sneed12 Posted January 3, 2013 Report Share Posted January 3, 2013 I had a couple of days off of work and decided to play with my AP diver a bit. As most of you know, the gen AP diver has a 21,600bph movement. Our reps come with an ETA 2824 (or clone) movement which beats at 28,800bph. If it had a 2836 movement, it would be simple to swap in a 2846, which is the exact same movement except with a 21.6 beat rate. However, swapping a 2846 for a 2824 is more difficult. It's typically doable (although the stem height is sometimes an issue), but the date wheel will not swap and with these AP divers have a custom date font, so using the stock ETA wheel is no good. Vac posted a thread in his section that seems to indicate that he's modified some 2846s to work with the 2824 datewheel, so I tried that for a bit. I swapped every single part on the front of the 2824 to a 2846, and it still would not work correctly with the 2824 datewheel. The teeth are not in the right plane. Some people report success so there apparently is a way to do it, but I couldn't figure it out and no one will share with me how it's done. So I decided to do it from the other side of the movement. In a lot of ways this is actually more desirable, since it gives you a movement with the correct stem height, you don't have to modify the date mechanism, etc. It is more delicate, fussier work though, and some of the parts are very easy to break. What I ended up with was a movement with all of the 2824 parts except the balance wheel, pallet fork, and escape wheel. The gear train is the same on all of the 28xx movements so nothing else had to be swapped. Now the movement beats at 21,600bph and nothing on the front side of the movement had to be changed. I didn't even remove the stem or uncase the movement. These are the parts that were swapped: I've transplanted these parts to the clone A2824 (you can see that the balance **** arm doesn't have the same perlage finish as the rest of the movement--this pic is through the loupe, that's why it's so weird looking) Better pic: Watch is now running at 21,600 bph. I didn't even have to touch the dial and hands or uncase the movement! The watch itself actually makes a pretty good movement holder for this project. Excited by how this turned out. Watch has been running within about 3 sec/day for the last day and a half, we'll see what it settles in at--the lower beat movements usually aren't quite this accurate over the longer term. Waiting on a new strap, I bought a Donerix leather, we'll see how it looks all together. 1 Link to comment Share on other sites More sharing options...
rogerthat Posted January 3, 2013 Report Share Posted January 3, 2013 Great to hear sneed! I posted a question not long ago curious if this was possible Would you be kind of enough to answer some questions via pm once I find the time to work on my similar setup? Link to comment Share on other sites More sharing options...
chiman12 Posted January 3, 2013 Report Share Posted January 3, 2013 That is awesome! Link to comment Share on other sites More sharing options...
asciwhite Posted January 3, 2013 Report Share Posted January 3, 2013 I actually like the more fluid sweep on the rep... But if you want to be "as close as possible to gen" this is the way to go Link to comment Share on other sites More sharing options...
wiesn089 Posted January 3, 2013 Report Share Posted January 3, 2013 Great work, thanks for the write-up! Link to comment Share on other sites More sharing options...
z3k0 Posted January 4, 2013 Report Share Posted January 4, 2013 Wow, great info ! This falls into "why-didnt-I-think-of-this" category Well, I guess it never occurred to me that 2846 and 2824 have identical gear trains ... Anyhow, I think this is by far the best way to modify diver movement to low-beat config. regards Link to comment Share on other sites More sharing options...
sneed12 Posted January 4, 2013 Author Report Share Posted January 4, 2013 Great to hear sneed! I posted a question not long ago curious if this was possible Would you be kind of enough to answer some questions via pm once I find the time to work on my similar setup? Would rather answer questions here in the thread... these forums are for sharing information, and someone else might have the same questions as you someday. Having said that, I posted pretty much everything you need to know. You need to remove the escape wheel (which means removing the plate that holds the gear train), balance assembly, and pallet fork. Then install the same parts but from the 2846. There is literally nothing else to it. Link to comment Share on other sites More sharing options...
sneed12 Posted January 15, 2013 Author Report Share Posted January 15, 2013 One is the modded low-beat, one is standard high-beat. Can you tell which is which? Link to comment Share on other sites More sharing options...
Inertiadrifter Posted January 15, 2013 Report Share Posted January 15, 2013 Right is low beat??? Link to comment Share on other sites More sharing options...
sneed12 Posted January 16, 2013 Author Report Share Posted January 16, 2013 Right is low beat??? Yep Link to comment Share on other sites More sharing options...
edgematic1 Posted January 16, 2013 Report Share Posted January 16, 2013 Yes, as said before, if you look at it you can notice the difference imo Link to comment Share on other sites More sharing options...
denis_sianto Posted February 13, 2013 Report Share Posted February 13, 2013 Are there any noticeable difference to the eye ? Link to comment Share on other sites More sharing options...
Vester71 Posted February 15, 2013 Report Share Posted February 15, 2013 You can tell the difference if you are looking for it. Link to comment Share on other sites More sharing options...
mbenz Posted February 15, 2013 Report Share Posted February 15, 2013 great work Link to comment Share on other sites More sharing options...
gran Posted February 15, 2013 Report Share Posted February 15, 2013 Great thread! This is my favorite watch during the summer. Link to comment Share on other sites More sharing options...
rvltn123 Posted August 25, 2013 Report Share Posted August 25, 2013 I had a couple of days off of work and decided to play with my AP diver a bit. As most of you know, the gen AP diver has a 21,600bph movement. Our reps come with an ETA 2824 (or clone) movement which beats at 28,800bph. If it had a 2836 movement, it would be simple to swap in a 2846, which is the exact same movement except with a 21.6 beat rate. However, swapping a 2846 for a 2824 is more difficult. It's typically doable (although the stem height is sometimes an issue), but the date wheel will not swap and with these AP divers have a custom date font, so using the stock ETA wheel is no good. Vac posted a thread in his section that seems to indicate that he's modified some 2846s to work with the 2824 datewheel, so I tried that for a bit. I swapped every single part on the front of the 2824 to a 2846, and it still would not work correctly with the 2824 datewheel. The teeth are not in the right plane. Some people report success so there apparently is a way to do it, but I couldn't figure it out and no one will share with me how it's done. So I decided to do it from the other side of the movement. In a lot of ways this is actually more desirable, since it gives you a movement with the correct stem height, you don't have to modify the date mechanism, etc. It is more delicate, fussier work though, and some of the parts are very easy to break. What I ended up with was a movement with all of the 2824 parts except the balance wheel, pallet fork, and escape wheel. The gear train is the same on all of the 28xx movements so nothing else had to be swapped. Now the movement beats at 21,600bph and nothing on the front side of the movement had to be changed. I didn't even remove the stem or uncase the movement. These are the parts that were swapped: I've transplanted these parts to the clone A2824 (you can see that the balance **** arm doesn't have the same perlage finish as the rest of the movement--this pic is through the loupe, that's why it's so weird looking) Better pic: Watch is now running at 21,600 bph. I didn't even have to touch the dial and hands or uncase the movement! The watch itself actually makes a pretty good movement holder for this project. Excited by how this turned out. Watch has been running within about 3 sec/day for the last day and a half, we'll see what it settles in at--the lower beat movements usually aren't quite this accurate over the longer term. Waiting on a new strap, I bought a Donerix leather, we'll see how it looks all together. I know, old thread, but I was curious: How did the accuracy turn out after it settled? Link to comment Share on other sites More sharing options...
Magic Posted January 11, 2014 Report Share Posted January 11, 2014 Dear sir, I've read your topic on the rebuild of a 2824 to a lowbeat and looking in to do the same: How did the accuracy tur out after it settled. I need to bring mine to a watchmaker since I'm not a watch maker ;( is it possible you provide me the parts or part numbers I need to order. In the picture I see more parts then you state. I see a balance wheel (+ bridge?) a Pallet fork a Pallet bridge and a escape wheel. Do I need to order all or is the balance wheel bridge and pallet bridge the same as a 2824? Thank you for your time and hopefully you can provide me the information Kind regards, Link to comment Share on other sites More sharing options...
JTZL Posted January 16, 2014 Report Share Posted January 16, 2014 (edited) Escape wheel: http://www.ebay.com/itm/Escape-wheel-spring-705-eta-2801-2-2804-2-2824-2-2834-2-2836-2-2846-/400292449599?pt=LH_DefaultDomain_0&hash=item5d334a0d3f Pallet fork: http://www.ebay.com/itm/Escape-wheel-spring-705-eta-2801-2-2804-2-2824-2-2834-2-2836-2-2846-/400292449599? pt=LH_DefaultDomain_0&hash=item5d334a0d3f Balance wheel : http://www.ebay.com/itm/Genuine-Balance-Wheel-Complete-Bridge-Calibre-ETA-2824-2-/231129644901?pt=LH_DefaultDomain_0&hash=item35d0667f65 I think it would be better off purchasing an ETA 2824-2 / ETA 2846 and taking out the parts out of the movement to make this mod more cost effective. Also i am considering getting the standard ETA 2824-2 date wheel. I've heard from other members that it will not fit due to the gear issues. Is that true? My only concern is whether the date cyclops is wide enough to display the date itself. Edited January 16, 2014 by JTZL Link to comment Share on other sites More sharing options...
sam1977 Posted January 17, 2014 Report Share Posted January 17, 2014 very cool post Link to comment Share on other sites More sharing options...
Ephry73 Posted March 3, 2015 Report Share Posted March 3, 2015 Wonder if the 2840 can be a donor for these parts as well. Link to comment Share on other sites More sharing options...
sneed12 Posted December 2, 2015 Author Report Share Posted December 2, 2015 I know, old thread, but I was curious: How did the accuracy turn out after it settled?Took a while to settle, but in the end got it regulated to within a few seconds / day Wonder if the 2840 can be a donor for these parts as well. Possibly -- not sure if they would fitNote that the 2840 has a nylon pallet fork and escape wheel... Link to comment Share on other sites More sharing options...
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