The Norden Bomb Sight manual

6. Leroing

the Roller

e.

Thread the

cable through

the front telescope

cradle gudgeon.

T.

Holding the

#5 sheave in place (taper pin hole

vertical,

end of hole up, remesh

the inte-

gral shaft pinion with the gear sector.

(Taper

pin hole in the

integral shaft should be in the

same position as

the sheave.)

INSERT THE TAPER PIN.

g.

Place the tel. quad. at zero sighting angle,

and place a fiber wedge between the quad. and rate

end housing

to hold

the quad. at exactly

zero;

in case of the modified M-6 make certain

the 20%

forward view is taken out.

h.

Thread the cable past #4, #3, #2 around #l and

through the eyelet in #l sheave,

holding a slight

tension on the tel. cable to hold it in the sheaves.

i.

Pulling on the

tel. cable slightly, remove the

wedge holding gear

sector.

Slip the cable sufficiently to align the gear

sector pointer with its index; extreme binding may

result due to the fact that the cable is all the

way

around the #l sheave; therefore,

i t

necessary to pull on the cable with

the fingers

between

the #l and #2 sheaves to prevent damaging

the

a slight pressure on

the gear sector

pointer toward

max. sighting angle to shape cable

to sheaves, and

take up any slack.

Check adjust-

ment.

Correct

if necessary and thread excess cable

around eccentric.

Remove the wedge from the tel.

quad., and the

wedges from

i the cardan.

1. The roller, when properly zeroed, should rest

t te exact center of the disc witi

rate quad-

ant at zero tangent value and

trail arm

at zero mil. Fhere are three steps in zeroing of

the rolier.

A. ESTABLISH PROPER NUT GEAR CLEARANCE. The

purpose of this step is to assure that the trail

may be rotated to either of

its extremes with-

out

first having either the nut gear bottom

on the

upper portion of the rate rack housing

(when

mils

is approached) or the retaining pin striking

the lower portion of the spindle lower bearing

housing when

maximum mils is approached.)

1.

PROCEDURE.

Remove rate end and es-

tablish

nut gear clearance

mils.)

in some

sights

gear or pin-

ion

does not bottom on the thrust washer when the

nut

gear

the

on the rate rack frame; therefore

nut gear must be rotated until the thrust

k.

Apply

the

with

the

arm