ClockWorks Press ATMOS Handbuch - Seite 9

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the clearances of the guard pins are irregular, turn the pallet

fork slightly on its adjustment. If for some reason or other,

the arch of the fork had to be re-adjusted, care must be taken

to secure perfect poise. The escapement is regulated by the

pins attached to the 3/4 plate, as the banking pins fixed to the

upperbridge some into operation only in the case of over-

banking. Allow a space of 2 to 3/100th mm between the horns

of the fork and the banking pins of the bridge.

It is easy to check immediately whether the motor is in

good working condition. At a temperature of 18 to 20 C (64.4

to 68 F) studs T (Figure 1) fixed to the inside base of the

motor, are visible a few millimeters behind the back plate

(through the corresponding holes in the back frame).

At 25 C (77 F) they appear a few millimeters above T. If

the motor (diaphragm) is in bad condition, the base is

completely collapsed and touches the bottom of the inside

case; even at 25 C (77 F), it will remain in the same position,

whereas a motor in good condition will, at this temperature,

completely compress its large inner spring and the studs will

be fully visible.

Inside the sealed diaphragm is a gas which acts on a

flexible metal membrane. Under the effect of variations of

temperature (and also of atmospheric pressure) it contracts

and expands, thus causing displacement of the inner base.

When the temperature rises, the motor compresses the back

spring H (Figure 4) of the clock (invisible when the motor is

in place) to which the chain is fixed. When the temperature

decreases, the base contracts and allows the back spring to

expand.

The motor operates within temperature limits of 8 to 30 C

(46.4 to 86 F). Beyond these limits, the motor no longer winds

up the clock, but the mainspring has a normal minimum

running reserve of one year.

Within the limits specified, the motor obtains from the

variations of ambient temperature, a driving power several

times greater than that required to keep the balance going.

The power of the back spring is calculated so that it cannot

wind the mainspring by more than 5 to 7 turns. As soon as

the spring reaches this amount of tension, the motor "idles"

until, when a small fraction of power has been absorbed, the

back spring again comes into contact with the base of the

motor. This signifies, practically, a constant driving power.

It is at this point, that is to say, at the maximum at which

the back spring is able to wind the barrel spring, that the

amplitude of the balance wheel turns should be checked. It

will have to be about one and a half turns.

In 90% of ATMOS repair work, there is no need to

dismantle the balance completely. It is usually sufficient to

clean the movement and check whether all of the parts operate

freely. If the clock really does not give satisfaction, then only

is it necessary to dismantle the balance and the suspension

wire completely.