Jump to content
When you buy through links on our site, we may earn an affiliate commission.
  • Current Donation Goals

Movement case clamp torqueage


preacher62

Recommended Posts

This might not be the right board for this question but here it is anyway.

What is the formula for correctly tightening the case clamps on a ETA 2836 in a sub case. I have some that run great, but have found out recently that if you tighten it down you can compress the dial ring to far onto the movement and hose up the date changing and even slow the movement down.

On one that was running -10 sec/day and the date didn't change correctly, I loosened the clamp screws 1/4 turn and now the movement is running in the 1 - 2 sec range and the date wheel flips like it is supposed to.

Don't remember anyone ever commenting on this. Sometimes the bend in the clamp bar is just right and sometimes not.

Thanks!

Edited by preacher62
Link to comment
Share on other sites

Thanks for the response. I have backed the clamp screws off just to where the movement is stationary and used some blue threadlock on the screws. I think that this is a satisfactory fix.

On the accuracy...could be that the date flip is a symptom of the same problem. I'm just making this up, but I think that with the dwo mounted and the clamp tightened down too much it presses the date wheel slightly against the date change wheel under the date wheel, slowing the movement. I might be all wet on this as I have not researched it, but it could be. I think that it is on the dial side of the movement. I don't think that the clamps compress the movement, itself...that could really tear something up.

Thanks again for reply.

Edited by preacher62
Link to comment
Share on other sites

I am not really the person to answer the question, but my intuition says that if the case clamps are effecting the operation of the movement from a timekeeping perspective, then the effect would be more catastrophic than a difference of a few seconds a day... A few seconds a day can be the difference between resting the watch on its left side vs its right side overnight... if that makes any sense.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...
Please Sign In or Sign Up