In my days as an aeronautical quality engineer, I used a dye check method for finding cracks in metal. A red dye was painted on, then cleaned off. Then a white powdery developer was sprayed on. It pulled the red dye out of any cracks (even minute ones not visible to the eye) and made them very evident. This took no special lighting. I'm betting that the dye and developer is available fairly cheaply.
Rob On May 13, 2009, at 9:43 AM, Jeremy Till wrote: > > I'm no metallurgist, but I would think that a thorough cleaning and a > once/twice/thrice over with the hairy eyeball would be enough to > detect any cracks on a crank, given how little real estate there is to > cover. Focus especially on areas that might be possible stress > risers- crank/spider interface, taper, pedal eye, and any machining on > the arm. > > On May 13, 4:17 am, mitchelr <mitch...@onid.orst.edu> wrote: >> Hope this is not too far off topic. I have an old Sugino Impel >> crankset I want to bring back into use specifically because of its >> 94/58 five arm configuration (and the daunting cost of alternatives >> such as the TA Carmina). Ebay supplied an old Sugino set. But is it >> any good? My LBS folks looked it over and offered assurances but I'm >> still uncertain. Has anyone every used the Zyglo dye analysis >> process >> for parts such as a crank and if so was it worthwhile? I'm presuming >> automotive engine rebuilders will have the dyes and UV lighting but >> are there other sources? Many thanks for the good advice on this odd >> project. >> Rich Mitchell, Corvallis Oregon > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en -~----------~----~----~----~------~----~------~--~---
