Jump to content

7750 Asian clone accuracy

Bauertime
 Share

Recommended Posts

Bauertime Watch Enthusiast

Bauertime

Posted
Posted

I put together 3 7750 clone watches and one seems to be one of the most accurate mechanical watches in the world. I know that's a big claim but would you consider 3 sec. in 4 months to be good? To be honest it has deviated as much as 17 sec. during this time. At the end of the first month it was 3 sec fast. At the end of the second month it was 3 sec. slow. At the end of the third month it was 4 sec fast. At the end of the forth month it was 3 sec fast. I wear the watch every day and I do not take any special care when doing work around the house. It seems to getting even more stable. The other two watches keep good time if I put them on at the same time each day. But if I wait like two hours longer one day than the day before they loose like 10 sec. But this one watch does not care how much you over sleep on the weekends, it will be within a sec of the day before. Like I said if it does drift a little during the month it seems to know when the end of the month is coming and it will drift back to where it started at the beginning of the month. I oiled these movements with 9010 to the jewels I could reach with out taking it apart. I also put 9010 on a few teeth of the escapement gear. Every night when I check it against my atomic clock I just am amazed. I just know its going to like 25 sec off one of these times like other watches I have timed. But no it's always almost dead on. If anyone knows of a contest of watch accuracy let me know.

 

 

 

  • Like 1
Klassiker Distinguished Member

Klassiker

Posted
Posted
33 minutes ago, Bauertime said:

seems to know when the end of the month is coming

Spooky. Could it be an in-tune-with-the-Moon-watch?

36 minutes ago, Bauertime said:

If anyone knows of a contest of watch accuracy let me know.

The Swiss used to hold these, until Seiko started winning, then they took their ball away.

Klassiker Distinguished Member

Klassiker

Posted
Posted

It's very impressive performance for sure, but it is the repeatability and consistency which is unusually good and inherent in the movement, not the accuracy at the end  of the month, which I think you'll agree was just a matter of luck.

Do you have timing machine results in all positions? They would be interesting, last thing in the evening and first  thing in the morning.

You do seem to be inordinately concerned. Just give yourself a pat on the shoulder and enjoy it while it lasts.

toptime810 WRT Addict

toptime810

Posted
Posted (edited)

Get rid of that crap movement spend the money on a real movement. Accuracy might be there but there’s no quality of those movements

Edited by toptime810
More words
jdm Distinguished Member

jdm

Posted
Posted
9 hours ago, toptime810 said:

You will understand in 6 months what quality means

Sounds like a mix of an unfounded prediction and jinx casting.
Chinese mov.ts of a same type may come in different grade.
Anyway I whish better for the OP's watch.

toptime810 WRT Addict

toptime810

Posted
Posted (edited)

It means material the mechanism is made with. Those are made with cheap soft metals. There is no precision in the fitting of the parts when the wheels meet it is loose not a tight fit like Swiss. Have you used harbour freight tools? That’s what a Chinese movement is compared to. It works for awhile but will eventually fail and will not be repairable. When Someone ask is I can fix one I tell them to just replace it. No point in repairing them. Like a pocket Ben it’s a throw away movement

Edited by toptime810
More words
dadistic Distinguished Member

dadistic

Posted
Posted

I have dollar watches that I have restored, because I like them and wanted examples from an important part of watch history.

I'm glad whoever owned them originally did not throw them away, even though they weren't considered "repairable".

I don't sell watches or services at the moment, but have lots of watches with "cheap" chinese movements in them. So far no problems that I can't take care of myself, but then again these watches don't see the use that watches used to get.

Maybe they will wear out like my 50 year old TImex watches, and have to be thrown away 🙂 (Just kidding, my Timex's are just fine).

Cheers!

  • Like 2
  • 2 months later...
PostwarO27 Watch Enthusiast

PostwarO27

Posted
Posted
Quote

I do not have a timing machine. I use a 20x stereo microscope to adjust timing.

Ha...I do as well.  Don't have a timegrapher but I have a Dino-Lite digital microscope with a comparator feature on it.  I center the impulse jewel between the banking pins with in .002 in of center with it.

Its a pain in the but to set up, but in the end it gets the job done.

Nibbler WRT Addict

Nibbler

Posted
Posted

I too was impressed with the 7750 clone accuracy. We will see if it lasts. I have had mine for like 6 months. The chronograph start and top function is a little chunky feeling but everything else is ok. I have 2 of these.

They are no where near the quality of some of the name brand watches I have including Seiko.

Mileage may vary.

Matt

 

jdm Distinguished Member

jdm

Posted
Posted
9 minutes ago, PostwarO27 said:

Ha...I do as well. 

Just FYI, we have a section here where it's considered polite for new members to introduce themselves first. 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing

  • Recently Browsing

    • No registered users viewing this page.

  • Topics

  • Posts

    • caseback
      A lathe with indexing that won't break the bank?

      By caseback · Posted

      I believe @nickelsilver has a setup like that.
    • LittleWatchShop
      A lathe with indexing that won't break the bank?

      By LittleWatchShop · Posted

      I posted pictures earlier in this thread. My lathe and mill are two separate instruments. I think I have seen examples of putting a milling head on a lathe bed...but not certain.
    • Rocco
      Watch of Today

      By Rocco · Posted

      Timex Camper, September 1994, new to me. Strap is an old perlon with "Germany" in script etched into the resin on the tail end. Not Horlon or Eulit I believe. History unknown, running strong, losing less than a minute a day. Goals for this: Wear it a ton! Buy crystal lift, clean out the gunk around the ring and under the crystal Eventually swap into a stainless steel case. I've seen a member who has swapped a Timex mechanical movement into the Timex J.Crew quartz field watch case.
    • JohnR725
      A lathe with indexing that won't break the bank?

      By JohnR725 · Posted

      One of the problems we would have with a watchmaker's lathe is they were made over considerable span of time and manufacturing in the early days probably wasn't as good as it was today. Then if you look at the older catalogs typically it was just the head a few collets and something to rest graver on. So basically a basic lathe with over time things acquired but acquired things may or may not fit. Order today you purchase a used lathe that all kinds of nifty bits and pieces from a seller that acquired from? This would come back to that the basic watchmaker's lathe was used for basic watchmaking like turning things with a hand graver. Then limited indexing is fine because you can make things like stems Which don't need a whole bunch indexing   In the link above the word vector is mentioned and at the link below you can purchase one. Then of course you're going to need the motor that's a little bit extra for the price. https://www.hswalsh.com/product/lathe-vector-watchmakers-48-collets-hl11. That you're going to need some bonus parts like these found this picture online show the classic way of classic gear cutting.   The lathe could have a much bigger indexing disk but it has to be mounted close to the edge. Otherwise you're going to have a whole bunch of smaller disks like this which I think has notches rather than holes. Then as wonderful as these pictures look actually cutting a gear with this is not entirely fun. Look at all is belts all pulling on things and this is a watchmaker's lathe lightweight with lots of bits and pieces attached. It would make more sense if you actually cut a gear with something like this and it tends to be it's not really the best way to do it looks nice on paper but it is not the best way to go. Reality for cutting watch parts would be a bigger machine is much better. Than getting rid of all those belts and pulleys also good. Here is an interesting channel I would've liked of found a different video but this was nice and short if you look at his video as he uses a stepping motor and worm gear assembly for the indexing plate. In this particular video it gets attached to the lathe at about one minute and seven seconds and it looks like it's hiding looks like he has a Sherline. I do know he's had other stuff you'll just have to go through his videos to find it. Then at about one minute and 22 seconds you find out if you set up things appropriately. It's always bad we end up with half a tooth at the very end. Then you will note big lathe yes he's getting a big gear but you could easily cut a watch gear with the setup. And it definitely way more stable than a watchmaker's lathe.         Oh here's a company they been in business since 1911 http://www.fwderbyshireinc.com/  
    • RichardHarris123
      Hello from the Philadelphia area

      By RichardHarris123 · Posted

      Hello and welcome from Leeds, England. 
×
×
  • Create New...