I decided to build a proper jig for this frame. Last time I built one from mdf and it caught fire, more than once.
I am a bit confused about what work should and shouldn't be done in the jig. Obviously all the parts and tubes can be prepared and fitted together in the jig but I read that it should be tacked and removed from the jig for brazing.
If this is the case, how do you tack lugs? It makes sense for tig but do you do the same for lugs? Is the flux/surface prep inside the lug compromised by tacking then cooling then brazing fully. Do you tack the whole front triangle before completing any joints?
I know there are recommended sequences for brazing the joints but would this way work:
1 Braze the hockey stick
2 Braze all the tubes into the bbkt (including chainstays
You now have the 'spine' of the frame complete
3 Check alignment and cold set if necessary. (I assume it is not good to re-heat a lug and re-align a tube, for example the DT in the BBKT if the HT and ST are not parallel)
4 Braze in TT
5 Check alignment again.
6 Locate seat stays, check with a wheel in frame then braze.
Thanks
Mike