Repair Broken leaves

Discussion in 'Wood Movement Clocks' started by Andy Dervan, Mar 22, 2017.

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  1. Andy Dervan

    Andy Dervan Registered User
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    Oct 23, 2002
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    Hello,

    One of cats tipped over a wood works movement mounted on a stand and it fell over and broke most of the pinion leaves on escape wheel arbor and I am wondering how to repair/replace the damaged pinion leaves?



    Andy Dervan
     

    Attached Files:

  2. BLKBEARD

    BLKBEARD Registered User
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    Nov 15, 2016
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    If you have the pieces you might be able to glue them back on. maybe use rubber bands made for dental braces as band clamps. Fresh breaks usually mate up pretty well. (I'm speaking from experience on antique furniture repair, not experience on wooden pinion repair, so take this with a grain of salt)
     
  3. ballistarius

    ballistarius Registered User

    Oct 26, 2009
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    Breaks are 'fresh', but not 'clean', because there are dents besides the breaks. That imply some degree of deformation which would hinder a perfect match in case the detached leaves were recovered, I fear...:(

    Aitor
     
  4. Jim Burghart

    Jim Burghart Registered User
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    Jan 27, 2004
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    I have had very good results casting new pinion leaves using Knead a Mold or modeling clay to make a mold of good teeth, and casting new ones with epoxy.


    I can't tell from the picture, but are there good leaves remaining? If so the casting is straight forward, and I have yet to have one fail.

    I am attaching some photos from a recent repair.

    If you would like I could add some detailed information about how I complete the repair.

    Jim
     

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  5. Andy Dervan

    Andy Dervan Registered User
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    Oct 23, 2002
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    Hello Jim,

    I believe the pinion has either 8 or 9 leaves and 3 leaves are unbroken. In theory new leaves could be cast.

    I have not really run this movement, but I would really like to have it whole again if possible.

    Are you a Cog Counter member?

    Andy Dervan
     
  6. Jim Burghart

    Jim Burghart Registered User
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    Not yet :) I have been meaning to join for a long time, but I keep forgetting. I am retiring in 6 months and stepping up my clock obsession.
     
  7. Andy Dervan

    Andy Dervan Registered User
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    Oct 23, 2002
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    Hi Jim,

    It only costs $ 5 year; we have a picnic meeting before Syracuse Regional and it is great opportunity to meet 100 meeting and see a lot of unusual clocks and movements.

    Andy
     
  8. Jim Burghart

    Jim Burghart Registered User
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    I sent my dues in today :) I went for the whole $10 value pack too.

    Looking forward to it!
     
  9. R. Croswell

    R. Croswell Registered User
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    Just to put another option on the table, you could contact Don Bruno http://www.torringtonclockco.com/ and have a new part made. It can sometimes be tricky to remount the escape wheel to run true so if the molded repair works that will be great. Be sure to let us see the results.

    RC
     
  10. Troy Livingston

    Troy Livingston Registered User

    Aug 28, 2006
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    Andy,

    If you have the pieces then I would suggest gluing them back in place. The breaks are generally quite clean and I have had excellent results with a good 2 hour epoxy although I am becoming more fond of hide glue as this is reversible if things go wrong and cleanup of the excess glue is a snap. Old Brown Glue requires no glue pot and keeps for ages in the refrigerator. Glue one or two at a time, you want to keep the leaf being glued as close to vertical as possible so it doesn't creep before the adhesive sets. If you do this I find clamping is not required. Rubber bands can be frustrating to use as any slight difference in tension will cause the tooth to shift as the glue sets. Test fit your pieces and do a dry run before applying the glue. This also works quite well on teeth, I have a small vise on a rotating base that I use to hold the wheel. Repairs done in this manner are strong and nearly invisible.

    Troy
     
  11. Andy Dervan

    Andy Dervan Registered User
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    Hi Troy,

    I believe pieces are gone, movement got tipped over and I did not see for a day or two and if there were any tiny pieces around the cats would have delighted themselves further by distributing them.

    Andy
     
  12. FDelGreco

    FDelGreco Registered User
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    Aug 28, 2000
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    Andy:

    You cast cast new leaves, making the mold from the unbroken leaves. Phil Gregory taught a field suitcase workshop where we did that. Try contacting Phil and he could tell you whether it could be done on your specific pinion.

    Frank
     
  13. Troy Livingston

    Troy Livingston Registered User

    Aug 28, 2006
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    Andy,

    That's a shame but perhaps not a shock after a closer look at your photo. Almost looks like there may have been some chewing involved (?) At least the breaks have damage that seems atypical. In that case it is time for a proper repair, fit a new pinion or pinion/arbor complete.

    Troy
     
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