Jump to content

Kif/ shock spring sizing


quantieme

Recommended Posts

I have broken the lower shock spring on my eta 7750 balance so I ordered from cousins what I thought was the correct size shock spring for my eta 7750. It was listed in their parts as lower shock spring for eta 7750 part no inca97503, they have turned up but are miles to small their length being about 1.82 mm and my broken one being 2.36mm. I am really desperate could someone please tell me where to get the right size. Thanks 

Link to comment
Share on other sites

If I remember correctly the generic ones on cousins are available in multiple sizes. The movement itself seems to have the standard lyre shaped spring right ? You could try this option...

I wonder if, since the movement has been modified throughout time, the springs exist in various variants...

Edited by Chopin
Link to comment
Share on other sites

According to my "incabloc" catalogue for the Valjoux 7750 the following applies:

Upper spring Ref No. 170.03  = Length 2.31  Width 1.55

Lower spring Ref No. 975.03  = Length 1.83  Width 1.38

 

Cousins supply the lower jewel ref no. INCA 97503

 

Are you sure it is not the upper spring

 

Link to comment
Share on other sites

1 hour ago, clockboy said:

According to my "incabloc" catalogue for the Valjoux 7750 the following applies:

Upper spring Ref No. 170.03  = Length 2.31  Width 1.55

Lower spring Ref No. 975.03  = Length 1.83  Width 1.38

 

Cousins supply the lower jewel ref no. INCA 97503

 

Are you sure it is not the upper spring

 

I think you are right it is the upper spring because I roughly measured it at 2.36 so that more or less ties in with the 2.31.

thankyou for that information, where did you get the sizes from because I couldn’t see any on the cousins listing, it just specified upper or lower.either way I am so grateful because it would have bugged me all night.

Link to comment
Share on other sites

1 hour ago, Chopin said:

If I remember correctly the generic ones on cousins are available in multiple sizes. The movement itself seems to have the standard lyre shaped spring right ? You could try this option...

I wonder if, since the movement has been modified throughout time, the springs exist in various variants...

I think I ordered 5he wrong one, I ordered lower when I should have got upper, thanks for the input though.

Link to comment
Share on other sites

21 minutes ago, quantieme said:

I think I ordered 5he wrong one, I ordered lower when I should have got upper, thanks for the input though.

I have their catalogue. I believe the information is also available in the Cousins "downloads" section.

Link to comment
Share on other sites

1 hour ago, quantieme said:

I think I ordered 5he wrong one, I ordered lower when I should have got upper, thanks for the input though.

Seems that I was wrong which is the upper and which is the lower one when you asked here on the forum a few days ago. My apologies @quantieme . I think the logic is as follows: upper is the side you see when you've just removed the case back and lower is the one "beneath" the incabloc system that you get to see after you take it all apart.

Edited by Chopin
Link to comment
Share on other sites

14 hours ago, Chopin said:

Seems that I was wrong which is the upper and which is the lower one when you asked here on the forum a few days ago. My apologies @quantieme . I think the logic is as follows: upper is the side you see when you've just removed the case back and lower is the one "beneath" the incabloc system that you get to see after you take it all apart.

That’s ok at least I will remember for the next time.

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • That will mean dismantling the gear train, which with 5 pivots to align was a pain. Probably going to have to though. I'm convinced it's something to do with the great wheel. 
    • As far as I know, the only time an epilame treatment has potential drawbacks is when something is rubbing on the treated part w/o lubrication in between creating abrasive dust. That is, I don't believe in the method of "running the watch to make a groove through it first in the pallet stones where the lubrication is then placed". So, I think the rule would be; do not epilame treat parts where rubbing is going on without lubrication. Other than that I don't think we have anything to worry about. That said, I'm not an expert, and I'm always happy to learn more. Has any other repairer than Alex suggested or explained the "making-a-groove" method? My impression is that it's just something he constructed in his mind. I have not perceived it as a generally practiced method. Again, I could be wrong!
    • Post some pictures , some good close ones of the parts you've described. 
    • Ive never used epilame H only information i have read and mentally stored about it mostly from Nicklesilver here and elsewhere ( the fork horns thing ), maybe the residue powder that is removed has some grinding effect ? So probably a good idea to limit its application areas to only the absolute necessary. Yes as far as i know epilame rubs off relatively easy, the technique of running the watch to make a groove through it first in the pallet stones where the lubrication is then placed. This i understand creates the barrier for the lube to sit up to. If i can find a good balance of pros and cons of its use then thats one process i can avoid by using a thixotropic lube on the stones. The epilame i would say allows for a more fluid lubrication to be used that would increase amplitude on low beat movements. The stearic acid powder is extremely cheap, the problem is the fuming process to coat parts, is not selective , the whole part has to treated in this method. If epilame residue can cause wear then thats not good, if I remember the conclusion was not proved entirely just a general assumption between watchmakers. The thread is out there somewhere, the same discussion is also old on a facebook group. Ive never used epilame H only information i have read and mentally stored about it mostly from Nicklesilver here and elsewhere ( the fork horns thing ), maybe the residue powder that is removed has some grinding effect ? So probably a good idea to limit its application areas to only the absolute necessary. Yes as far as i know epilame rubs off relatively easy, the technique of running the watch to make a groove through it first in the pallet stones where the lubrication is then placed. This i understand creates the barrier for the lube to sit up to. If i can find a good balance of pros and cons of its use then thats one process i can avoid by using a thixotropic lube on the stones. The epilame i would say allows for a more fluid lubrication to be used that would increase amplitude on low beat movements. The stearic acid powder is extremely cheap, the problem is the fuming process to coat parts, is not selective , the whole part has to treated in this method. If epilame residue can cause wear then thats not good, if I remember the conclusion was not proved entirely just a general assumption between watchmakers. The thread is out there somewhere, the same discussion is also old on a facebook group. If its a potential problem for amateurs to use then i would prefer not to take the risk .
    • Following on from my question about identifying screws in the AS2063 movement that basically fell out of the case in bits, I’m pleased to report that I’ve got it all back together, and the movement is running pretty well.    But… There’s something wrong with the keyless works and hand setting. It’s fine in winding and quickset date position - these work - but in hand setting position winding the crown turns the whole gear train.  I don’t really understand how it’s meant to work. It doesn’t have a traditional friction fit cannon pinion.  The second wheel is unusual with a pair of smaller pinions on it, which seem to interact with the barrel and the motion works.    Could this be the problem? I must admit I just cleaned it and popped it in place when reassembling the gear train. I’ve lubricated the pivots but didn’t do anything to the extra bits on the second wheel.    Does this make sense and is anyone able to figure out what I’m doing wrong? Thanks in advance, as always.    ETA - the parts list calls it the Great Wheel, not second wheel. 
×
×
  • Create New...