another escape wheel

[robdavidson]

Seems I keep running into broken escape pivots on old watches lately...  I am slowly acquiring a stockpile of donor movements and keep hoping to be able to use them but the escapes never seem to match.  Recent example is a Doxa with a ETA 1147/1080 movement.  Well Hey!, Ive got a couple  ETA 1080s around (doesnt everyone?), and lo and behold the 1080 escape is very similar..., but a bit longer than the 1147/1080...  And to complicate things it seems that the 1147 is a proprietary Doxa movement (havent seen it on any other brands) and not so cheap or easy to find either.

So I guess that my question would be, is there some reference for comparing parts across brands (say, ETA escape wheels).  And moreover are escapements particularly specific to their exact movements or is every little part this way.

[JohnR725]

there are several sources but this one is easy. Figure out who major watch find it in the list click on the part you're curious about ill get a cross reference. Then you also get a part number in case you want to purchase one and then you can go to the homepage of the company itself and do a search and if you're lucky they might actually have the part.

http://cgi.julesborel.com/

On 11/9/2022 at 7:27 AM, robdavidson said:

ETA 1147

so for instance the number above you get this link

http://cgi.julesborel.com/cgi-bin/matcgi2?ref=[\_DYHS

you'll notice on the list 1147 is listed but the 1080 is not it's not a cross reference.

the other thing that happens is like for the 1080 there is actually several different pivots styles for your escape wheel. Like straight shoulder or conical shoulder or occasionally get mixed one on the bottom one of the top C get a choice.

so here's going for the 1080 and the straight shoulder cross-references to a lot of watches way more than the other one

http://cgi.julesborel.com/cgi-bin/matcgi2?ref=ETA_1080

this is the unfortunate problem of watch repair they been made or very long time and there's a heck of a lot of parts and heck a lot of them do not cross reference to anything at all. Which means some assortments are nice and some assortments are not.

 

[robdavidson]

Fantastic reference, and thanks for clarifying the shoulder classifications.  I assume the specific shoulder is based on the jewel setting, or are they a bit flexible in their substitution?

[JohnR725]

6 hours ago, robdavidson said:

I assume the specific shoulder is based on the jewel setting, or are they a bit flexible in their substitution?

is another reference of cross referencing parts and that is the bestfit book. Those are what some of the numbers found on the website above basically are. So in the book the very beginning there is some reference material and I snipped out a image previously consists of a common question and you'll see it specific for the escape wheel.

then usually know you cannot swap whatever you feel like. the problem is the conical pivots will jam in a whole because their taper. See But a conical in a straight jewel because that's can be an issue it relies on resting on the end of the pivot to keep it in place. If you put a straight shoulder into a conical jewel even if it fits in doesn't rub on the shoulder the end of the pivot isn't properly shaped you have too much friction. So basically you cannot it has to be the right pivot the right jewel setting or it just isn't going to work.