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  1. #101
    Mtn Biker Machinist
    Reputation: 1 cog frog's Avatar
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    Keep it coming

    Definitely want to see more of that project!

    All on manual machines, you are the man!

    What's the story?

    frog

  2. #102
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    A Vintage Parts Fab-img_5057.jpg
    Last edited by DoubleCentury; 05-11-2011 at 07:49 AM.

  3. #103
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    FASPs?

  4. #104
    DIY all the way
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    Hey DC,

    Nice to see someone else who also managed to shake the armchair

    Have you considered taking up carbon fiber and Kevlar for making parts?

    I tend to find that fiber is a better and easier solution these days.

    Having said that, I will admit to still use aluminium and titanium on regular basis.


    Magura

  5. #105
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    Quote Originally Posted by DoubleCentury
    Click image for larger version. 

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    Are those all reprove or are we supposed to see if we can identify the original one(s)? Either way, beautiful work.
    Need: McMahon brake for roller cam mounts, Mountain Goat fork.

  6. #106
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    You'll be able to tell them apart from the originals because they will only be attached to bikes that I own.

    A Vintage Parts Fab-img_5049.jpg

    A Vintage Parts Fab-img_5050.jpg

  7. #107
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    Quote Originally Posted by DoubleCentury
    You'll be able to tell them apart from the originals because they will only be attached to bikes that I own.

    Click image for larger version. 

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    Click image for larger version. 

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    Nice work there.

    Would you mind taking a photo of the post in bits and pieces?


    Magura

  8. #108
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    Quote Originally Posted by DoubleCentury
    You'll be able to tell them apart from the originals because they will only be attached to bikes that I own.
    Nice. Is the seat angle fixed? How did you cut on the arch on the top piece?
    Trade: My 17" c2c Fat Chance Monster Fat in Fair condition for same in 18- 19"

  9. #109
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    Quote Originally Posted by DoubleCentury
    You'll be able to tell them apart from the originals because they will only be attached to bikes that I own.
    Real Nice Mr T! Those are looking good.


    I know how to tell them from the originals

    but only because I have the originals

  10. #110
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    On DoubleCentury's request, some pics of some of my DIY stuff:

    I have no pics at hand of the carbon road fork, but will get some ASAP.





    Carbon brake pads (the material is not the same carbon as you see frames made of, but rather some aerospace stuff called Carbenix)



    A thermal image of the carbon brake pads in action.



    A floating rotor.



    Pulley wheels made of carbon multi-wall nanotubes


    Kevlar based chain rings.


    Magura

  11. #111
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    Quote Originally Posted by DoubleCentury
    You'll be able to tell them apart from the originals because they will only be attached to bikes that I own.[/ATTACH]
    I wish I owned a bike worthy of such nice work. Really neat stuff, thanks for posting!

  12. #112
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    Quote Originally Posted by DoubleCentury
    You'll be able to tell them apart from the originals because they will only be attached to bikes that I own.
    Why does CC use two separate pieces for the post? Or maybe a better question is why did you use one solid piece?

  13. #113
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    These are indeed fixed angle seatposts, so a special fixture is used to mill the appropriate angle, which is determined either by trial and error or mocking up with a conventional post.

    The large radius and chamfer to the top clamp piece was made by turning a hockey puck size piece of aluminum, then dividing it in half and finishing up on a mill. One puck makes to clamp pieces.

    Charlie's earliest posts were made as one piece, but currently available tapered posts are two pieces and are centerless ground. He prefers not to have to machine the thin tubing, especially for the larger posts. Of course those also have an insert glued in the upper portion. For the tapered posts, I started with 1-1/4" OD tubing with 1/4" wall, so the inside was opened up to 7/8" and the outside was turned down to about 1-1/16". There is a lot of machine time involved in making those smaller posts, like 12 to 15 hours each for a complete post. Yikes.

  14. #114
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    A Vintage Parts Fab-img_5066.jpg

  15. #115
    DIY all the way
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    Thanks. A nice way of making a seat post indeed.


    Magura

  16. #116
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    And I felt good helping my son with his pinewood derby car.

    So Impressive....

  17. #117
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    A pic of my DIY carbon fork.

    Keep in mind it was made a long time ago. To be exact 18 years ago.


    Magura

  18. #118
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    DC, excellence personified!

    Camerawork coming along nicely too ;-)

  19. #119
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    Quote Originally Posted by DoubleCentury
    The large radius and chamfer to the top clamp piece was made by turning a hockey puck size piece of aluminum, then dividing it in half and finishing up on a mill. One puck makes to clamp pieces.
    Thanks, now I can see how you made these. I couldn't figure out how you had made them so consistent.
    Trade: My 17" c2c Fat Chance Monster Fat in Fair condition for same in 18- 19"

  20. #120
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    The Making of a Cunningham-like Brake

    A few steps in the manual production process of this brake. There is a pattern involved, but it is still a very tedious process so I only make a brake if I really need it.

    As I later learned, this design was done in the 1930's and was known as the Schultz brake. I call this one the linear-cross-bar-brake or LCBB.

    A Vintage Parts Fab-img_3832.jpg

    A Vintage Parts Fab-img_3834.jpg

    A Vintage Parts Fab-img_3835.jpg

    A Vintage Parts Fab-img_3838.jpg

    A Vintage Parts Fab-img_5723.jpg

  21. #121
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    The Schultz brake can be seen on this bike, and what a wild bike it is!

    http://www.reneherse.com/Schultz.html

  22. #122
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    Lost Part

    How many of these have been lost over the years?

    A Vintage Parts Fab-img_5736.jpg

  23. #123
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    Quote Originally Posted by DoubleCentury View Post
    How many of these have been snapped into a bajillion pieces over the years?
    Fixed if for you.
    Attached Thumbnails Attached Thumbnails A Vintage Parts Fab-img_5736.jpg  


  24. #124
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    Ha ha, that's pretty good.

    For something that had a rep for breaking, it's not light. Oh, and it's not going on any of my bikes either!

  25. #125
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    Quote Originally Posted by utahdog2003 View Post
    Fixed if for you.
    Yeah that's right, I seem to recall these going south the hard way too.

    Funny though, cause when I look at it, it seems to be made well, and the engineering behind seems sound enough as well.

    It could be interesting to make FEA on it, just to see what exactly went wrong.



    Magura

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