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Felsa 4000

 

Felsa 4000  (rotor missing)Felsa 4000 (rotor missing)

Description

The Felsa 4000 is an selfwinding movement with a few unusual details, which entered the market around the beginning 1960ies.

The specimen shown here might be one of the most elaborate ever - every gear is beared in two KIF-Duofix-Jewel bushings.

The base of this movement is the handwinding caliber Felsa 4010, which got a minor modification on the main bridge (for the train of the selfwinding mechanism) and an additional piggybacked selfwinding module. The advantage of this construction are reduced costs and ease of service, the disadvantage is, that the movement builds rather high.

The selfwinding module winds in both directions, and uses for the first time a rocking bar changer.

movement without selfwinding mechanismmovement without selfwinding mechanism

In the specimen shown here, a screw balance (simple, not Glucydur) is used, which is beared in two Incabloc shock protections and beats slowly with 18000 A/h. Its hairspring is fix connected to the balance cock, its effective length can be adjusted with a swan neck regulator.

The gears are all beared in jewel bushings, except the indirectly driven center second, they're all KIF-Duofix bearings, the second hand is bearted in a Girocap bushing. It is driven by a double third wheel whose teeth have got a minimal offset to avoid a lose moving center second hand. With that construction, a spring solution, which causes wear, was avoided.

Felsa 4000 dial sideFelsa 4000 dial side

 

 

 Technical data

ManufacturerFelsa
Caliber4000
Number of jewels35
EscapementAnchor with pallets
BalanceNickel screw balance
Shock protection(s)Incabloc
Balance cock directionclockwise
Hairspring studfixed
Regulator typeSwan neck
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center second pinion
Center wheel
Mainspring barrel
Construction typesolid construction
Bridge shapechopping-knife, handle right, 5 gears
Winding mechanismyoke
Setting lever spring1 holes
FeaturesSCI,AUT
FunctionsHour, minute, second, selfwinding
Beats per hour18000
Size111/2''' (measured: 25,6 mm)
Image in Flume Werksucher K2 71
Felsa 4000FelsaFelsa400011 1/2''''''Felsa 400035 Jewels, 11 1/2'''''', 18000 A/h, SCI,AUT
Factsheet

 

 

Timegrapher output

The specimen shown here, came from a watchmakers' pool and was not cleaned. The results on the timegrapher were not bad, but far away from what is expected from such an elaborate movements.

On the hanging position, you see a noticeable wave pattern, which indicates, that the escapement wheel is not perfectly round or has got an errorenous depthing.

crown rightcrown right crown topcrown top crown leftcrown left crown bottomcrown bottom 
dial topdial top dial bottomdial bottom 

 

 

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