Yard-Man 12872-8 User Manual download pdf (Page 8)

I

U~ISSatSDNSCO.

I

the

two pieces,

afte

r

we

ldi

ng

,

become

one

and

forever in-

separable

.

Cruc

ible steel is used because

it

takes

a very h

ard

degree

of

temper

,

and

therefore can

take

and

hold the keen

est

possible edge.

Th

us

we

obtain

cutt

i

ng

edges th

at

wi

ll

stay

sh

arp

for an i

nde

fini

te

time.

D R

IL

LI

NG

TH

E

ScREW

H o L E

After

weld

i

ng

, t h e

blade

m

ust

be

tr

imm

ed

of a

ll

s

ur

-

plus

meta

l

to

restore

its

proper

sh

ape.

Th

e

screw hole is then

dril led ;

and

although

t

hi

s

is

apparen

tly a

s

im

ple

operat

ion,

it

is

7

done

with the

ut

most care

and precision .

Th

e posit ion

and size

of

th

e hole

mu

st

be

exact to the thousandth part

of

an inch,

ot

herwise the

blades would be loose, and

th

e shears would n

ot

cut

smoothly- a condition

of

t

en

fo

un

d in she

ar

s of i

nf

erior

quality.

H A

RD

E

NIN

G AN D

TEMP

E

RIN

G

The

bl

ade

is

now r

eady

f

or

harde

nin

g.

It is h

eated

to

a

fixed degree and, while h

ot,

plunged in

to

a

ta

nk of r

un

-

ning

water.

After

h

arde

ni

ng, the blade is

tempered.

It is placed in a

special so

lu

t ion, and h

eat

G r in

ding

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