Bummer! You probably already know this but I'll add it anyway. Your setup acts as great big heat sink and it may pull heat faster than you tought. When you redo your brazing bring the heat up slow so the fixture comes up along with it. When brazing the base metal will be cherry red or almost depending on what temp brazing rod you have. Brazing rod flows to the hottest spot so you can sweat it in much like copper water joints only at a higher temp. It is possible to also over heat the rod and have it oxidize leaving a weaker joint. If it were me I'd consider building up a larger filet at the hub on both the front and back and leaving it there for added strength. Another thought would be to contact a welder and see if they could TIG weld it.
Thanks John, my toolmaker buddy said the same. The braze flowed very well once I got the right temp, just didn't go right into the joint like I thought, tinning both parts will make sure it does! Did my usual thinning job but will leave a fillet next time...
dumb question.. what about preheating the jig in a oven ahead of time and then filling the blade terry? like john was talking about..
any idea how ernie l used to do his?
Sounds like a plan, the braze flows around 1100F, I'll put the whole thing in my kiln at 1000F for a couple hours then go at it.
I'll get it, I'm just that stubborn!
Did Ernie Lafleur braze on props?