Anybody know if a movement conversion for 8N-24 Miyota into Hi-Beat is possible?

[Reaps]

As title. anyone know?

Bonus if there's a direct drop or swap available

Or is this going to have to be a spacer + cannon pinion replacement + shenanigans?

 

[Geonor]

Does it have to be a skeleton movement? The only 28800 miyota-esqe movement I know of is the DG4813 which is a modified DG2813. It's kind of hard to find and most of the time when you find it, it's just a dg2813 instead from what I read.

A reliable way to get the high beat one is probably to get one of the Starking watches from AliExpress that uses them. They go on down to like $35 during sales so it's not a big investment for the whole watch even if you're just scavenging the movement.

https://a.aliexpress.com/_m0lyy1m

 

[Reaps]

It does not. Thanks for the link. Might have to buy one for cheap.

It's because the new Tudor FXD has the wrong beat rate. Fucking stupid.

 

[Teetertank]

Hi, I'm interested in this too (for an IWC big pilot that the rep factories for some reason used the slower beat movement in).
I was looking into possibility of swapping 8N-24 for Miyota 9015 which is a hi-beat.

For these movements, my comparison indicates:

Comparison	8N-24	9015	Compatibility
Movement diameter	11 1/2"	11 1/2"	Match
Movement height	5.55mm	3.9mm	9015 slimmer
Winding stem distance from dial	2.00mm	1.53mm	9015 would need spacer / dial dots
Hand spigots	(s)0.17; (m)1.00; (h)15.20	(s)0.17; (m)1.00; (h)15.20	Match
Dial feet	14deg & 40deg from center	17deg & 21deg from horizontal	Mismatch - chop feet & add dial dots

So the hand spigots match but the movement thickness of the 9015 is thinner, and it looks to me like the dial feet are in different places. I have never attempted this kind of mod but figure you could remove the dial feet and then fix the movement with dial dots.

This may result in a higher quality movement solution, but not sure how feasible this is.

Reaps: did you make any progress for your beat rate problem?

Will look into the suggestion of the DG4813 but would love to hear from anyone knowledgeable on this to understand how doable a 9015 movement swap would be?

 

[Reaps]

Hi, I'm interested in this too (for an IWC big pilot that the rep factories for some reason used the slower beat movement in).
I was looking into possibility of swapping 8N-24 for Miyota 9015 which is a hi-beat.

For these movements, my comparison indicates:

Comparison	8N-24	9015	Compatibility
Movement diameter	11 1/2"	11 1/2"	Match
Movement height	5.55mm	3.9mm	9015 slimmer
Winding stem distance from dial	2.00mm	1.53mm	9015 would need spacer / dial dots
Hand spigots	(s)0.17; (m)1.00; (h)15.20	(s)0.17; (m)1.00; (h)15.20	Match
Dial feet	14deg & 40deg from center	17deg & 21deg from horizontal	Mismatch - chop feet & add dial dots

So the hand spigots match but the movement thickness of the 9015 is thinner, and it looks to me like the dial feet are in different places. I have never attempted this kind of mod but figure you could remove the dial feet and then fix the movement with dial dots.

This may result in a higher quality movement solution, but not sure how feasible this is.

Reaps: did you make any progress for your beat rate problem?

Will look into the suggestion of the DG4813 but would love to hear from anyone knowledgeable on this to understand how doable a 9015 movement swap would be?

For sure dial dots have to be used. And then a spacer needs to be made (3d printed probably)

What I'm worried about is stem compatability with the crown.

Anyways this is a job for a modder. And right now I'm too lazy to do this mod haha. Thanks for the info. Let me know if you start the journey to fo this.

 

[Teetertank]

Is a spacer definitely required or would the dial dots hold the dial offset from the movement without any need for a spacer?

The stems on 8N24 and 9015 have the same diameter and pitch if that's what you mean, so should be compatible; not sure about DG4813.

The suggestion of Geonor to use DG4813 is great, and the video linked is excellent - this makes me think the DG4813 could be a good choice, just a shame that you end up with what is likely a lower quality movement than the rep version.

Main thing putting me off is the high initial cost for the watch I'm interested in which is $400+, so wouldn't want to mess it up attempting to fit a 9015 movement. I'll investigate some more and see what's possible.

 

[dnmtbr]

I just finished putting a 9015 in my black fxd. Dial spacer was not needed, the movement holder actually acts like a spacer once the movement is screwed into it. I had to clip and file the legs on the dial, and affix to the movement spacer using dial dots... but everything went back together perfectly.

 

[Teetertank]

I just finished putting a 9015 in my black fxd. Dial spacer was not needed, the movement holder actually acts like a spacer once the movement is screwed into it. I had to clip and file the legs on the dial, and affix to the movement spacer using dial dots... but everything went back together perfectly.

Hi, thanks for the response on this - sounds encouraging.

So just to clarify, you were able to swap an 8N-24 for a 9015 just using dial dots and the original movement holder that was supplied for the 8N-24?

Is it easy to align the dial once you've trimmed off the feet?

 

[dnmtbr]

Yep, swapped the 8N24 for a 9015 with no additional spacers, just dial dots. I've used dial dots before, so I didn't find the alignment difficult, but its certainly not as foolproof as being able to use the dial feet.

One thing to note is that my dial was really stuck to the 8N24 movement. I ended up snapping one of the dial feet off just getting the movement and dial separated. Also, you can separate the chapter ring from the dial too. Makes it a lot easier to get the hands off and file down the leftovers from clipping the feet.

 

[Teetertank]

Good to know. Thanks again for info. I'd be looking at doing this for an IWC without chapter ring, so hopefully the troubles with your Tudor may not apply, but based on your success I'm tempted to give this a go. I now have a new 9015 movement ready and waiting.

 

[dnmtbr]

Ah, yeah so YMMV with the IWC. This worked for me because the movement holder was the metal type that screws to the movement. The 9015 is thinner, so the screwing it into the 8N24 holder created the ~1mm space between the dial and movement naturally. You'd have to disassemble the IWC to see if that would be the same in your case. That said, it would really easy to make a spacer if you have a 3d printer, that was my original plan (to just 3d print a new movement holder that had the spacer built in).

 

[Teetertank]

So do you have a 1mm air gap between dial and movement? or is this filled by the dial dots? Also, would this create issues with installing hands in the pinions?

I was hoping the dial dots would create about 1mm gap to fill out the space required to align the crown.

I don't have a 3D printer but know one or two people that do.

Here's the movement holder in the watch I was planning the operation on. Does it look like it could work?

 

[dnmtbr]

Looks like it could work, pretty similar to whats in the fxd. and yeah, there is an air gap between the movement and the dial, but I didn't have any issues installing hands.

 

[dnmtbr]

To be clear though, the dial is touching the movement holder. Its technically glued to the movement holder with the dial dots. The movement itself is where the gap exists, but you wouldn't be able to see it without removing the dial.

 

[Teetertank]

Thanks again. So I looked up dial dot thickness and found a reference to 0.25mm thickness. Does that sound about what you used.

 

[dnmtbr]

probably about correct, i didn't measure those.

 

[macguffin]

So do you have a 1mm air gap between dial and movement? or is this filled by the dial dots? Also, would this create issues with installing hands in the pinions?

I was hoping the dial dots would create about 1mm gap to fill out the space required to align the crown.

I don't have a 3D printer but know one or two people that do.

Here's the movement holder in the watch I was planning the operation on. Does it look like it could work?

Did you wind up ordering the 9015 for your Big Pilot? I'm considering the same for mine, but I'll save myself the hassle if you discovered it wouldn't work.

 

[Hesekiel]

All I can say is this: the Tudor FXD replica from M+ comes stock with a Miyota 8N24, 3Hz movement. A fellow RWI member swapped in a 9015 4Hz movement without encountering any problems.

 

[Teetertank]

Did you wind up ordering the 9015 for your Big Pilot? I'm considering the same for mine, but I'll save myself the hassle if you discovered it wouldn't work.

I ordered a 9015 movement, but now need to source the watch!

If I make it happen, I'll report back.

 

[macguffin]

I ordered a 9015 movement, but now need to source the watch!

If I make it happen, I'll report back.

I think I'll order the movement. I have a Mr. Porter edition Big Pilot, and I feel good about it fitting. I'm sending the universe good vibes.