Take a look at the finished bicycle here..

Saturday 28 May 2011

Metal work, works!

   I have in my grubby hands two pieces of metal work greatness. Lew ( the engineering man) made the parts up for me from my card board templates. I had stock head tube section and a standard blank bottom bracket shell from Ceeway, which I bought back at the start of the wooden bike build in order to measure up to. As the wooden frame came together and I understood more clearly where and how the metal parts would need to fit, I was able to discuss the detail with Lew. He then made a jig to hold the plate at 90 deg' to the tube as he braised them together.

Head tube and fin fixing.

    Hopefully this shows how I intend to sandwich the fin between the yet to be laminated wooden layers that make up the wooden bike frame. The Head tube has a wedge shape to it in an effort to increase its holding strength in the frame, it may well be bolted through as a precaution too.

Bottom bracket with fitting fin.

      With the bottom bracket, we decided to take the fin all the way around the shell. Originally I had intended to have the bottom section of the bracket shell exposed with the fin similar to the head tube. But then I decided to surround the shell with wood, and after discussion with a couple of engineering types it seemed a good idea to get as much strength into the bottom bracket area as possible. It seems obvious, but the stresses going through this section are huge, especially if I go fixed gear or single speed with the bike. Gearing it will drasticly reduce the loading, but I don't really want that.

   Next I need to paint the bits that will be exposed to the outside, while leaving the bits bare that will have direct epoxy resin contact.

   I have also just ordered  from Ceeway, two blank stainless track style drop outs and some 22mm tube to make the rear stay/drop our connections. I had hoped to use the left over head tube but it was just too big at 31mm diameter. Ceeway is just a treasure trove of frame building bits.

   On the wood working front, I hope to have the stays shaped soon and if the weather is warm enough I will have a go at the first stage of bonding the four frame layers into two halfs.

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