I was curious and decided to timelapse the date change.
To me, it looks like the hour hand doesn't start moving until about five minutes after the date change...
Hour Hand Jumps Forward 5 Minutes At the Date Change and Does Not Move Again For 5 Minutes
This is an inherent aspect of the Vostok mechanism or movement.
This may apply to all 24xx mechanisms.
When the Hour hand jumps 5 min., it is actually an amount of slack in the gear train which is equal to an amount of approximately 5 min.
In other words, all the available slack is taken as the instant date change mechanism pushes out or removes this slack and this produces a 5 min. instant jump forward of the Hour Wheel. This jump ahead basically makes the Hour Wheel 5 min. ahead of the rest of the gear train, such as the Minute Wheel.
The Hour hand, that is the Hour Wheel, now stalls and will not begin moving fully again until the other parts of the gear train such as the Minute Wheel, consumes this slack or 'catches up' to the Hour Wheel which was shifted beyond the 'reach' of the gear train. The teeth of the Hour Wheel remain in contact with the gear train, but there is little to no pressure on the Hour Wheel until the gear train has taken the 5 min. of slack from the system and becomes fully engaged with the Hour Wheel, applying full pressure to it.
At this point, the entire gear train will provide full pressure on the Hour Wheel and the Hour hand will begin moving again.
So, the entire movement, or mechanism, does not essentially have a system to 'make up' the 'gained' 5 min.
It is basically the slack in the gear train that allows the Hour Hand to be temporarily moved ahead 5 min. until this slack is overcome and the rest of the gear train exerts normal pressure or energy on the Hour hand.
If the Hour Hand or Minute Hand is pushed forward or backward gently with a tool, you will see the slack or less than perfect tolerances in the gear train.
If there was absolute zero slack or perfect machining tolerance in the gear train, the movement would stop since each pivot would be stuck in its jewel and each gear, or wheel, would be locked together as there would not be enough extra space for the teeth to move or there would be too much friction.
So, a certain amount of slack is required for the parts of a watch movement to move properly with as little friction as possible.
Too much slack, or tolerances that are poor, and the parts would jump or bounce or engage with too little pressure or energy.
The watch would then keep erratic time or it would stop completely due to misalignment of the gears.
Last edited by Matt_Bored_O; January 18th, 2019 at 05:40.
Last edited by Matt_Bored_O; January 18th, 2019 at 02:57.
Never use force. Get a bigger hammer.
It makes more sense that the drivetrain doesn't jump ahead, but instead is held up by the spring loading (resistance) of the calendar complication.
When the date wheel click to the next date, the back pressure in the drivetrain is released and the hour hand moves forward to where it should be if it had not been held up by building enough pressure to push the calendar stud past the spring that holds the date in place.
Hi guys, have you ever done a power reserve check on your Vostok? I've always wondered how true the claim of 31hrs was as it seemed always to run a bit too long after I'd leave it for another watch in the rotation. So I wound it up, set the time to 0:00 and saw how far it would run and...40hrs exactly! 0.0
Inviato dal mio SM-G935F utilizzando Tapatalk
Movement / Mechanism Holder
A movement or mechanism holder is a tool every Vostok owner needs to hold the mechanism to repair it or install dials and hands.
Currently, there are no holders produced specifically for the Vostok 24xx and 22xx models.
Universal Vise Style Holders
Commonly available and are easy to use.
Disadvantage: there is no centre pin to support the Seconds Hand Pinion of the Vostok mechanisms.
This is necessary especially for the 2409 and 2414 which require a support for the pinion when installing the Seconds Hand.
If you choose a vise style holder, buy a Large Size.
This will hold 22xx and 24xx Vostok and larger mechanisms you may repair in the future.
Cylinder Style Holder: Specific Size
A holder made for specific mechanisms is often easier to use versus a vise style holder. They are often designed to allow the mechanism to be turned over to work on the opposite side, same as a vise style holder, however a custom cylinder style is usually easier to use for amateur watch repairers. There are no projecting bolts or knobs - this may prevent accidents.
Advantage: There is usually a support post or pin for mechanisms which require this.
Centre Pin with Slot for stem
Dave Murphy of Murphy Manufacturing, a highly respected producer of bezels for Vostok and Seiko , has begun producing a holder for Seiko mechanisms.
He is now contemplating producing a Vostok holder.
I suspect that if enough of us contact him and ask him to produce a holder he may do so.
I believe there would be much demand for this very helpful tool.
If he decides to produce this, ask him to put your name on a waiting list and you will be notified when they are produced.
This is the system he employs to notify those who want to purchase his bezels, when the bezels are not in stock.
Hopefully, if he produces these, he will include a suport post or pin.
Dave Murphy bezels for Vostok and Seiko are highly recommended in this forum.
I would assume his holders would be of equal quality.
If you contact him: Specify if you need a holder for 24xx and / or 22xx mechanisms
Contact: [email protected]
Murphy Manufacturing Co., Inc.
Murphy Manufacturing Seiko Holder #TL8010
Last edited by Matt_Bored_O; January 20th, 2019 at 19:42.
There are currently 1 users browsing this thread. (0 members and 1 guests)