• The NAWCC Museum and Library & Research Center will reopen starting Wednesday, January 6, 2021 as per Governor Wolf's reopening mandate.

Hairspring bent out of flat

V

VergeMan

Guest
I have a hairspring bent out of flat and even after reading Fried's Bench Practices am not sure how to locate the twisted area of the spring to bend it back into flat plane. Any suggestions?
 

Don Dahlberg

Registered User
NAWCC Member
Aug 31, 2000
3,425
17
38
Examine the hairspring starting from the collet. When you find the first ring of the hairspring that is out of flat, then find the location on the ring that is the farthest out of flat. The problem is 180 degrees before that location. Go to that location and using two sharp tweezers twist the hairspring back to flat.

(For out of round problems, the problem is 90 degrees earlier.)

A good way to practice is to take a bad hairspring and bend it and then bend it back to the way it was. You then get to see the action that caused the defect and the counter action that returns it.

In class, the instructor would give us bent hairsprings and we had to true them. Then he would bend it again in a different way. Practice, practice, practice.

Don
 
V

VergeMan

Guest
guychampeau said:
what do you mean when you say...."the ring farthest out of flat"
thanks
This is the point of the hairspring that is the greatest distance out of flat away from the plane of the hairspring.
 
V

VergeMan

Guest
Don said:
Examine the hairspring starting from the collet. When you find the first ring of the hairspring that is out of flat, then find the location on the ring that is the farthest out of flat. The problem is 180 degrees before that location. Go to that location and using two sharp tweezers twist the hairspring back to flat.

(For out of round problems, the problem is 90 degrees earlier.)

A good way to practice is to take a bad hairspring and bend it and then bend it back to the way it was. You then get to see the action that caused the defect and the counter action that returns it.

In class, the instructor would give us bent hairsprings and we had to true them. Then he would bend it again in a different way. Practice, practice, practice.

Don
Thanks for you expert guidance, it seems to be working!!!
Thanks a million!!!