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Thread: Square broach

  1. #1
    Supporting Member EclecticNeophyte's Avatar
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    EclecticNeophyte's Tools

    Square broach

    ...er, well sort of.

    After spending countless hours building a 17ft all wood fishing boat, finding a suitable motor (and rebuilding it), and then FINALLY getting everything into the water for a maiden test run...everything was...so far so good! Or so I thought...

    ...while returning to the dock, I went to shift the old Merc outboard into reverse, only to have the shift lever break off and fall in the water. Too deep to retrieve, so I managed to shift it using my multi-tool and get docked, onto the trailer and then home.

    Once there, I removed what was left of the shift lever.
    Square broach-20180626_083219_tiny.jpg
    Square broach-20180626_083228_tiny.jpg

    It was the factory original, and made of all things...plaaaaas---tic??? I scoured the web as well as local sources, but couldn't find a single replacement. So I made a pattern, rammed up a green sand mold, and cast a new one in aluminum!

    Square broach-20180619_142235_tiny.jpg

    Only one problem...that cursed square hole to fit the shift-shaft!

    To date, I still know very little about making a broach, and I knew even less at that time. But I decided to give it a go, and see if I could make something that would work. I found some square key stock that was the same dimension as the shift-shaft, as well as the old handle remnant, and turned a round section onto one end to act as a guide. Here's the finished item (photo'd after it was used):

    Square broach-20180625_170832_tiny.jpg

    It didn't work the best, and had to be resharpened often. But it did broach the square hole, and that's all I needed. The new handle was fitted to the old Merc motor, and works great!

    Square broach-20180626_082207_small.jpg

    -EN

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  2. The Following 8 Users Say Thank You to EclecticNeophyte For This Useful Post:

    baja (Feb 10, 2021), Big-Pete (Feb 10, 2021), bigtrev8xl (Feb 10, 2021), Jon (Feb 10, 2021), NortonDommi (Feb 9, 2021), rlm98253 (Feb 14, 2021), Scotsman Hosie (Feb 13, 2021), Toolmaker51 (Feb 10, 2021)

  3. #2
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    Thanks EclecticNeophyte! We've added your Square Broach to our Machining category,
    as well as to your builder page: EclecticNeophyte's Homemade Tools. Your receipt:




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  4. #3
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    wizard69's Tools
    Nice repair / upgrade!

    This just highlights the concept “ if there is a will there is a way “

  5. The Following 2 Users Say Thank You to wizard69 For This Useful Post:

    EclecticNeophyte (Feb 11, 2021), Scotsman Hosie (Feb 13, 2021)

  6. #4
    Supporting Member rlm98253's Avatar
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    Well done, sir.



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  7. The Following User Says Thank You to rlm98253 For This Useful Post:

    EclecticNeophyte (Feb 15, 2021)

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