Movement casing screws and clamps is mandatory to use ?

[mehm]

 

I have a question regarding movement casing screws and clamps. I've been working on a case and haven't experienced any shaking issues so far, but I'm unsure if I should use clamps or not ? 

Is it mandatory to use clamps on movement holding ring , or can I work with screws without clamps to lock the movement to the case ? 

 

 

Edited February 10 by mehm
Zoomed the image

[AndyGSi]

Not quite sure what you mean as that looks like the clamp under the screw?

[mehm]

1 hour ago, AndyGSi said:

Not quite sure what you mean as that looks like the clamp under the screw?

Yes sir , but I'm not using clamp right now , I feel like it's no use to me, but is mandatory to use ?

Edited February 10 by mehm
Refrasing the answer

[Knebo]

Hi @mehm, 

so the picture you posted is from disassembly and you then didn't put the clamp back during re-assembly?

I'd say it's better to use it!

Without the clamps, the movement is held only be the winding stem and maybe by the dial (depending on the case construction). And you don't want to put too much strain on those one/two components. Over time, it may cause damage.

 

[mehm]

1 hour ago, mehm said:

 

I have a question regarding movement casing screws and clamps. I've been working on a case and haven't experienced any shaking issues so far, but I'm unsure if I should use clamps or not ? 

Is it mandatory to use clamps on movement holding ring , or can I work with screws without clamps to lock the movement to the case ? 

 

 

Need advise sir : @oldhippy @Knebo @watchweasol @Nucejoe

[Knebo]

5 minutes ago, mehm said:

Need advise sir : @oldhippy @Knebo @watchweasol @Nucejoe

I just gave my opinion. Did you not see it?

[AndyGSi]

They're there for a reason so best to fit them.

[mehm]

10 minutes ago, Knebo said:

Hi @mehm, 

so the picture you posted is from disassembly and you then didn't put the clamp back during re-assembly?

I'd say it's better to use it!

Without the clamps, the movement is held only be the winding stem and maybe by the dial (depending on the case construction). And you don't want to put too much strain on those one/two components. Over time, it may cause damage.

 

Hello @Knebo so far I didn't use the clamps on this case, I have feared it might cut off I guess and confused to use in correct way , I share some images with the text on , so I might be good to understand me the right way I should use 

 

Edited February 10 by mehm
Wrong image

[Knebo]

Ah, I think I understand what's going on. You didn't find a case clamp when disassembling and now you're asking yourself if you should add one?

 

Edited February 10 by Knebo

[mehm]

3 minutes ago, Knebo said:

I think the two pictures are the same, no?

No, the clamps A is up and the clamps type B is down phasing 

[Knebo]

Yes, I saw you corrected the picture. I saw it before you changed it.

[mehm]

6 minutes ago, Knebo said:

Ah, I think I understand what's going on. You didn't find a case clamp when disassembling and now you're asking yourself if you should add one?

 

Yes

[Knebo]

The answer is, no. You don't need a "separate" case clamp. The screws you currently have basically have an "integrated" camp. Let's call it a clamp-screw. It's holding the movement in the ring just fine.

This is an Eta 2824/SW 200, no? If so, I can confirm from my own service experience, that these are the camp-screw commonly used there and they are correct.

See inside the green box on your picture:

[mehm]

1 minute ago, Knebo said:

The answer is, no. You don't need a "separate" case clamp. The screws you currently have basically have an "integrated" camp. Let's call it a clamp-screw. It's holding the movement in the ring just fine.

This is an Eta 2824/SW 200, no? If so, I can confirm from my own service experience, that these are the camp-screw commonly used there and they are correct.

See inside the green box on your picture:

ahh thank you so much @Knebo @AndyGSi

 Thank you so much everyone who helped me thru this : 

i look forward to come up with everyone next time again >3

[Knebo]

3 minutes ago, mehm said:

ahh thank you so much @Knebo @AndyGSi

 Thank you so much everyone who helped me thru this : 

i look forward to come up with everyone next time again >3

You're welcome. 

PS: as you can see, it's always helpful to post information on the watch and movement in the initial post. I could have given you the right answer immediately. 

[mehm]

20 minutes ago, Knebo said:

You're welcome. 

PS: as you can see, it's always helpful to post information on the watch and movement in the initial post. I could have given you the right answer immediately. 

you're right, providing more context upfront would have helped me respond you more accurate. i appreciate your insight and will keep it in mind for future conversation. thanks again  

[Knebo]

most welcome

[eccentric59]

Not so fast. While @Knebo is most likely correct, I would point out that this only secures the movement to the movement ring. There are a few more considerations. How is the ring secured to the case? Sometimes there are case clamps that secure the ring to the case so that these shouldered screws are enough to hold the movement to the ring. Sometimes there is a plastic case ring that holds the ring to the case when the case back is tightened down. Sometimes there is a long case clamp that goes across the ring to the case itself. Like this Longines ...

 

If there is no plastic retaining ring or case clamps for the movement ring, then the stem is the only thing holding the movement and dial in the proper position. If you assemble the watch without the case clamps and you pull out the stem and can make the movement and dial move by wiggling the crown, then I'd say the clamps would be a good idea, although it's odd to see shouldered screws used with case clamps. It's usually one or the other.

The other thing to consider, especially with a 2824 or SW200 is the height of the screw head and clamp thickness. If the clamp is too thick and the head is too tall, it could easily interfere with the rotor.

[Knebo]

3 hours ago, eccentric59 said:

Not so fast. While @Knebo is most likely correct, I would point out that this only secures the movement to the movement ring. There are a few more considerations. How is the ring secured to the case? Sometimes there are case clamps that secure the ring to the case so that these shouldered screws are enough to hold the movement to the ring. Sometimes there is a plastic case ring that holds the ring to the case when the case back is tightened down. Sometimes there is a long case clamp that goes across the ring to the case itself. Like this Longines ...

 

If there is no plastic retaining ring or case clamps for the movement ring, then the stem is the only thing holding the movement and dial in the proper position. If you assemble the watch without the case clamps and you pull out the stem and can make the movement and dial move by wiggling the crown, then I'd say the clamps would be a good idea, although it's odd to see shouldered screws used with case clamps. It's usually one or the other.

The other thing to consider, especially with a 2824 or SW200 is the height of the screw head and clamp thickness. If the clamp is too thick and the head is too tall, it could easily interfere with the rotor.

Yes of course. We only discussed the movement in the movement ring. Movement ring in case is a different story. I assumed @mehm had that covered. 

But yes, better to check. 

[Nucejoe]

 Unless putting screws/ clamp  back on, cause a problem, eliminating them isn't a good idea. 

 Tightening the screws can force  tension into the assembly thus  affect  amplitude or stop the movement, such that lossening  the screws lets  the movement start running again, even then one can shellac loosened screws fixed in place, so to prevent wear due to loose movement inside the case.

 I expect to get a frown from master praezis for this advice, but good portion of us are happy with the watch running and keeping good time.

Rgds

 

 

 

 

[mehm]

On 2/11/2025 at 1:41 AM, Knebo said:

Yes of course. We only discussed the movement in the movement ring. Movement ring in case is a different story. I assumed @mehm had that covered. 

But yes, better to check. 

@eccentric59 @Knebo my problems i mean the doubt of mine is solved, i had a doubt about the movement in the movement ring, and i got your point as well eccentric but if i asked myself and everyone i do believe there should have cut off (point or space to fit the clamp in movement ring just like we have in case that hold the movement ring case , if thats not then i totally agree to the point that knebo shared that we dont need clamps again if the flat screw in fitting the movemnt ring very well, no shaking of movement and no wiggling in that case , but thank you coming up with great image @eccentric59 to make me understand well  thank you again 

looking forward to coming up with new curios doubts, and discuss with you"ll 

 

[Knebo]

2 hours ago, mehm said:

@eccentric59 @Knebo my problems i mean the doubt of mine is solved, i had a doubt about the movement in the movement ring, and i got your point as well eccentric but if i asked myself and everyone i do believe there should have cut off (point or space to fit the clamp in movement ring just like we have in case that hold the movement ring case , if thats not then i totally agree to the point that knebo shared that we dont need clamps again if the flat screw in fitting the movemnt ring very well, no shaking of movement and no wiggling in that case , but thank you coming up with great image @eccentric59 to make me understand well  thank you again 

looking forward to coming up with new curios doubts, and discuss with you"ll 

 

Just to be clear, I'd expect a casing situation like in the image below:

Two clamping-screws (i.e. screw with integrated clamp) and 2-3 casing clamps and screws. Or a plastic holding rings, as @eccentric59wrote. But I think @mehmgot this covered. 

[mehm]

1 hour ago, Knebo said:

Just to be clear, I'd expect a casing situation like in the image below:

Two clamping-screws (i.e. screw with integrated clamp) and 2-3 casing clamps and screws. Or a plastic holding rings, as @eccentric59wrote. But I think @mehmgot this covered. 

yes sir  thanks again i will keep this in my mind always 

[SwissSeiko]

Some cases use the case back to secure the movement ring in place. I just worked on an Oris that had this setup.