omega 920 winding stem

[watchweasol]

Hi Gary  not having much luck there, If the crown wheel has a broken tooth its toast but you may just salvage the castle if you are carefull.

[gary17]

Hey

Is a crown wheel also known as a winding pinion?

gary

[gary17]

Hey

Is the crown wheell also called the winding pinion?

gary

[Nucejoe]

Time for me to go hide myself.especially if gary is a boxer.  

The hole in sliding pinion is couple of mm deep, too much material there to be removed by alum.

I rinse, mount sliding pinion on a stem vice, spread sand paper on flat glass, drag the winding pinion side on sand paper( stem vice prependicular to flat surface) to remove material from stem and part of winding pinion, this weakens its strucutre, remove by braking the crown in pieces. 

Re-soak the sliding pinion, couple of days, plenty of light taps on the stem. Easy dose it. Mr boxer.

 

Edited October 4, 2019 by Nucejoe
Remove winding crown by breaking in pieces

[Nucejoe]

4 hours ago, gary17 said:

Hey

Is the crown wheell also called the winding pinion?

gary

No, crown wheel sits on barrel  bridge and mesh with ratchet gears.

Eternaltools.com names parts on an illustrated glossary of parts according to ETA.

Best 

[Watchtime]

maybe this can help?411_920_complet_2208.pdf

Edited October 4, 2019 by Watchtime

[Nucejoe]

10 hours ago, Nucejoe said:

No, crown wheel sits on barrel  bridge and mesh with ratchet gears.

Eternaltools.com names parts on an illustrated glossary of parts according to ETA.

Best 

Oops my mistake.  Ignor my previouz post.

[gary17]

Thanks everyone I have a spare clutch and crown wheel. 

I will start the rebuild tonight. 

I think 1 or 2 jewels may need sorting out as well. 

But first a damn good clean. 

Gary

[watchweasol]

Hi Gary  I have attached a glossary of watch parts and their function which may be worth reading to familarise your self with the respective parts of watches.  The castle is indeed the winding pinnion. In your case you will require stem crown and castle as all three seem to be non functional now.  

Watch Technical Details.html

[watchweasol]

Hi Gary    a A little more light reading for you, armed with this document you will be able to find all the relavant parts and names  which will be better for your understanding as to what constitutes a watch movement. Hope you find it useful.  

TZIllustratedGlossary.pdf

[gary17]

Hi

Started rebuilding taking me time so just a few pics to update were i am up to.

Tomorrow should be fun i start on the chrono.

If anyone sees a problem please give me a shout

cheers

gary

[gary17]

Hi

If I tighten down the escape wheel bridge the wheels don't turn. If I back it of by. O. 5 mm it's perfect. 

Do I need a washer or is there a problem with the top jewel. It does look tight? 

Cheers

Gary

 

[nickelsilver]

This is a very solid movement, so 99.999% sure nothing shifted. If all's free up to the escape wheel good chance theres a hair or whatever under the cock causing it to tilt and clamp down. Or maybe an escape wheel pivot is bent/rusted/damaged.

 

 

 

 

[Nucejoe]

I see no endstone on escape arbor so the jewels themselves may be pushing on the arbor.

Check endshake on escape arbor. Tighten the screw so it stops runing, then check if escape arbor has any endshake left. 

Best 

[watchweasol]

Hi Gary  If doing all that has been advised the escape wheel is still tight remove all other wheels and fit the escape wheel on its own after checking that the pivots are dot damaged or bent that way there is no interaction with any other part only with the part you have issue with and it should be easier to track the fault. One thing check the seating where the escape wheel bridge sits for dings or delves, these were some times used to alter the height of plates ad bridges.

[gary17]

Yer

The escapement wheel is not damaged. The escapement pivot will not fit into jewel in escapement Bridge. It's fine until you tighten then the hole in the jewel holds the pivot to tight. 

Try and work out what my next step is. 

Cheers gary

[Nucejoe]

 Is the pivot too thick? To fit into the jewel. The reason ?  

[Nucejoe]

Perhaps the pivot stands too high so  its shoulder rubs on the jewel, in which case you should lower both jewels for the fork arbor.

Edited October 5, 2019 by Nucejoe
Skip the word " both" my mistake

[Nucejoe]

If fork pivot dosn,t get into its jewel,  perhaps wrong fork or wrong jewel.

If it dose get in, but fork gets stuck as you tighten bridge screw, you need to adjust fork jewels.

Jewel adjustment should bring pallets to level with escape wheel for proper pallet- teeth interface. 

Gentle champ .  

[gary17]

Yer pivot to thick. I have not touched jewels yet so better read up on it. 

Thanks for suggestions. 

Gary

[Nucejoe]

Pallets and escape teeth should level, geometricaly in one plane.

If the lower fork pivot gets in lower jewel hole ( hole on the mainplate), chances are the jewel in fork bridge is a wrong one.

Fork bridge may have been shimed which got washed away and you didn,t notice, wrong arbor fitted on right fork, wrong arbor& fork, wrong jewel.

 

 

[gary17]

Yer 

i have stripped the plate and started again with just the escapement wheel and bridge.

That seems to work perfectly. (see pic)

I will now add the train wheels 1 by 1 and try after i add 1 to make sure its free and see were i get to.

gary

 

[gary17]

Yer 

Every thing works fine until i put the escapement bridge on.

But once you centre the escapement pivot to fit in the jewel hole it dont work.

So i guess i need either to make the jewel hole bigger or the pivot smaller.

gary

I have everything lined up perfectly.

If i turn the centre wheel it don,t move but if i turn the escapement wheel all the train wheels turn including the centre wheel.

This cannot be correct surely?

Edited October 5, 2019 by gary17

[Nucejoe]

How do you make a jewel hole bigger? Is it metal hole?

The center wheel dosn,t like to move?   Loosen the bridge screws, see if this frees the gear train.   Any endstone on train gears pivots? 

 

[Nucejoe]

1 hour ago, gary17 said:

Yer 

Every thing works fine until i put the escapement bridge on.

But once you centre the escapement pivot to fit in the jewel hole it dont work.

So i guess i need either to make the jewel hole bigger or the pivot smaller.

gary

I have everything lined up perfectly.

If i turn the centre wheel it don,t move but if i turn the escapement wheel all the train wheels turn including the centre wheel.

This cannot be correct surely?