Seat Tube Braze-Ons - DIY Bike Frame Ep 5
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- čas přidán 9. 03. 2024
- Hobby framebuilder. Video series of me building a new bike frame in my garage. This will be the 8th frame I've built, but my first CZcams video series. The new frame will be built up as a trail bike with a 150mm fork.
DIY Bike Frame
#HobbyFrameFab
Check out Paul Brodie's channel @paulbrodie for more framebuilding videos:
/ @paulbrodie
I'm a big fan of this playlist from Paul where he builds a Brodie Romax:
• Romax Build
Check out this playlist from BikeFarmer @bkefrmr where he builds a lugged steel adventure/touring frame:
• Bicycle Framebuilding - Jak na to + styl
Silver is hard! I've found that a smaller neutral flame, staying 3 or 4 inches off the tube and moving constantly until the flux goes transparent, then only adding heat at that same distance when I want silver moving to work for me. So easy for parts that small to get red hot!
I wish I did it enough to try different things. I think once I used a really small flame and got in close and it worked well too.
Perfectly functional 💪😎💪
“Sufficiently Functional” should be my tagline.
Yesterday I practiced brazing steel and stainless steel for the first time. I used castoline 18xfc for steel, everything works fine. But with silver and stainless steel the result is not stable, five attemps and one is successful, the rest were either not heated enough with propane-oxygen or overheated the flux and silver doesn’t want to stick and I can't understand what the reason is. I use 45% silver solder and a special flux for brazing stainless steel.
There is not mush info about framebuilding In russian segment of youtube so i found a old USSR silver-brazing manual from 1964. Hope it will help me😅
As long as you aren’t brazing stainless, you can use bronze for the entire frame. I used all steel braze-ons for the first couple frames so that I could do all the brazing with bronze.
Good luck with your practicing!
Another great and informative video. But I would suggest a little less flux. Never brazed a bike frame, but did quite a bit of it for work. Also, it's usually suggested that you only crack open the acetylene tank a quarter turn or less. If the gas is allowed to expand too quickly, it can self ignite and explode. Only an issue if there is another fault, such as a sticking regulator, or one that wasn't released from the previous time....
The 'old standard' was a third of a turn, or less. He opened it about a third, but the more important spec, is that pressure is 15psi or below. But yes, your safety concern is valid.
Thanks! And thanks for the reminder about the acetylene tank. I probably did about 1/3 turn, but you are right, less would be better. My original Sear's brand acetylene regulator blew a seal while I was making frame number 2. I was able to close it quickly, but it scared the crap out of me. Lucky for me nothing ignited. Bought all new equipment after that. I still have lingering thoughts of what might have happened.
Did you have an in-line fluxer? I think I could use less flux if I had a gas flux setup. Most frame builders I've seen that use less paste flux also have gas fluxers. I'd like to get one, but it is pretty low on the list.
@@ThriftyFramebuilder Yikes. Glad nothing happened when the seal blew. But it is exactly that kind of 'lesson' that sticks with us for life. I'll still read the basics manuals every once in a while to refresh my memory/'habits.' Great video series.
Never use to little flux. Flux is your friend and oxidation is your greatest enemy in soldering, brazing, welding. That's the reason why some people are good at those tasks and the majority sucks at it because they use to little or no flux. 😂
@@ThriftyFramebuilderYou are right on opening the acetylene - I was looking at the oxygen.
I don't have an in line fluxer, but found that the flux is very effective. But I was looking at it from a production standpoint. If you are making 100 frames, you might find less flux to be better. Too much is definitely better than too little, and you weren't globbing the heck out of it like some do.
Just wanted to jump in with my 2 cents worth - you are already doing a much better job than I would if it was me making the frame! Looking forward to the next video.