Yard-Man 12872-8 User Manual download pdf (Page 9)

ISS&SDNSCO::.

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Polishing

treated

in su

ch

a way

that

the

stee

l is

made

tough

and

durab

le.

Thi

s

opera

ti

on

is so accur

ate

ly

regulated th

at

th

e blades

of

a

ll

Wiss Shears are

of

un iform

tem-

per

or hardness.

This

is

of

great

importance, for

whenever there is even a s

li

ght

difference in

temper

,

the

h

arder

blade wi

ll

wear

int

o

the

softer

one, greatly sh

ortening

the

Jife

of

the shears,

and

no amo

unt

of

grinding

or

sha

rp

en

in

g

can

ever

remedy this condition.

It

is largely because

of

the

ir

evenly

tempered

blades th

at

Wiss

Shears

last a lifetim

e.

"

PEENING

"

AN

D

GR

I

ND

I

NG

The

ri

gors

of

hardening

and

tem

-

per

ing h

ave

left

th

eir i

mpr

int

the bl

ade

, so

that

it is now

wa

rp

ed

and

crooked.

It

must

be

·"

peened

, · ·

or

st

r

aig

h

tened

,

into

prope

r

shape.

A skillful mechanic places

the

blade

on

an

anv

il

and

taps

it

carefully with a

li

ght

hammer

until

th

e desired

shape

is

se-

c

ur

ed.

The

bl

ade

is

sti

ll

cru

de

but

soon loses its rough

appea

r-

ance when ground on

va

ri

ous

s t

ones

, m

easu

rin

g fr

om

fifteen inches to six feet in

diameter.

TH

E F JN ! S

HING

To

ucHES

Up

to this

stage

the

blades

ha

ve

been

treated

sepa

r

ate

ly.

Now

they

are

pa

ired,

and

screwed

toget

her, and

put

in

to

perfect sh

ap

e.

Th

e shears are n

ext

polished,

nickel

plated

or

japanned

, as

the

case

may

be- and

then

finished.

f-'inis

hin

g

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