Monarch 6 Series - Page 7

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-

-

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in connection with the

automatic

length

stop,

chasing threads up

to

a

shoulder

or

in a blind

hole.

On an engine

lathe

the

leadscrew

reverse

lever

is

found on the

front

of

the

headstock

dire

c

tly

above

the

gear

box.

Figure

7

shows

the

automatic

length

stop

and

adjusting

c

ollar

at

the

left

hand

side

of

the

apron.

This

stop

is

a

time

saver

not only when

chasing

threads

but

also

for

ordinary

turning

operations.

A si

milar

stop

on

the

right

hand end of

the

lead-

screw

reverse

c

ontrol

rod

provides

an

automat-

ic stop with

the

carriage

moving

toward

the

tail-

stock

. To

set

stop

(A),

position

the

threading

or

turning

tool

to

the

required

point

on

the

work

;

then with

the

leadscrew

reverse

lever

in

neutral

position

,

pla

ce

stop

(

A)

against

adjusting

collar

(B) and

tighten

stud

(C).

Collar

(B)

is

for

the

final

close

adjustme

nt and

is

locked

in

place

with nut (D) .

FIGURE

7

Automatic Length Stop

at

Left

Hand

Side

of

Apron

CROSS

FEED

DIAL

AND

THREAD

CHASING

STOP

\

Cross

feed

diameter

dial

(A),

Figure

8,

is

grad-

uated

to

read

in one

thousandths

of

an

inch.

There

are

two

sets

of

numbers.

The

set

nearer

to

the

operator

is

for

reading

when

the

cross

slide

is

feeding

toward

the

front

of

the

machine.

The

second

set

of

numbers

is

used

when

the

c

ross

slide

is

feeding

toward

the

rear

of

the

machine

.

The

dial

is

graduated

to

read

direct,

FIGURE

8

Close-up

of

Cros

s Feed M icrometer Dial

that

is

, .001" on

the

dial

equals

.001" on

the

diameter

or

the

bore

of

the

work.

The

cross

feed

dial

is

locked by

means

of

lever

(B)

whenever

it

is

necessary

to

move

the

dial

for

repositioning

in

relation

to

the

tool.

Thread

chasing

stop

(C)

is

used

to

eliminate

the

slow

and

tedious

operation

of

repositioning

the

tool

to

zero

or

some

other

reading

on

the

cross

feed

dial

,

after

each

cut.

With

the

thread

c

hasing

stop,

the

operator

need

not look

at

the

dial

when

repositioning

the

tool

.

It

is

necessary

only

to

run

the

c

ross

slide

in

to

the

stop

and

proceed

with

the

next

cut.

When

the

thread

chasing

stop

is

engaged

(by

turning

the

knob

all

the

way in),

there

are

three

complete

turns

. of

the

cross

feed

handwheel

between

the

in and

out

stop

positions

at

which two

points

the

diameter

dial

always

reads

the

same.

Graduations

(D) c

lose

to

the

front

of

the

dial

ar e

used

in conjunction

with

lock

{B)

for

the

finish-

ing

cuts

.

This

permits

straight

feed

in of the

tool

instead

of.

an

angle

feed

in

with

th

e

result

that

the

finishing

cuts

are

taken

on both

sides

of

the

thread.

The

following

is

the

pro

c

edure

. Run

the

cross

feed

dial

in

to

the

stop.

Then

, unlock

lever

(B) which

allows

the

cr

oss

slide

to

be

moved

in

without

disengaging

stop

(C) .

Each

of

the

graduations

(D)

equals

.001".

7