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Bifora 2030 SC

 

Bifora 2030 SCBifora 2030 SC

Description

1940 launches Bifora (Bidlingmaier in Schwäbisch Gmünd, Germany) their second inhouse form movement, which was now equipped with an indirectly driven center second and a KIF Protechoc shock protection. Is size was 8 3/4 x 12 lignes and was so equal to its predecessor, the Bifora 2025.

This movement is a pillar construction.

 base platebase plate

All important bearings are ruby-equipped.

You also see very well the (unfortunately broken on the specimen shown here) setting lever spring of the rocking bar winding system. This spring is not located on the dial side, but on the movement side!

gear traingear train

We have the classical gear train here with (potential) decentral second at 6 o'clock and large mainspring barrel on top. The directly driven minute wheel is hollowed for the central seconds wheel. This is driven by a wheel on top of the third wheel on top of the movement plate, and it's held in place by a spring, which avoids fluttering.

side view of the gear trainside view of the gear train

The screw balance is beared in two KIF Protechoc bearings and beats contemporarily slow with 18000 A/h. It regulares a conventional pallet lever movement of swiss type.

Bifora 2030 SC dial sideBifora 2030 SC dial side

On the dial side, you see the click mechanism with its ratchet and the rocking bar winding system.

 

 

 Technical data

ManufacturerBifora
Caliber2030 SC
Number of jewels15
EscapementAnchor with pallets
BalanceNickel screw balance
Shock protection(s)KIF Protechoc
Balance cock directionclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel, Mainspring barrel
Center second pinion
Construction typepillar construction
Winding mechanismRocking bar
Setting lever spring2 holes
FeaturesSCI
FunctionsHour, minute, second
Beats per hour18000
Size83/4 x 12''' (measured: 20,0 x 24,5 mm)
Production time1940 - 1953
Image in Flume Werksucher K1 -
Inventory ID 17001
Bifora 2030 SCBiforaBifora2030 SC1940 - 19538 3/4 ''' 12'''Bifora 2030 SC15 Jewels, 8 3/4 x 12''', 18000 A/h, SCI
Factsheet

 

 

 

In the lab

The specimen shown here was in fair condition, when it came into the lab. Unfortunatly, the prolonged axle of the third wheel was already weakened, so it broke, when the seconds driving wheel was removed. Since it did not break the remaining function, it was left as it was and no service was made.

 

 

 

On the timegrapher

vertical positions
positiondeviationbeat error amplitude
12 up  -141 seconds/day  2.8 ms  126 °
3 up  +50 seconds/day  3.7 ms  124 °
6 up  -35 seconds/day  2.1 ms  145 °
9 up  -759 seconds/day  2.6 ms  161 °
horizontal positions
positiondeviationbeat error amplitude
dial down  +24 seconds/day  2.3 ms  186 °
dial oben  +100 seconds/day  1.9 ms  197 °
timegrapher measurings

On the timegrapher, the Bifora 2030 SC offered the expected picture of a long-used but not recently revised watch. The amplitude is still OK on horizontal position, but hanging, it breaks in strongly. The beat error values scatter relatively strongly, the massive outlier at crown down can not really be explained, even in other hanging locations there were sometimes very strong outliers (which partly overcame the time scale), which however after some time also disappeared again. A service and also a replacement of the balance shafts would probably be appropriate.

 

 

 

Usage gallery

Bifora gents watchBifora gents watch