• Upcoming updates
    Over the next couple of weeks we will be performing software updates on the forum. These will be completed in small steps as we upgrade individual software addons. You might occasionally see a maintenance message that will last a few minutes at most.

    If we anticipate an update will take more than a few minutes, we'll put up a notice with estimated time.

    Thank you!

Secondhand arbor slightly bent, query

NEW65

Registered User
Nov 17, 2010
1,854
146
63
United Kingdom
Country
Region
Just a query. I'm working on a hermle movement with the secondhand feature. The long arbor that projects outwards and through the dial, has been very slightly bent. It is slight though but you can see it wobble slightly when allowing the time train to run.
I am just wondering if this will cause a problem. Obviously it has been caused by an heavy handed individual trying to locate the seconds hand!!!
I just wonder if its fine to leave and use as is?
Screenshot_20221003-222232_Gallery.jpg
 

bruce linde

NAWCC Member
Donor
Nov 13, 2011
10,696
2,402
113
oakland, ca.
clockhappy.com
Country
Region
straight is straight. bent is bent. can't see how much bend there is, but if spacing is tight between second hand and dial that might be enough to stop the clock. if the bend happens before or while the arbor is passing through the pivot hole there is inevitably going to be some additional friction. since the goal is to remove (as much as possible) any unnecessary friction, my vote would be for straightening. that said, it might be possible to remove the slight bend without having to disassembly, just by nudging the arbor gently... but if at all in doubt just disassemble, straighten and then put it back together.
 

Willie X

Registered User
Feb 9, 2008
18,035
3,502
113
If you are a good 'tapper' you can straighten it in place using a small hardwood block. A 1" x 1" x 6" block is good for many purposes. Willie
 

bangster

Moderator
Staff member
NAWCC Member
Jan 1, 2005
20,028
600
113
utah
Country
Region
Iffen the seconds arbor is the escape wheel arbor (usually is) it would be a good idea
to straighten it and eliminate friction, since the ew is where the rubber meets the road.
 
  • Like
Reactions: wow

R. Croswell

Registered User
Apr 4, 2006
12,290
2,148
113
Trappe, Md.
www.greenfieldclockshop.com
Country
Region
If the extension is a smaller diameter than the part that passes through the plate, it is probably bent at the base of the smaller diameter part. If so, it is probably not contributing any extra friction. There is always the possibility that it will snap off when you try to straighten it. Of course there is the argument that it bent before and didn't snap, so it should bend back, but then it has already been bent once so be gently and accept the risk or leave it alone if it is only a slight bend and the seconds hand isn't hitting anything.

RC
 

Willie X

Registered User
Feb 9, 2008
18,035
3,502
113
You never know how many bends might be left in there. :)

Two points: don't bend it but once, by tapping only one tap at a time, in slightly increasing increments of energy. Don't apply energy at the tip of the shaft, go about 1/3 the way toward the root of the bend. This will help prevent the dreaded 'S' bend.

Willie X
 

Similar threads

D
Replies
1
Views
1K
dmorrow
D
D
Replies
7
Views
1K
dmorrow
D

Forum statistics

Threads
179,113
Messages
1,571,132
Members
54,070
Latest member
BB767
Encyclopedia Pages
909
Total wiki contributions
3,088
Last edit
Swiss Fake by Kent