Added captions and chapter bookmarks. Thanks for everyone's support. Make sure you check out the write up: forum.customframeforum.com/t/diy-cs-dimple-fixture-for-150/3366 and contribute to the disucssion.
Not sure I agree with this method for bike frame fabricaiton. Titanium is very sensitive to heat. To reach the CWSR condition, you need to hold the tube at 600F for 30min in an autoclave. That is the protocol laid out by the ASTM B338 standard.
@@Daniel_Yang_ARTEFACT I'm guessing that recipe is for modern titanium or only particular grades of titanium. I just know that my dad still works as a machinist for the past 50 years in a factory called Timet Metals in Toronto Ohio where they produce titanium for places like Boeing. Before they shut down the tubing mill, my dad was able to get 12 sticks of 2 1/2" x 10' long tubing and we never needed an autoclave to heat it up to bend it. Just used a standard torch and tubing bender. The bend will stretch on the outer side of the bend and it presses into a perfectly-shaped set of ripples on the inside of the bend. Was seriously nice since none of our vehicles even had to replace the exhaust other than the muffler (cherry bombs)
Interesting. Don’t people sometimes fill the tube with some medium (ice maybe??) so it doesn’t tend to crease too badly?-seems like I saw that somewhere. I also wonder about a silicone external mold to support the tube & limit the crease problem.
Nice work! I like that you mention the revisions that the next couple of revs will get.
Very much appreciate your sharing, and hearing about your approaches. Thank you.
Great video man! Very informative process, keep it up!
Added captions and chapter bookmarks. Thanks for everyone's support. Make sure you check out the write up: forum.customframeforum.com/t/diy-cs-dimple-fixture-for-150/3366 and contribute to the disucssion.
Have always heated up the titanium when bending it and I never had a problem with spring-back or cracking the titanium
Not sure I agree with this method for bike frame fabricaiton. Titanium is very sensitive to heat. To reach the CWSR condition, you need to hold the tube at 600F for 30min in an autoclave. That is the protocol laid out by the ASTM B338 standard.
@@Daniel_Yang_ARTEFACT
I'm guessing that recipe is for modern titanium or only particular grades of titanium. I just know that my dad still works as a machinist for the past 50 years in a factory called Timet Metals in Toronto Ohio where they produce titanium for places like Boeing. Before they shut down the tubing mill, my dad was able to get 12 sticks of 2 1/2" x 10' long tubing and we never needed an autoclave to heat it up to bend it. Just used a standard torch and tubing bender. The bend will stretch on the outer side of the bend and it presses into a perfectly-shaped set of ripples on the inside of the bend. Was seriously nice since none of our vehicles even had to replace the exhaust other than the muffler (cherry bombs)
Really cool Video :)
Interesting. Don’t people sometimes fill the tube with some medium (ice maybe??) so it doesn’t tend to crease too badly?-seems like I saw that somewhere. I also wonder about a silicone external mold to support the tube & limit the crease problem.
how to go from real shape (filed and sculpted block) to 3d model for machining?