Friday, September 10, 2021

WATCHMAKING BENCHES!

 WEEK 127

Michael
Origin : Malaysia 
Watchmaking class: Technician & Fullskill 
Current mood: I did some repairs and at the same time doing a private project from Yuriy regarding a small pinion stem that turns an inner bezel for zodiac diver watches. It was totally a new thing because the pinion that the watch has does not follow any watchmaking standard pinion shape and I have to shape the cutter and learned a lot regarding relieved cutters. Looking forward to next week for more micro mechanics.  


Renato & David
Origin: Zug, Zürich, Switzerland
Watchmaking class: Fullskill
Current mood: Did not initially think it would take that long, but... this one became a finishing week! At least the finish of my winding stem is 99% done :) It's good though, because this time is needed anyway to get experience with finishing tools and all the polishing compounds available. Tried out tetrabore and diamond based polishing pastes in various grades, as well as fine grinding papers. Application was done with brass, steel and different woods. I think I got it figured out to a high degree, but perfect results require a lot of experience. Each piece is individual and needs to be approached in different ways. It was a lot of fun experimenting and finding my own way to reach desired results. Quite happy, considering it's the first stem I ever made! Renato

This week I worked on the 8mm lathe. I was hand turning which was really difficult. The goal was the same as last week to create a conical pivot that matches a certain predetermined radius. Which is the same process when someone is making a balance staff. The curvature of the radius gauge, simulates the curvature of the burnishing tool edge. After a whole week I finally managed to finish the three pieces with; 1.0, 1.5 and 2.0 radiuses. David


Francesco, Åsmund & Robert
Origin: Italy, Norway, USA
Watchmaking class: Fullskill 
Current mood: This was the last week of heavy filing because I’ve finished most of the tools required for the grading. I’ve just finished the rectangular press fit plate. After filing a rectangle, I’ve made three holes with the drilling machine. After the lesson I started practicing with female cones at the Schaublin 70. It took a little while to find the right technique and how to hold the high speed steel graver in the correct way but at the end I’m happy with the result. Now I’m looking forward to learn the finishing techniques next autumn to finish all the tools. 
Have a nice weekend. Francesco 

Hello again! 

Last week me and Fransesco did the filing exam. Did the exam on Thursday and got the results on Friday and got very satisfied with the results. Made it a nice weekend! 

This week I’ve finished the balance bridge holder which were done in the lathe. Took a few tries before i got it to the right measurements.( note to self, always listen to the teacher and not the students 😂) - and started on the steel angular ruler which I’ve been working on for two days. It’s a time consuming task because you are moving back and forth from the bench and the profile projector to check that you are within measurements( +-0.08mm and +- 30 min ) and that the angles are right. I’m using a ball device to hold it and it’s very convenient to use for filing from all kinds of angles. 

Until next time
Åsmund


STEP 1:  BENCHES! (ALL)
Indeed very solid benches!




STEP 2: MODIFICATIONS! (MICHAEL)
In between servicing watches with ETA movements in preparation for his final exam, he got a special project to make a pinion and for that we decided to try to modify an existing cutter before ordering one, hopefully it will work out!



STEP 3:  FINISHING! (RENATO)
As Renato completed his first ever winding stem last week, he continued this week trying out various technics of finishing the different areas of the winding stem and got some nice results!


Not bad considering its the first winding stem he ever made!



STEP 4:  BOOKS! (RENATO)


For any Longines fan or collector this is a must have bible!!



STEP 5:  WATCHES! (RENATO)





















Another restoration project from Renato! One day this will be a beauty once again!






HENRIK's WORDS:


Thanks to a very nice person affiliated to the school, we got two watchmaking benches of really high quality! they will come in very handy soon and enable us to be even more flexible whenever needed! Thank you so much for thinking about the school!! Everyone got really excited upon the arrival of these benches, very solid heavy ones! Renato practiced a lot of finishing techniques on blue steel scraps and later applied some of those technics on his winding stem, it came out really nice! we mostly worked on similar  things as last week so not too much new, hopefully next week we can start with the manual milling machine the Aciera F1 and also some students will most likely go to EPHJ as well. Have a great weekend everyone!

Friday, September 3, 2021

FILING EXAM WEEK!

  WEEK 126

Michael
Origin : Malaysia 
Watchmaking class: Technician & Fullskill 
Current mood: I have been Bee-zy doing repairs for the whole week. Have to accumulate repair points to qualify for the final exam. Wish everyone have a great weekend! 


Renato & David
Origin: Zug, Zürich, Switzerland
Watchmaking class: Fullskill
Current mood: Took my time and worked on the winding stem this week. Always good to do it slow the first time and think about each step and how to do it best. Following pieces will go much faster then. Clear is, the more sharp gravers I have prepared before each stem, the better :) First winding stem is done, except for the finishing, which I started to try out on a test piece today. Hand turning silver steel with HSS gravers is quite time consuming and needs sharp gravers. Threading went fine with minimally bending the stem, while heat treatment worked well too without further bending. No need to bend it back, but I straightened several industrial winding stems that were bent successfully, which was a lot of fun. Looking forward to do the polishing of the stem as the last part next week! Renato

This week was the first time I actually got to turn on the 8mm lathe. I used the gravers I sharpened last week to create brass parts. The most challenging part was to try to turn round tips to match a specific roundness from a gauge. It only fit if the part was the exact roundness. David


Francesco, Åsmund & Robert
Origin: Italy, Norway, USA
Watchmaking class: Fullskill 
Current mood: This week I kept on with filing, in particular I focused myself on becoming faster and more precise during the filing, the measurements and the finishing. Those are essential skills for my next exam. 
Francesco.

This was a week in which a few more projects moved closer to completion, and I got a sense that things are starting to gel. I made a new baseplate for my balance bridge support, the original base went out of tolerance on the top and bottom surfaces as I was removing surface scratches with a coarse abrasive. Lesson learned: The center of the abrasive surface wore down faster than the edges, and as the baseplate was moved around the surface of the abrasive, the outside edges had more material removed from them than the center. Didn't notice anything out of the ordinary until the baseplate was moved to a finer abrasive, and the expected flat, even surface, was not in evidence.
Now working on a press-fit project, experimenting with various sizes for an interference fit.
What made the week even better, Wednesday and Thursday were perfect weather-wise.
Robert Gordon


STEP 1:  THREADING! (RENATO)
Renato threading his winding stem!

Making an iron basket for the winding stem to be in during the hardening procedure!

Cocooned winding stem!

After hardening, tempering and slot turning its now ready for the finishing stage!


STEP 2:  TURNING! (ÅSMUND)
Asmund turning a balance bridge holder conical pin.


STEP 3:  FILING! (FRANCESCO)
Francesco hand filing! 


STEP 4:  BOOKS! (RENATO)
Another nice military watch book on loan from Renato!



STEP 5:  WATCHES! (RENATO)













Here is some interesting info about the viper stamp; https://www.besancon-ville-du-temps.fr/la-vipere-ou-le-poincon-de-lexcellence/


Another nice pocket watch from Renato!





HENRIK's WORDS:


Interesting week! We had one visitor, a student from the United States who will be with us from January next year. Renato continued his winding stem journey and completed all the steps but without finish, next week he will practice various methods how to polish steel and then apply some nice shine to it! Asmund and Francesco had their filing exams this week, so lots of hand filing the whole week for them! Michael continued repairing watches to get ready for the final exam, David practiced the basic cuts such as cylinders with flat shoulders and sharp corners, convex and concave shapes, cones etc. on the 8 mm lathe by hand turning them. Renato showed us another really interesting pocket watch! Very interesting week we got! Have a great weekend everyone!