Attempting an idler gear broken tooth repair.
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  1. #1
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    Default Attempting an idler gear broken tooth repair.

    Of the few parts that required replacing on my recent SB 13 rebuild (aside from a blown capacitor on the motor), only one part was actually broken, a missing tooth on the idler gear. All other replacements were from wear. A search for a replacement idler, here and on theBay, turned up nothing, so a DIY repair was necessary. A single tooth was salvaged from an old damaged Bull gear, carefully cut and sized to fit snugly into a matching slot in the idler. A small copper shim was inserted on one side to properly space the "implant" and prevent it from moving during the brazing process. A friend did the actual brazing. After cooling, the area was cleaned up using an angle grinder and file to restore the proper shape, a light buff with a wire wheel took off any sharp edges. During a brief test run, a very mild "thud" was heard, a quick tweak with a file corrected that. I'm very pleased with the results, wouldn't hesitate to do it again if necessary.
    Hope this encourages someone to give it a shot.

    Raydel
    Attached Thumbnails Attached Thumbnails 20200728-img_20200728_105329.jpg   20200728-img_20200728_105259.jpg   20200728-img_20200728_105157.jpg   20200730-img_20200730_182216.jpg   20200730-img_20200730_182858.jpg  


  2. #2
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    Quote Originally Posted by Raydel View Post
    Hope this encourages someone to give it a shot.
    Nice job but how come you didn't just get one out of the Boston Gear catalog ? Price too high ?

  3. #3
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    Because it is 14DP and Boston does not make them?

  4. Likes Rudd liked this post
  5. #4
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    Quote Originally Posted by kitno455 View Post
    Because it is 14DP and Boston does not make them?
    That answers that question, thanks Good thing I have a 14dp shaper cutter ...

    Coulda sworn someone did tho ... Browning ?

  6. #5
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    Similar - looks like yours is the better idea - and certainly for non restricted inner details versions - like not much "wall" thickness

    * Fix L&S Crossfeed Clutch Gear

    have fun

  7. #6
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    Wow that's beautiful workmanship! Thanks for sharing! I'll have to file that one away in the "bag of tricks"....

  8. #7
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    Quote Originally Posted by pavt View Post
    Wow that's beautiful workmanship! Thanks for sharing! I'll have to file that one away in the "bag of tricks"....
    I would file it in the same bag if only I had to skill to do it! This trick would be a way to make a damaged gear a destroyed gear in my hands. Good job it looks great

  9. #8
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    Great job on the repair. Most of the time, I have seen people just braze up the void, and then re-cut on a dividing head.

  10. #9
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    Nicely done, neat repair. Thanks for sharing.

    PS: Don't throw out that "donor" gear. Other PM members may need tooth transplants also.


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