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Thread: Bullneck frame machining

  1. #1
    Join Date
    Apr 2008
    Location
    Upper Yarra Valley, Victoria. Australia
    Posts
    829

    Default Bullneck frame machining

    As mentioned in another thread, I still have all the machining fixtures from the RFE frame business.
    A young guy recently asked me if I would machine all the tubing out of his wrecked Bull neck frame to get it in readiness for re-tubing.
    I think I am at the level of doing too much posting on the forum so I'll put it out there for consensus. Pictures-descriptions? Yes No?

    P9040001_2.jpg
    Steve Little
    Upper Yarra Valley. Victoria.
    Australia.
    AMCA member 1950

  2. #2
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    2,176

    Default

    No such thing as too much posting Steve, go for it!!
    Robbie Knight Amca #2736

  3. #3
    Join Date
    Mar 2009
    Posts
    539

    Default

    Absolutely!!

  4. #4
    Join Date
    Feb 2011
    Posts
    192

    Default

    this is good learning Steve ,yes from me

  5. #5
    Join Date
    Oct 2013
    Location
    Maryland
    Posts
    217

    Default

    Agree with all of the above. Keep it comin', Steve!

    Dale

  6. #6

    Default

    Please do!

  7. #7
    Join Date
    Apr 2008
    Location
    Upper Yarra Valley, Victoria. Australia
    Posts
    829

    Default

    Thanks to all. Must be a self imposed restriction ... or mind chatter.

    When a fixture is made, usually a Datum point will be machined into it.
    Machinists use the Datum to align the fixture to the measuring equipment of the machine, and all measurements are referenced from this point. Probably ho-hum info for the machinists in the club, but might be interesting and have some educational value for others.
    Usually a machinist will have a booklet or diagram for each fixture and this will have a list of tooling, machining procedures, and measurements.

    The datum on this fixture is the center drill mark in the top edge.

    P9050008.jpg

    P9040007.jpg

    P9040005_1.jpg

    P9040006.jpg

    I haven't used this fixture for a year and the booklet is not with the others.
    While I have a fossick around and look for it.
    Feel free to talk among yourselves and there is tea, coffee, and biscuits on the back table and I'll be back shortly.
    Steve Little
    Upper Yarra Valley. Victoria.
    Australia.
    AMCA member 1950

  8. #8
    Join Date
    Jan 2009
    Posts
    28

    Default

    Steve, this certainly isn't ho-hum stuff for me. all of this will be new to me and a blast to follow along.

  9. #9
    Join Date
    Apr 2008
    Location
    Upper Yarra Valley, Victoria. Australia
    Posts
    829

    Default

    Thanks nklhd.
    Good to see you on board.

    A tense ¾ of an hour went by before I located the machining book under a box.
    Once I found it, I moved the table to the appropriate side shifts and could get on with drilling and milling out the down tubes.
    Fitted to the neck into the fixture, and a 1” drill took out the stiffener brace.
    This has to be done, as I use a 6 flute 1-1/8” end mill to finish the clean up and they are not designed to take out a lot of steel.


    P9050001.jpg

    P9050002.jpg

    P9050004.jpg

    Cleaned out the stiffener and I got it nicely on center going by the witness mark in the bottom of the drill bore. I stopped at this point to take a picture. Completed the cut all the way to the bottom after that.

    P9050003.jpg

    The neck had some road trauma and the neck casting didn't get off scott free.

    P9050005.jpg
    Steve Little
    Upper Yarra Valley. Victoria.
    Australia.
    AMCA member 1950

  10. #10
    Join Date
    Apr 2008
    Location
    Upper Yarra Valley, Victoria. Australia
    Posts
    829

    Default

    Yep I'm happy with that. That sliver of steel down the bottom is probably a couple of thou” thick.

    P9050007.jpg

    7.30 pm and being hailed for dinner. Time for lights out.
    Steve Little
    Upper Yarra Valley. Victoria.
    Australia.
    AMCA member 1950

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