Mitering a seatpost for a 38mm bottom bracket: https://youtu.be/rJze8PZNkiI
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Second mitering cut for a seat stay with an extreme angle at the seatpost: https://youtu.be/gYDjcnfHJ9IComment
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Last one for now: using a horizontal mill to cut a notch for the dropout tab in a chainstay: https://youtu.be/OwjCCvvlBosComment
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This is really cool. Videos weren't allowed back in the day before cell phones.
I have only watched one video so far but I don't see this guy dong any hand feeding the wire. While you watch YouTubes, get a piece of wire in your glove hand and practice feeding the wire through your fingers and then try keeping the wire tip at one point while feeding. Kind of like holding a baseball or football all the time while you socialize or sleep.
In the Ti Tig class you will learn to fusion weld Ti first then lay beads over it. I eventually fusion welded steel frames before brazing. Had some issues tig tacking just a few spots before brazing so I started fusion welding first. Lots of extra work for sure. I prefer brazing over tig. Tig bikes break just behind welds and brazed bikes bend before snapping. I walked 17 miles in SB back country carrying a sponsors bike that the HT basically came off after I stuffed it in a creek bank. I saw a Klien Attitude TT snap in half and one end of the tube ended up in the guys spleen at Norba Nationals in SB.
I anneal all my TIG only frames now.Last edited by geckocycles; 08-08-2018, 07:35 AM.Comment
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They marked my long winded comment as SPAM and didn't post my reply for whatever reason. So here is a short version.
I don't see how you can build a frame with out a Oxy setup.
That is way too much money for that instruction. I hope he isn't doing the Ti class.
It is one thing to practice with those bad habits but to teach them is another story.
I wanted to make it clear that I did not take the UBI class, but when I was working for Zinn, he took the class and came back to the shop and taught me. I had some amazing mentors back in the day. All of which everyone has heard of. My specialty is brazing. I have only TIG welded a little more than a hundred frames. I have not had a single frame failure in the more than 400 bikes built, that has been brought to my attention anyway. I am not proud of my TIG welds looks but will stand behind the quality. -
The comments flagged as spam get approved within a few hours. Sorry about that.
I will get an O/A setup just as soon as I can find a place for the acetylene other than my home or storage unit. I can have acetylene here on the weekends; maybe I could just rent a tank for the weekend when I need it, or store the tank at a friend's house. -
There were definitely some issues with that instructor. Rich Bernoulli is the Director of Framebuilding for UBI, and he does teach the Ti classes. He teaches almost all of the framebuilding classes in Portland and Ashland. The 2 week Ti class is $3,995.
I am inclined to go into detail as to why I would take a framebuilding class anywhere but UBI, but I will stop myself from flaming on this forum. I did some flaming about him on the Welding Tips and Tricks Forum, but nobody should flame anywhere. I just want to encourage, inspire and help--like Jody does! Jody is such a class act.Last edited by commuter ebikes; 08-09-2018, 07:07 PM.
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I use abrasive wheels for this in a dedicated piece of shit china bench top knee mill I picked up for cheep. Much faster and I have never screwed a tube up when a tooth catches thin heat treated material. It is good to have sacrificial machines for the dirty work you don't want to use good machines for.Originally posted by commuter ebikes View PostComment
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Not fond of his welding sequence or lack of wire brushing between starts. His tacks are more like welds. I weld outside of the jig in a park stand though. To each his own. There are many ways to skin a cat, what ever works for you.Originally posted by commuter ebikes View PostComment
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You should not continue welding after sticking the tungsten as he did on start. Even though it was very minor a small piece surely broke off and is in the weld now. Not good especially on Ti. You can get away with lots on steel though. It just isn't good practice.Originally posted by commuter ebikes View PostComment
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Again...hardly a tack. Tacking should be very quick with as little heat put into the jig as possible. Stresses are built up into the tube and put undue stress on the jig. When you jig weld you will get more implosion of the tube where the miter meets plus the tube is not allowed to expand and contract putting lots of strain on the tube, especially in the heat effected zone.Originally posted by commuter ebikes View PostComment
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My CS and SS fixture holds both tubes at the same time.Originally posted by commuter ebikes View Post
I don't like rotating the head on my V Mill unless it was dedicated to mitering. Rotary tables holding fixtures is way more accurate and then frees up the mill for other things and keeping the head trammed for quick machine work other than mitering.
He is getting away with lots here being the tubing he is cutting isn't that hard. He has way to much over hang for heat treated thin wall tubing on many of his setups. There are tubesets that require the miters to be ground. Again the sacrificial machine away from all your good machines is in order for that hard stuff.Comment
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