Re-bushing an FHF 15 cm movement

[Joseph111]

I have just stripped down an old FHF (old Hermle) clock movement and have noticed that there is a lot of wear on both the front and back plates from the pivots and I an fairly sure it needs new bushings fitting.

I have never had to do this before and was hoping for some general advice on how to do it, as well as what tools to potentially use. I am still working on dismantling the chiming mechanism which seemed to be jamming the main clock train every 15 minutes.

[oldhippy]

Could you take photos of the movement and the places that you think need re-bushing. 

[watchweasol]

Hi  Photos of the plates as asked by Old Hippy would be appreciated to assess the damaged bearings that require re bushing,  close ups of the errant bearings as well please.

[transporter]

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have a look at this thread, its perfect for you mate, as kt was for me.

[Joseph111]

Sorry about the delayed responce, I hadn't set up email notifications.

Here are two pictures of a couple of the worn bearings, I couldn't get a proper picture of the full plate as my phone wouldn't focus properly.

Thank you for your help. I should say that the clock did work (although the chimes are a problem) but I wanted to try and replace the bushings before they got any worse.

[watchweasol]

Hi   The top pic the bearing is badly worn  the bottom one looks circular but that's not to say there is wear, in bothe cases check the pivots running in the bearing. once everything is ready and waiting then do the rebush, Moose had a similar problem and with help made a grand job of the bushing, so its not an impossible job and can be done by hand.  It takes care and a steady hand  

[rodabod]

The top photo looks like someone may have tried to punch the hole circumference previously.

[watchweasol]

Looks suspiciously like a punch mark,  Not good practice  needs re-bush.

[Joseph111]

16 hours ago, watchweasol said:

Hi   The top pic the bearing is badly worn  the bottom one looks circular but that's not to say there is wear, in bothe cases check the pivots running in the bearing. once everything is ready and waiting then do the rebush, Moose had a similar problem and with help made a grand job of the bushing, so its not an impossible job and can be done by hand.  It takes care and a steady hand  

I will have access to a pillar drill when I do the repair so that may help.

As for the punch marks, I have no idea where it has come from but before I first had a look at it a year ago, it hadn't worked in around 40 years and before that I don't know how often it was serviced.

Thank you for all the suggestions and help. I will get on with it when we are all allowed out again.

[Jon]

Make sure you drill where the centre of the whole used to be, rather than where the drill bit wants to take you, or if it is a small hole, try reaming it out with a jewelling tool, or a clock reaming tool if bigger. There will be a greater degree of control, because everything is slower

[watchweasol]

Like John says  use a broach to cut the hole, I have used a pillar drill Necked down with a pin chuck but use a s short a bit as you can it stops it wandering. If you file out the hole fron the unworn side to even it up it helps to keep the drill/broach in the center . have a look at the link fir guidence                 https://www.davewestclocks.co.uk/Bushing.clock.plates.htm.