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Just to make sure I can't afford it now, does anybody know where I could get a disc mount welded onto my ti frame? Apparently in US of A the mount can be had for $17 only (accoding to MTBR GT owners forum).
Enigma?
Enigma in Bristol?
And I very much doubt its available 'commercially' for $17...
[url= http://paragonmachineworks.com/storename/paragonmachineworks/dept/261291/ItemDetail-10464067.aspx ]$16.95[/url]
Brant, thanks. Probably, due to the unfinished nature if the mount, the £100 charged by Enigma isn't bad. Or is it?
Sorry read the $17 as the welding, not the mount.
Are you anywhere near Northamptonshire? i could do this for you
Steve Potts
Hairchested, you might want to have a look at this thread (particularly the photos) before making a decision you may regret.
http://www.singletrackworld.com/forum/topic/best-place-for-welding-on-disc-tabs-on-titanium-frame
That's what pushed me to send my old Merlin Taiga to Steve Potts. Either visit his website or I can mail you some pics of Steve's work. However, he ain't cheap once you consider the shipping cost. I think that if I hadn't been able to stump up the cash for Steve to do it I would have just stuck with canti / v mounts. Aesthetics aren't everything but if the original frame is nice looking it's a shame to butcher it. Also it's likely that the stays on an old frame were never designed to take the forces from a disc brake caliper, but Steve has a superbly designed (by John Castellano) mount which dissipates those stresses along the length of the stay.
rbrstr, can you show examples of your work? It'd be rather nice to use somebody from here.
pm'd you mate
yhm back
If someone can TIG weld then they can TIG weld titanium.
But how well shielded the weld puddle will be will depend on their experience and understanding of the requirements of an effective purge, to avoid contamination and degredation of the metal.
http://www.twi.co.uk/content/ksrjp002.html
"The titanium expert knows that it is one of the easiest materials to weld - but he is very familiar with very good back purges, and the use of a trailing shield."
http://www.weldingtipsandtricks.com/welding-titanium.html
"You only get one shot with titanium "
Once the titanium (weld) has absorbed any oxygen, nitrogen or other contamination from the atmosphere then the damage is done. A bad weld can be dug out and redone but, only if it is done in a controlled environment.
Welds can be dug out (dig and tig) for example if there is some tungsten inclusion (which would show up in a radiograph). But a poor weld can look much like a good weld once the surface (evidence) has been removed.
http://www.kobelco.co.jp/english/titan/files/details.pdf page 5 (although it is almost impossible to weld titanium without some discolouration. It is experience that the is best guide to what is acceptable discolouration)