RWG Technical

I have seen some bizzare things with the A7750's... I remember washing 2 movements and simply mixing up all the parts in the baskets, it didn't matter as they were identical movements...right?... WRONG... I found out the hard way, the parts were all slightly different, I didn't get into counting all the wheel teeth, but not one of the wheels fit in the jewels in each mainplate and it took me hours to get all the parts in their respective corners. I have also had similar train, balance, problems with older rollie's, i.e. a 18K train with a 19,8K balance, or vice versa, a real mess to sort out. Also check the pallet stones, they tend to be loose and could mess up the reading on the pickup of the vibrograph.

Yes and no, lower amplitude can mean shorter swings and a faster rate, but you are not considering the position of the regulator pins and the position of the hairspring when the movement is placed in different positions...that is more critical than the swing length, after all our balances and hairsprings are designed to have isochronosime between full wind and unwound. So, lets say in the DU position the regulator pins are touching the hairspring all the time, and it's running +20 sec/day... Now, you move to the CD position, the amplitude is supposed to lower, but at the same time, the hairspring is not touching the regulator pins because of gravity, or only partially touching the pins as the hairspring winds up and unwinds...what has happened? The effective length of the hairsping has increased, increased hairspring length = slower vibrations... So it's possible, you have to look beyond the readings and check out the regulator, I suspect you will find your answers... (hint, use a 10X loupe and watch the regulator pins where the hairspring passes through it, look carefully in all positions to see what is happening). Good luck.

All mineral glass crystals and sapphire ones are pressed in with a compression ring. Some older watches have them glued in, but not modern watches. On some models the crystal is inside and below the bezel, and you have to remove the bezel before you can remove the crystal, many AP's are like this. On any Tag I have worked on, the crystal presses out the normal way. Anyone telling you that you need to heat up the case to remove the crystal, is wacked, wonder if he was going to use a torch and I wonder how well the bezel would survive the treatment, or the rest of the non metal parts of the case...

You are correct. It was lumed the same as the genuine reference pictures you sent in and turned out great, wait until you see the Slevin...wow, it's really nice!!

That's your answer...the tooth count either in the pinion or the wheel is different than the Asian one. Overall the ratio would be the same btwn an ETA and an Asian 7750 @ 28.8k, BUT, the ratio's between each of the wheels is most likely not the same...

Agree...but many think otherwise, equating low price with quality service, that may work with some items, but not watchmaking... If your "Price shopping" I can't help you out, sorry. Although there are plenty around who will meet your "...alot cheaper..." criteria.

The parts are very small on that size of movements and it would be a real challenge to make them. Given it's a recent movement there is no need to fabricate new ones anyway.... ETA makes a large variety of lenghts and there are some that are really long, so replacement with new parts should be the solution. The biggest problem with this type of swap is always the location of the stem, it doesn't line up with the case tube and is the no-go issue and not correctable.

I have a 616 sitting here in it's original case, with original dial and hands, fully serviced, in pristine condition with a non-branded ratchet gear, ready to go...if your interested...

$100 for the set. You supply the original parts, I do the modifications. Turn time, less than 2 weeks...

Actually...I didn't cut new teeth on the hour wheel, I cut OFF the old pipe, fabricated a new one, and brazed the new pipe to the old hour wheel gear... How's that for craftmanship? Now I have you thinking don't I...

Many times when you are making a custom build, the dial is much thicker than the original dial, and you need longer cannon/hour wheels to allow the hands to clear the dial. Buying new parts would be the easy solution, if they were available... since they are not available, the solution to the problem is to fabricate new parts. Here's an overall view of the Cannon pinion and Hour wheel from a Cortbert 616 as delivered, as you'll see further down, they are much too short for our new dial thickness... As delivered The specifications were to raise the cannon pinion and hour wheel (2 sets) high enough to clear a 1.7mm and 2.7mm dial thickness respectively. I am not going to show all the machining and fabrication steps required to make these new parts, it is a lenghty, time consuming, and demanding process, with tolerances in the +- 0.01mm. I will show the end results of my efforts, I hope you like it and find it interesting. ORIGINAL on the LEFT, NEW on the RIGHT Various views of the longer cannon and hour wheel pipe. Here are the two new sets all finished and ready to send out. Thanks for reading.

How did you miss this review? A7753 review and this one... 4 year old A7750 review and this whole section devoted to these type of topics... Movement reviews - lots of them...

I won't be back until the 18 December, note that my PM is shut off.

My condolences on your loss.

Excellent news indeed. We have a habit of needing to see the oil we apply, which you can actually see even in very small quantities if you know what to look for, but it's normal to over oil the movement initially. It's running, which is more than a lot of people can say, congratulations on a job well done...

Interesting outcome... It may be worth soaking the balance and hairspring in One-Dip for 10 minutes and drying fully, just in case there is some oil on the hairspring. Sometimes these hairsprings fix themselves, especially if the movement is allowed to run down...

Since your other post asked for "cheap lume" and in the UK, I can't help you with either of those requests. "Cheap" and quality watch work, be it lume, servicing, whatever, don't go together. If you're price shopping, you will get exactly what you pay for...

TAG is probably the worse...plastic movements no less....and really cheap ones... The movement in that particular model is worth less than $20.00, talk about markup, holy crap. For Sale at the ofrei site ESA F06.111-D6 Ligne Size 11 1/2, height 2.50, hand sizes 70/120/20. Date at 6, 3 jewels. ESA F06.111-D6 $19.90

The simple answer is that the crown isn't disengaging from the stem as it should. It could be a stem slightly too short, but you have to be careful you don't make it too long as you risk damaging the crown/tube from the extra tension when screwing it down. It could also be that the crown sprung clutch is poorly made and not disengaging from the stem. Given that you don't have any other issues, and that you only turn the crown a couple of turns when you screw it down, if it was me, I wouldn't worry about it, as long as it's done slowly, your not going to damage anything...

If you only checked it dial up, you didn't check if the hairspring is possibly touching itself, or something else... Try timing it DU, DD, and CD and see what it shows, there is only one reason for it to run fast, that is a hairspring becoming shorter and vibrating faster...

Hey, it was my idea, come up with your own cash cow....moooo.... The majority of the ETA parts are not interchangeable on the Asian models, there are a few that will work, but I know for sure that the reversing wheel isn't one of them. The problem I had was the pivots on the ETA reversing wheel were too large to fit into the Asian jewels.

I forgot how good this one looked, it's a great piece, thanks for the bump...

Is this what your thinking of? w0lf, it looks much better, being re-tested after assembly...

Lots of crap doesn't constitute value, 1 meaningful informative post is better than pages of junk.

Because it's based on the Asian 7750 series, which we have had for over 5 years, I think it's going to be a decent movement. Only serviced 1 so far, but I have another one here for service, I'll post the results when I am done... Thanks for the positive feedback everyone.