I am working on a vtg. Citizen cal.7520 automatic movement.
I have put the watch on the timegrapher
The graph looks OK but the beat error shows 9.9ms. I presumed that beat error should be around 1.0~2.0 given the shape of the graph.
Is the beat error actually bad or the timegrapher is wrong??
Padd here from the UK.
It all started with a desire to fix a Submariner replica I bought off a lucky lucky man in Pisa, Italy while on a European tour.
Next thing I know I'm investigating Submariner replicas and building my own, signed by me, using a Seagull ST2130 movement, adventure watch.
Now I'm hooked, I took inspiration from Marks videos, now I'm happily starting to work on parts of the movement, and have recovered one or two movements where the stem came out, but wouldn't stay back in. I have built a few watches for friends and relations, but now I need to be able to service them when they come back to me.
I also have a couple of movements that run really badly, so I will be practising on those over the winter weekends. Full repair/servicing kit IS my Christmas present.
I really want to get one of those ST2130's, serviced and tweaked by me, doing a -------------------------- on my timegrapher. not a -.'-.'''--,'.'.' (and worse) that they do at the moment.
I wont start to list my watch collection, but it runs from a Casio digital to a Rolex pocket watch with Seikos, Citizens, Omegas and home builds in the mix.
Must do Mark's course, but I'm afraid I may have already learned 60+% of it already.
Looks like a flat crystal, easy to get and replace. You can find the part, as well a press and digital calipers on Ebay. You can also fit a sapphire crystal for few dollars more. The cheapest place to buy is Alixepress if you don't mind a longer shipping time.
The small motor, copy of Foredom, found on any online platform, is perfect. Then an assortment of hard felt wheels, mandrels for paper and small wheel, and compounds.
BTW we have a section dedicated to discussing tools, as well one where it's considered polite to introduce oneself. You may ask mods to move your post using the report flag top right.
OP, please do not transform this piece in a casualty of your curiosity.
You have been given a lot of relevant information but there is a great difference between theory and practice, which you shall discover by learning first on something of small monetary value and that is not part of your family heritage.