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  1. #26
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    It is a strong(ish) alloy it's why I went with it for the tests. How I looked at the material I considered it an alternative to sandcasting, it had about the same tolerances but didn't require a pattern to be made. So I went for it and it worked. The thinning wasn't as grueling as you might think with a bench grinder it didn't take too long to grind down (probably because of the addition of bronze.) You have to look at these things as a labour of love, a lot like carving a lug.

    I agree about the bottom bracket, I didn't know that sort of product existed? Certainly not from Nova anyways. Could you send a link, it would be helpful. I haven't actually seen a shell with chainstays?

    Aligning the holes after finishing the lugs was actually pretty easy, I mitred the tubes and then used the lug as a guide for the holes, and voila two perfectly placed holes. The only difficulty I ran into there was the holes were a bit small (it was my fault on the design end, I assumed tolerances that weren't possible) so I used a rasp to make them a hair bigger then getting the clevis pin in was a snap.

    Well I'm almost finished the design work for the new set so I will send them off to be made, make some other stuff myself. The only issue with welding is I don't know how to do it lol... I could do fillets if I get a better torch. But at the moment I only have one that can barely do silver, and I'm assuming that for a BB I would want to do a fillet in brass?

  2. #27
    tuz
    tuz is offline
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    Ceeway has that shell (bottom of that page) and Bringheli lists it as well.

    Yes I guess you can use the lug to guide the hole. It's just that with a hand drill the bit can wander a bit and if there is play with the pin things could move a little.

    I can't weld either, I would braze-weld it. I'm guessing you are using an air-MAPP torch, that won't work. I could help you but only in a couple months.
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

  3. #28
    tuz
    tuz is offline
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    Here's another Toronto guy printing lugs and reinforcing them with carbon fibre.

    http://www.instructables.com/id/Cust...er-Bike-Frame/
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

  4. #29
    tuz
    tuz is offline
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    Here is another demountable frame, circa 1899.

    http://vintagebicycle.wordpress.com/...adster-c-1899/
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

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