Screwdriver
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Well whatever it is, it looks amazing. I want to have a go! It's on my list of things to do right up there with vacuum explosion welding.
Its METCO or SULZER METCO who are the usual manufcatuer but these days they do a lot of wire. The machine arcs two wires togeether and then a blast of gas sprays the molten metal.......same thing really
Chris, wasn't that because of the cast iron AMC used ? I know they changed to SG cast iron in an effort to stop breakages.
I had an ajs 250. the crank pins snapped no end -ended up getting an alpha big end fitted and even that bust ajs = all junk and sh...it
I remember reading an article many years ago about the crankshaft snapping problem. It suggested that it was due to misalignment of the centre web, through which oil was fed to the big ends, causing the crank to flex. I never had the chance to investigate as I never got round to rebuilding the twins I had, but it seems likely. The machinery at AMC and Norton was quite old coming into the 50s.
The crank centre web was a reply to another comment. The Superblend was introduced to prevent the heavy number of main bearing failures that were experienced due to flexing of the crankshaft. Since parallel roller bearings are not designed to allow for any axial misalignment, the end result was that there was a high point loading on the roller ends which of course caused early failure.
A job for a professional machinist in my opinion unless you can find a replacement, they will be out there sitting and going dusty on some shelf but finding it is the nightmare.
You should be able to locate someone near you but if not:
This guy is a magician with restoring engine parts, he is also a lover of classic bikes and I would trust him 100%, obviously you would have to post the part to him but worth a phone call I would think, nothing to do with me other than I have had work done and admired his skills for years.
http://www.192.com/atoz/business/wh.../05c5793fe358f3c0ab171457bf3e62014c8cf50e/ml/
The Nickel Rods for cast irons have a graphite coating which allows the rod to run on low currents thus keeping the heat down. Low heat is good on Cast Irons. This graphite coating wouldnt get good penetration on most other alloys. The other Nickel rods such as 625 or 82 have coatings similar to Low hys mainly to maintain low impurities and achieve a sound weld.