" (1500 x 270 m/m).

Three 9/16" T-Slots (14.28 m/m) for l/2" T-Bolts.

SPINDLE:

—

The Wheel Spindle is an alloy steel of massive proportions to eliminate torsional vibra

tion. It is mounted in large Radio-thrust Ball Bearings, provided with automatic adjustment

for wear and end-thrust.

It is carried in a very heavy Wheel Slide which has square vertical ways and taper gib to
take up wear. This slide is suspended on a Ball Thrust Bearing and actuated by means of
worm and worm wheel, elevating screw and bronze nut.

WHEELS:—Standard wheel is a Type 2 cylinder wheel, steel back, 5" in diameter. On special

order 6" wheel equipment can be supplied.

SPEEDS:—Normal Spindle speed for 5" diameter wheel is 3050 R.P.M. Table speeds, 20 feet and

40 feet per minute. Changes made with push-pull knob at front of transmission case.

FEEDS:—Table feed from two-speed transmission case to long pinion, bull-gear and table rack.

Friction gear at end of long pinion to reduce shock of table reversal. Transmission case self-

lubricating. Table feed automatic in either direction, length of stroke being obtained by set
ting of adjustable dogs. Reversing lever in Saddle so table can be reversed by hand at any

point.
A Friction Gear prevents damage to driving parts if table or work meet with a collision.
Transverse feed by hand.
Vertical feed automatic or

hand adjustment. The amount of feed can be adjusted to advance

from 0.000125" to 0.002", or 0.0025 m/m to 0.04 m/m at each table reversal. The dial can be

set to a predetermined depth of cut and will automatically throw out the feed at the desired

point, or it can be locked for continuous feeding. Wheel wear must be considered when
working to close figures.

Hand Wheel for fine adjustment, on left side of Wheel Slide is provided with dial graduated
to 0.00025", or to 1/100 m/m if desired. Hand Wheel for rapid adjustment, on right side,
having 3 to 1 acceleration.

DRIVE:—Individual Motor.

Motor required, 71/z
supplied by us we furnish ball bearing motor and magnetic starter

H.P., 1750 R.P.M., open type, 40 deg. C. rise for continuous duty. When

with push button control.

All wiring is fully enclosed, and all necessary belting is furnished.

STANDARD EQUIPMENT:—Standard equipment consists of Wet Grinding Attachment which

includes table guards, wheel guard, connections, portable tank, and motorized centrifugal

pump, one type 2 grinding wheel, one wheel dresser, necessary tools and one can of soluble

oil.

FLOOR SPACE:—Transversely, 48" (1220 m/m). Longitudinally, 108" (2746 m/m).
WEIGHTS:—Net

weight, about 3000 lbs. (1360 Kg.).
Gross Domestic shipping weight, about 3240 lbs. (1470 Kg.).
Gross Foreign shipping weight, about 3620 lbs. (1640 Kg.).

SHIPPING

DIMENSIONS:—Domestic, 48" x 53" x 77".
Export, 49" x 58" x 78" (1244 x 1473 x 1981 m/m).
Space

occupied, about 128 cu. ft. (3.62 cu. meters).

MISCELLANEOUS:—Several makes and sizes of Magnetic Chucks are available for use with this

machine, and are recommended

of

Most

the lubrication

is taken care of by a central one-shot system.

for a large variety of work.

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NOTE.—

This is the Standard Form for Specifications adopted by the Surface Grinder

Group of the N.M.T.BJL

Does It Grind?

The illustration shows characteristic wheel chips from

this

grinder when operating

means
the material being ground. The automatic vertical feed must

be suited to the grade of wheel employed so that the wheel
will break
There must also be a copious flow of cutting coolant.

respects to ideal lathe turnings in miniature.

31/2% Nickel Steel, 2l/z" wide by 14" long. Table feed 20 ft.
per minute. Vertical feed at each table reverse .00075".
Wheel used, 3830-H Vitrified.

that the

Note the long curling nature of chips, similar in all

The material ground in this instance was unannealed.

wheel and speed for same must be correct for

down as soon as the

under favorable conditions. This

cutting points

become dulled.

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ROTARY GRINDING ATTACHMENT:—For Application to No. 34, No. 3B and No. 33 Abrasive

Surface Grinders.

An individual motor driven rotary magnetic chuck with the following characteristics:
Chuck

Diameter 12". Four speeds: 22, 15, 10, 7 R.P.M. (4 step V-Pulley).

Motor: 1/4 H.P. 420 R.P.M.

Maximum vertical capacity between top of chuck and full size wheel 7" on either No. 34 or

No. 3B machines.

Overall
Shipping weight 340 lbs.

Dimensions

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long, 11" high, 17" wide.

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Printed in United States of America 2000-1 o-4i