Bearings in clocks

For the makers of various third party clock designs..
User avatar
Mooselake
Old Timer
Posts: 504
Joined: Sun Dec 26, 2010 12:21 pm
Location: Mooselake Manor

Re: Bearings in clocks

Post by Mooselake »

The start of a new service, the Gerotic Delivery Net?  I didn't think of it this time, but if they drag me off on another expedition.  The youngest girl (the one I owe an international trip to) is starting to hint about South America.

I can't be the only one who's wife wants to turn into a global traveler; perhaps we need a pending international request and delivery list.  Likely slower than Kickstarter but less likely to fail :)

Kirk

John T
Old Timer
Posts: 446
Joined: Tue Oct 05, 2010 9:53 am

Re: Bearings in clocks

Post by John T »

I’ve just completed David Atkinson’s Sextus design and it is the first clock that I installed steel bearings. Although David has bearings in several locations I only installed them on the pendula. Since the escapement is a grasshopper type it is highly sensitive to the drive weight to regulate the time, I found that sufficient weight to maintain the running of the clock meant that the clock was being overdriven. By installing the bearings in the pendula I was able to use a much more acceptable drive weight, and thus more overall time accuracy.
Here is a picture of the finished clock.
6F57D4E9-DB1E-4D6F-BC4C-0233673F1B1D.jpeg
1% inspiration 99% try, try again
User avatar
ArtF
Global Moderator
Global Moderator
Posts: 4363
Joined: Sun Sep 05, 2010 6:14 am
Contact:

Re: Bearings in clocks

Post by ArtF »

Hi John:

Awesome work. I agree totally with you, a bearing can do wonders for almost any work, and I
really advise using them when one can. Merry XMas and thx for showing us your work.

Art
Hessel Oosten
Old Timer
Posts: 41
Joined: Sat Apr 07, 2012 10:22 am

Re: Bearings in clocks

Post by Hessel Oosten »

Really wonderful clock John !

Once I did read that bearings give a 70 % reduction in resistance, in comparison to fine polished (e.g. steel in bronze in clocks) pivots.

Hessel
User avatar
kit
Old Timer
Posts: 85
Joined: Sat Apr 02, 2016 3:51 am
Location: Tasmania

Re: Bearings in clocks

Post by kit »

That's a nice example of the Sextus. It's a very hypnotic design to watch!

I was surprised at how much difference there is between ball and plain bearings. Soaking them in solvent to remove any manufacturer-installed grease apparently helps as well. At the speeds we run these bearings, grease and oil simply add drag.
Post Reply