Sunday, January 27, 2008
Upright Internally Geared Bike for Dad
My latest bike is based on the design of my commuter but built for use with a Shimano Nexus 8 internally geared hub. My dad used the Look stem until he found a comfortable position that didn't bother his neck. I've since made him a stem to match the way the Look stem was set up. The integrated rack on the back was unfinished at this point because I needed to see if the seat height would accommodate the bag fitting part way beneath it or if it would have to sit behind the seat entirely.
Here is a close up of the fastback seat stays. All the TIG welding I've done so far has been without the pulse function on. Now I am trying to figure out the pulser. It's taking a little getting used to. Update: I gave up on the pulser.
Here is the finished stem.
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So, the pulser. Can you tell me more about your tigging experience in general and the pulser specifically. I've bought a cheap Chinese TIG welder and am current on joint 10 of the 200-odd that you did and I'm keen to hear ideas to shorten the learning curve. Currently I'm using mild steel filler rod, pure argon, 4130 tubing and about 20-30 amps. The welds look ok but I'm not confident about trying to break them yet. I'm getting a tubing notcher and bending rig shortly, at which point I intend hitting up the local muffler shops for a pile of scaps to practice on - 4130 is a bit expensive for my liking (I've been making very tight wee practice objects with almost-overlapping welds).
The guys on www.WeldingWeb.com are helpful but no-one there seems to weld bicycle tubing, so it's a bit hit and miss. So any tips would be greatly appreciated.
thanks
Moz
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