Grob Grob Rolls - No Chips Other

,

,,

••

,

..

.

I

GROB

One

or

more pairs
then leave the blank
cont

act

is

then

neg

ati

ve shape in the c

responding

set

of

made. The blank is continuously longitudinally advanced .

of rollers. An alm

ROLLING

plan

etar

y rollers penetrate

for

the rest

ont

act

of

area as t he

ost

a blank fo1· a sho

the cycle,

durin

fin

ished blank has.

unbelievab le va

METHOD

rt

part

of

the

ir

cycle. The rnllers

g which time the blank indexes. A new roll

ria

tion

Every contour

of

shapes

may

The rnlle rs

to

be rnll

be

ed.

have

rolled

the

has

exact

a cor-

e1·

Bar stock m
passing the entire length of the bar throu

ay

be rolled by guiding the o

uts

ide diam

gh

the machine.

for bar stock is six.

Individual blanks may be roll

ed eith er

by

automatic,

mum number of teeth on individual blanks is twelve.

Helical rolling is
inte

rfer

e with

We are

Limit

smaller machines coul

pitc

h.

The

not

recommended as bo

the

acc

ura

cy

of

the

helix.

th

the torsio nal

It

is

practica

ed only by the size of t he machines we h

d be built. O

lar

gest pi tc h diameter we rolled is12-l/2",

Rolling

zone of

GROB

ROLL

ur

with upp

prese

er

end cap

nt

work ran

re mo

ved

eter of

The

semi-au

tomat

and longitudina
l to

twist

gear

ave

produced

ge

is

coarsest pitch

the

smallest 3/16" di

to

show

rollers

in contact f

a cylin

lowest

drical ba

number

r in bu

of

ic or manual load ing.

l fo r

ces

exerted

bar

as

stock

to

or

work
4-1/2,

ameter

bar

sto

to

an

range.

finest

.

ck

rolling

shings

teeth

by

the rollers

The

pract

and

ical

mm1-

accurate helix.

Large

50

.

r and

diametra

l

The

well k nown

parts

Magnification
Material
Outside

Rao!

is

indicated

diameter

amoler

di

ext

bemehstrength

Y t e

1

to

4140

.219/
.128/.125

above

50

s,

..

,

.217

of

gram

GROB

.

ROLLED

structu re.

Dlamelraf pitch
Number
Pressure

Uaed for

of

angle

A"

" Tool

IHlh

so

9

-

ROLLER

USES

HEAD

ITS

HEAD

The

GROB exchangeable

While no

agai n
roller and
ihe oil film (Red
roller

RPM,

The same

external pressure

st

the

outer races. As the roll

the

rotor

).
contact
the roll

is

er c

rotors performed

for

ont

A GROB ROLLING

change

the

rnllers in

6

The end
tory system by a ro
of
thrust
dummy

The

act

bcorings

stotionary

rings

roller (6). Roller is in

planetary

is filled

advan

( 1)

of o roller

tot

ing

steel

out

(5).

er roces (4).

If

only one octive

is exerted

er rotates

with oil.

tages

of in

(2)

ore

bronze ro

con

precision roller

tor

(3)

Sideways

roller

toct with

supported

ond

blonk

against the roller,

against

As

the roller

termitte

ntl

y loaded

about 15°. For 345° the oil film is

is for 1/480 second.

Under

this

heavy rolling operations

HEAD

bot

is set up from one job

h rolling heads requires less

to the out

the y o

is

used

(7).

head

the

contac

being

condition

for

to

another

than

from the

center

side

restroined

re

confined

it is counter-bolonc

is

the

by

simple, reliable

cent

outer races t

ts t

he

blank,

bearings are

restored.

the

years witho

by inse

four

minute

of

the

plone

bronze

ed

by

o

force

he

clearance

the
well
If

the

has

no

showing

-

roller

known. The

rotor

time

by o poir

two

rifugal

oil

ut

rting a different

s.

and

time

drives

between the

is

pressed

rotates

to

escape

wear.

tested

the

roller

ave

.

roller.

.

into

rage

1,200

To

r!

'.

•

•

l

GENERAL

The

Grob

Rolling Method is suitable

evenly spaced on a cylindrical blank.
higher or lower

than

the

INFORMATIO

to

roll even

It

is

not

rest

of

the

teeth.

Tubular blanks can be rolled over grooved mand1·els
tubes while
with a cylindrical mandrel

The following concerns itself with solid

the

external

part

as

of

the

tubes

the

tube would expand.

are

rolled.

blank

or

possible

It

rolling only.

N7

uneven

to

roll a

which

is

not

number

contour

of

teeth

where

evenly

one

tooth

sh~pe~

permit internal corrugation

possible

to

support a tubular

1s

and

either

of

the

blank

MATERIAL

L

AND

Any ductile material may be rolled. Material
The blank
Previously cold

Work hardening depends on
of tooth formed and

must

be free of flaws, uniform in ductili

worked material should be avoided.

the

material

the

rate

of feed. Some

form a deep tooth.

For

chip making

chinability so

Cold

it

forming is

In groove forming
a severe reverse flow.

A shallow tooth
deep tooth

the

material,

A tooth with parallel sides
angle. Lower pressure
tooth with a roller to
forms

If

this permits a
ber

better

than a tooth

extreme prec ision on

free

of teeth, high

The volumes before and

cross section of

between

0.D . va1iation

the

by

the

surface of

the

tooth top B.

blank variation and

of

the

less ductile

may resist deforming

the

opposite

the

In

the

may

be

if

ang

prevent

material

carbon

les

of

case

of a rivet

satisfactorily

or

or

an

are

generally

tooth

with a curvature.

the

flow

teeth

the

blank and

to

and

tooth

the

narrow

top

after

the

flanks

rolling

the

the

rolled

the

blank A divided

part

is

materials

chip making.

is formed down

alloy steel,

undercut

bending

while

teeth

rolled

BLANK

as

composition,

material

are

desirab

during

chip

the

flow is

rolled

on
must

is

preferred.

and

insure accurate

In

most

is desired

the

sides

tops.

are

the

form

are

'

\

Therefore, chip

not

are

same.

PREPARATION

soft

as

lead

ty

and

the

work

hardens

le.

making

between

material

it

the

.

generally

be annealed.

as

easy

It

is

cases

is

advisable

rolled.

If

there

same. The

.f

has

shape

hardness

so

Steel

teeth

in

one

in

the

to

roll

desirable

division. A

it

is

practical to

not

This

is

,

._

e -

/

I

not

enough

to

produce

before

rapidly

is

hardened

making

and

that

methods

up

at

direction

Everyone seems
agree
should
annealed

on

lower

Rockwell C 20's.

as a tooth

to

contact

roll

to

roll

the

is

especially

no

elongation,

overflow rati

If
creased
outside diameter

ro
for

internal

an

accurate

strength.

rolling, the

it

is

impossible

and drawn to

do

not

the

teeth, which

only.

ly.

straight

true

o,

the

lled

±_

that

be

with

the

top

the
that

X

B

both

port

See

a riv

mode

from

material

an

sides

sided

entire

of

the

of a low

areas

is

blank

is in-

for

.001

increases

.001.

form.
depth

to

ma-

~pplf

1s

drawing.

lo

et

For

included

of

too

th

contour.

tooth,

num-

of

the

the

ratio

the

of

,

a

a

. A high tooth with. a narrow. tooth

if

~he

numbe~

It

is

not

helo,~ twelve

,

l:.CCUR~.c:·,

J'he

obt~med

a

hi?"h

~lo

cons1de13:bly less beca~se

symmetncally

of

teeth 1s low.

advisable

the

~lank

to

roll less

has a te

It

than

_ndency

STRENGTH

rollin?' procE:ss increases
by

chip !llakrng.

ss

fmish

conformmg

In

some_

well known 1~

t~e

with

1s

possible to roll a low

twelve

!he

mstances 1:ollmg

_cold

gi

am

the

teeth.

_top

is

teeth

t~

e!~ng:

A

strength

rollmg.

structure

not

very

on

an

te.

For

ID

HEAT

.. Us~ally

1s

as

_The

distortion

1s

rearranged

suitable

number

individual

bar

stock

the

precision

accurate

for

rolling. This

of

teeth,

part.

rolling

as

If

this

low

the

is

TREATING

of

rolling

as

grinding. The

in

heat

treating

in a circular

is

especially

as

six,

in

bar

number

not

a serio~~-~1~b~e~.

of

QUALITIES

is

higher

surface

of a rolled

and

uniform

than

true

stock.

teeth

that

finish

part

pattern

is

·7

is

is

GROB

STANDA

RD

SPLINE

FORMULA

0ROB

The

tooth

are

based

the

medium

diameter

number
plies
It

standardizes

it

is

height

as

the

The

spline
dimension
SPLINE are
of

the

on

before rolling

of

teeth

to

even

simpler

the
addendum.

GROB

is parallel

spline

ST ,NDAR)

thickness

the

diameter

and

on even

to

SAE

STANDARD

formulas

based

and

and

number

that

(M).

(N)

is 16.

uneven

number
manufacture
standard

over

two

of

on

the

the

mating

S PLIN E

the

tooth

of

teeth

is

the

The

The

number

rolls

involute spline

SPLINE

or

the

GROB

assumption

part

height

(N),

material

minimum

formula

of

teeth.

of

teeth

and

assumes

more

teeth.

that

are

and

ap-

as

to

measure

formula

that

was

a

Chord

STANDARD

the

teeth

of

the

same

the

root

adapted,

and

except

M

""'.ATU1>J,

N "'1.l,l,,l.lfl
N~

NUY.IU

C

o«JtO

00

-""AJOI

ltO

lOOl

outside

that

l(fOU:

t0tJJNG

Of

TUTH

Of

TtUH

o,.,

OtOI.D C

0tA.MlT£•

DIA.Y.fTU

diameters.

the

dedendum

For

is

the

the

tooth
same

thickness.

the

accuracy

A

24

tooth

aver

degre

or

.

spline

7

e

a

45

allel

a

90

spline

serration

By

of

par

teeth

included

degree

measuring

the

spline is

The

in
of the
The

creased
suggest

-

is

number
which

the

C dimension all

determined.

spline

which

case,

mating

pressure

or
that
(two

C is

measured.

A 6

tooth

See

illustrations.

may

be modified

the

spline

part.

angle

PA

decreased.

the

number

or

above)

parallel

sided

around,

by

decreasing

tooth

becomes

NC x 180° - 90° is

N

For a torque

of

teeth

to

the

division is

The

spline

GROB

has

formula

the

same

(N)

pressure

or

either

narrower

increased

efficient

is

divided

chosen

is

extremely

angle

increasing

or

or

low

pressure

by

ten, the

as

the

simple

as

an

18

tooth

the

chord

wider

decreased

than

angle

dimension.

the

if

TC

spline

nearest

number

of teeth

and

flexible.

GROB STANDARD SPLINE.

tooth

is

in-

we

whole

o,

er

The

parents

vantages

of

of

the

GROB STANDARD SPLINE

both

.

GROB

are

the

I N C .

involute

standard

GRAFTON

and

parallel

sided

,

standard

WISCONSIN

splines.

The

offspring

inherited

the ad-

GENER

AL

DESCRIPTION

OF

MACHI

NO

Two rotors are journal

in

a very rigid C

The main timing s
change gears. The C fran1e and the gear box

is an

oil tank. The oil is filtered and used

A machine bed is also bolted onto
mounted
bearings.
some cases) by hydraulic cylinders. On
screw. The carriage has a con
control
rotating hollow spindle whi

(generally used).

Belie, e

on

the bed. A ca

The

work piece is fed and

the

feed operation for manual, semi-au

it

or

not a

frame

haft is

ll

gears

ed

in a

pair

of oppos

casting.

driven from the

rri

and splines in

The

age is supported on

rot

sta

nt

rapid travel and an infinitely

ch

is

rotated either co

ing

rotors

the

are

gea

both

lower base. Replaceable

ate

d by

the

end of the bed is a

this

machine

solid

stee

l posts.

di-iven

r box

are

for

these

the carriag

tomat

through

by

gears located

mounted

cooling

rails

ic or au

ntinuously (seldom u

are

on a lower base,

and

by

e which

tomatic

GROB

The

propeller

lubrication

hardened

pressu

re l

is

prope

gear

adjustab

operatio

ROLLED

posts

are

shafts

on

a swivel

.

ubricated

lled

box

which

le

work

sed)

or

.

adjustab

from a gea

the

and

repla

by a feed

feed.

n.

The carriage

indexed intenupted

ly

mounted

bra

cket

having

bottom

ground

rotates

Limit switches

of

rai

ceab

le

screw,

the

bronze

r box.

which

ls

are

or

(in

feed

has

a

ly

,

__

__

__ _

GROB

,

howing

RO

bar

LL

No

,tock

8 -

16

foot bed

partly rolled.

f;

:,;.

.,

.

1 - . -

'"I!'

·--

..

r

,--------·-

DIMENSION

--

-

A

--

-----

ND

-

-----------

WEIGHT

OF

-

------

GROB

----

ROLLS

-

--,

I

4.3.3

4.3.3
4-3-13
8-6-8
8-6-16
8-12-8
8-6-8
8-6

-16
8-12-8
10

-6-8

10-6-16

10-12-8
10-6-8
10-6-16

10-12-8

Machine

Model

SPECIAL
STANDARD
STANDARD
STANDARD
STANDARD
STANDARD
HEAVY-DUTY
HEAVY-DUTY
HEAVY-DUTY

STANDARD
STANDARD
STANDARD
HEAVY-DUTY
HEAVY-DUTY

HEAVY-DUTY

A

4
4 3.5
4 3.5
8
8 6
8
8 6
8 6
8 6

10

10
10
10
10
10

B

3.5

6

6

6
6
6
6
6
6

C

3.25 46.5 10 1.5

3.25 46.5

3.25 46.5

6.0 47

6.0

6.0 50

6.0

6.0

6.0 50 18 3

7.37

7.37

7.37

7.37

7.37

7.37 53 .5

D E F

47 18

47 18

47 18

50.5 24.6
50

.5 24.6

53

.5 24.6

50

.5 24.6

50.5 24.6

10 1.5
10 1.5
18 3

3

18 3

3

3

3
3
3
3
3

24.6

3

T

Min

.12
.12
.12
.37
.37

6.0
.37
.37

6.0
.5
.5

6.0
.5
.5

6.0

G

Max. H l

.

62

3

62 63

3

62 182

3

76 153

6

76

6

12

82

6 76

76

6

12

82

83.5

6

83.5 255

6

12

89

.5

83

6
6

12 89.5 162

.5 162

83.5 255

63

246

153
153
246
153
162

162 60

18
18

120

60

. 144

60
60

144

60
60

144

60

144

60

Weight

in

T

lbs.

3800
3800
6700

15,000

17,500
15,300
15,

000

17,

500
15,300
17,500

20,500

18,

000
17,

500
20,

500
18,

000

,··- ··7

B

H

D

--+

: F G

I I

This

lull

nes

erence,

size

may

if

than the

path far the
chi
l
diameter

chart

vari

be use d

any,

al

the circular roll-

ous Gra

to esta

of

an

adjacent larger

root

diam

b rolli

blish inter•

eter.

ng

out

ma·

No. 8

ROOT DIAMETER

_/.

____

_

No. 8 GRO S
rol ling a sho rt ge

ROLL

ar blank

after

Ge

a r b lank removed

NO
NO
NO
NO
NO
NO

Type

Machine

,

10

HEAVY-DUTY

, 10

STANDARD

8

HEAVY-DUTY

.

8

STANDARD

.

4

STANDARD

.

4

SPECIAL

.

0.

(

Inch

Post

Dia.

10
10

8
8
4
4

Max. Max.

D.

P.

Mild

es)

Steel Steel

4½ 5½

6 8

7 10

10 12
16
16

D.

P.

Alloy

20
20

Max.

Max.

Roll

er

Rollout Roller Shaft

Dia

.

O.

Dia.

O.

Dia.

8½
8¼

SK, l ¼ l

5~,

2

}~

l ¾

3

2

~~

l

Vi

¼

J,

7~

l¼

1}2

Ya

7

;'

, a

1,

/ l

V

2

Race

I.

Di

7J/

ni

4
411

2

]l

/ 8

/ I

tJ{

,

a.

1

,,

/

,

Act

heavy

ual

si%e

d u

ty roller

No.

10

SPINDLE

TIMING

FUNCTION

Two pins (blue)

ing

plate

(bronze)
indexing
the

For
has
head
15

degrees

The
acceleration

plate

inside

one

revolution

only

one

makes

portion

the

distance

active

two revolutions while

while

of

the

force

are

located on a

has

parallel sided

sides

of

the

between

of

the

pin

roller. A rolling

arresting

slot

is

not

the

which loc

used

OF

pin

slots

the

pins.

shaft

indexing

ates

for

INDEXING

shaft

follow a

the

the

locating.

slots

indexing

head

pin

plate

is

not

connected

closely

true

makes

shaft

under

The

to a flywheel

engaging

circle.

plate

one

makes

the

rolling

kinetic

useful life

MECHANISM

the

The

diameter

indexes

revolution

of

one

revolution.

head

load,

the

twice.

while

indexing

rotating

pins.

per

rotates

the

continuously.

On

the

of

this

In

most

index.

If

30

degrees.

portion

plate

outer

Therefore,

the

therefore

diameter

circle

cases a rolling

is

pin

which

the

the

shaft

receives

is

An

same

rolling

rotates

very

index-

of

the

as

head

the

long.

INDEXING

ARRESTED

Direct

indexed

(

interrupted
driven by pin shaft. The pin
and

is

driven from

the

continuous

shaft.

)

rotation.

shaft

is

connected
rotating

Inde

xing
to

a flywheel

splined

plate

timing

is

mounted
ably
plate
mounted

on

an

journaled

independent

on

axis. The idler

on

the

main spindle.

rotation

a swinging

gear

the

axis. An idler

arm,

hinging

also

engages a master

indexing

gear

on

the indexing

plate

is

is

adjust-

gear

Same

as

upp

er

right

with

master

gear

removed .

Continuous

rotation.

Spindle

is

direct

ly

geared

ously rotating splined timing shaft. (Seldom used).

ta

continu•

ING

MACHINES

ARE

WELL

-

Whether

you

DESIGNED

believe

you

We believed we could do
We

We

oil

ment
are

admit

are

pumps,

equipped

it

was

not

easy.

proud that today

water

pumps,

, office equipment,

with

GROB ROLLED precision

More is to come.

can do

what

It

took

many

airplanes, machine tools,

tractors,

printing

AND

it

or not,

others

years

earth

presses, satellites etc.

you

are

right

considered impossible.

of

hard

work

moving equip-

parts

If o

machine

o

port

just

build

indexing

machined

jig

boring
rotating
ter

indexing
heat
plate

. A light finishing

on

ly

machine.

is

not

plate

table

treated

is

token

tool
availab

it.

is precision

on

on

machine.

and

jig

support the

duct

A GROB

on

EXPERTLY

-

The

.

to

make

le

optical

o mo

ile

iron

this

and, yes,

we

A

s•

cut

stubbornness.

GROB

BUIL.T

ROLLS

are

the

result.

,P

. . '

_I

I

A

No.

4 GROB

The overage

ROLL

production

spline,

per

outomoticolly

set

of

roll,

-

-

10

sh

oft

ends

per

is

at

least

100,000

minute. The

mild

,tee I ,hafts

cost

.

of o set

of

roll,

is

$35.00.

-

-

AUTOMATIC

GROB
flow

to

chip

The

regrinding

ROLLS

of

parts

another

making.

simp

le

is

low

or

assure

with

fast

cost

adj

con

little mai

and

easy.

rollers

ustment

sistant

ntenan

The

have

until

7

stea

dy

ce.

cost

of

a long life

they

are

production.

Little skill is needed

operation,

and

replaced.

The

GROB

as

well

are

quickly exchangeable. Rollers

to

as

ROLLS

operate

power

produce

them.

consumption,

Set

an

uninterrupted

up

from

is

a

fraction

are

used

one

job

of

without

r

..

GROB

Grob

Rolled Bar Stock • Grob Rolls •

I N

C.

Grob

Manufacturers

Band

Saws •

GRAFTON,

of

Grob

Filing Machines • Grob Band

WISCONSIN

Saw

Llrho

Welders

In

U.S.A. -

OlC..S.C