Jump to content

Recommended Posts

Posted

Hi all,

I managed to get my hands on a vintage 1972 Tissot Seastar Automatic with a 794 movement. It's given me a few challenges along the way with the calendar mechanism and no technical sheet to refer to but I seem to have overcome everything until the last part of the assembly. The date wheel is advancing fine now, as does the day disc when light pressure is given with pegwood when I rotate the crown. However, my question is, what holds the day disc centralised and in place? I've worked on an ETA 2836-2 date/day mechanism, and on this, a circlip held the day wheel on. The design suggests with this one that the dial alone will provide enough pressure to hold it in place though I'm not convinced. I've invested in a new date ring and day disc due to the originals being badly damaged.

Has anyone worked on one of these old Tissot movements before who could kindly offer some advice on fixing the day disc please? Photos of the job added.

Many thanks,
Adam

20200613_002612401_iOS.jpg

20200615_225149464_iOS.jpg

20200615_225513939_iOS.jpg

Posted
4 hours ago, AdamC said:

However, my question is, what holds the day disc centralised and in place? I've worked on an ETA 2836-2 date/day mechanism, and on this, a circlip held the day wheel on. The design suggests with this one that the dial alone will provide enough pressure to hold it in place though I'm not convinced.

Yes that is very common with Swiss mov.ts, a thin brass washer goes between the hours wheel and dial, otherwise the day disc takes its place. 

  • Like 2
Posted

Thanks JDM. So essentially I’ll fit a dial washer before fitting the dial.


Sent from my iPad using Tapatalk

Posted
Do you have the dial support ring. 

Yes, I have the plastic dial support ring and (I think - see photo before disassembly)2c5f36697ee2cdc5e8632c0441fc813c.jpg&key=92754e33815abce315385fd210a14cf699700a430830210a653059b2b60128b8everything else , thanks Nucejoe. Unfortunately no dial feet so am fitting dial sticky pads https://www.cousinsuk.com/product/dial-spots-strips secure as recommended by someone. Then just the auto rotor to fit and hopefully I’m done.

 

 

Sent from my iPad using Tapatalk

Posted
Dial ring looks good. 
Don't pads raise the dial plate higher?   

That’s my fear now. The pads are 0.4mm thick so I won’t know till I try


Sent from my iPhone using Tapatalk
Posted
Pads are always an agly hack, I try would find someone to resolder the feet. 

I agree jdm. I do have a soldering iron for electronics but fearful of damaging the dial. Looked on eBay without luck for a flat one with diameter 29.5mm without success :(


Sent from my iPhone using Tapatalk
Posted
7 minutes ago, AdamC said:


I agree jdm. I do have a soldering iron for electronics but fearful of damaging the dial. 

It's a valid fear. Watchweasol has the plans for a machine, maybe he will post the details. You can try a dial washer too.

  • Like 1
Posted
You could use JDweld to glue some dialfeet on. I guess Cousins has these, I bought mine at Boley.

Do you mean J-B Weld epoxy? If so, I can obtain it from Amazon. Sounds feasible.


Sent from my iPhone using Tapatalk
Posted

Its quite difficult to glue feet back on but heres a tip.

I usually do it first  before assembling. What I do is fit the feet back in a bare movement so that they stick out a bit equally, then dress the tips so that they are flat, Next Apply some JB weld to the dial where you want the feet to go .. sighting thru the hole in the middle of the dial to ensure you get it really centred. Use blobs of rodico on the edges to ensure the dial stays level. If you like you can reattach the centre wheels, canon pinion/minute wheel to ensure that the dial is really centred. Leave it overnight or longer and then remove dial from movement .

Good luck

Anilv

  • Like 1
Posted

Hi   Adam     The offer still stands, If you PM me your address  I will dig out the plans for you and post them down.  I will see if I can get them onto the site as well.    cheers

  • Like 2
Posted

Hi Adam  If you search on the site in "watch repair tools and equipment there is all the details I posted in Oct 4th 2019.    and  google      "dialfoot soldering machines" i t will give you lots  of the Including the original Wesley R Door drawings.   cheers

  • Like 1
Posted

Brilliant watchweasol! I’ll take a look at that. Thanks for all your help.


Sent from my iPad using Tapatalk

Posted
On 6/16/2020 at 10:44 AM, AdamC said:


Do you mean J-B Weld epoxy? If so, I can obtain it from Amazon. Sounds feasible.


Sent from my iPhone using Tapatalk

correct, I used it for some dialfeet, make sure you sand the dail at the position of the dialfeet

  • Similar Content

  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • Interesting, thanks for the detailed post. I saw one of those Swiss Nano machines a while back in another youtube video from  the Weiss Watch Company.
    • Hello and welcome to the fo4um. Enjoy
    • Welcome to the forum, enjoy.
    • You're asking a pretty broad question and you didn't specify the machine but yes it's simple especially if you have the right machine. The question has problems but I'll take it as it is. Is it really that simple yes especially if you have the right machine. So in the video below he's making a screw and yes it really is that simple but pay attention to the machine it is not simple at all probably wasn't cheap but it is small it will probably fit in your garage. Unfortunately wouldn't fit in my garage as it's far too cluttered up with things. In the video he talks about making a screw and pay attention to the machine. The machine has lots and lots and lots of cutters and lots of things to do lots of machining all-in-one machine conceivably one step after another all programmable. If you look at his channel lots of CNC's stuff and there are several other videos related to this machine. He goes to the factory where they talk about it and show all the other machines they make in Switzerland.  I did look up the specifications the machine I don't recall the price it's not going to cut wheels I think it has a maximum diameter around 11 mm basically it's really good for making small diameter watch parts. Then in one of the other videos he goes to a factory that used to make parts with waterpowered machinery been in business for 100 years and everything they now make is made with CNC machines including this one. What was interesting with the factory photo was that when they make some parts they can put them on a optical comparator comparator compares with whatever the reference is and the machine can be programmed to adjust its cutting to make sure everything is actually being made to specifications. Oh and then somewhere in all of this there was at least one picture of a balance staff can't have a CNC Swiss machine without making balance staffs.   It would be really nice if we had pictures of the machine. Then yes if you look at the page for wheel cutting you can enter parameters and it will generate a G code but he left out things? Notice he has a picture of a complete wheel but the G code isn't making a complete wheel it's only cutting the gear teeth I don't see whereas the program for crossing out the spokes? Typically when you see people cutting gears once the teeth are cut most the time the spokes are cut by hand. Occasionally someone will mill them out but typically not with the program which seems strange if you have CNC capability for instance one of my friends fill it used to design assembly line equipment or things to make things. So his hobby was to continue to make tools to make things like clocks. Very interesting and clever clocks but his true fund was making the machines to make the clocks. Then machine is not controlled by G code like we would typically find today as the stepping motor controller he has was made a long time ago and the individual controllers used a textbased program. So the company had a editor you could write a program to cause each the stepping motors to do something. So basically once you figure out how to cut a gear he would just change the parameters for different size gears so here's an example of a gear as you can see we have the teeth and the spokes. Then we have a picture the machine which sucks because it would've been so much nicer if I could've taken a picture when it was cutting a gears so we can see things better. Then yes there is a worm gear stepping motor indexing this is a mini lathe and the indexing is at the end of the lathe head hiding. The basic operation of this machine would be brass sheet not cut to a specific diameter size not even round mounted on the machine. Then it turns and a milling cutter will cut the diameter. Then the gear would be cut with a gear cutter. The same mill cutter for the diameter although conceivably change the size I don't know but basically the same milling for cutting the outer diameter would be used to cut the spokes. I really can't remember how he did the center hole but whatever it was was very precise.          
    • Yeah I know the site and the creator of it.  the two video clips are good examples of the quicker method and a full tear down.  the quick method will work in many cases. But not always and not for all the different movements.  I strongly suggest to not bend the four tabs as was done in the first clip.  Instead there are three tabs that insert into the top plate, Much saver way as to not break a tab.
×
×
  • Create New...