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Acrylic pipebending 101 - Page 238

post #2371 of 4306
anyone used the 3/8 ID primochill tube and had trouble with the hollow silicone they send with it? i cant seem to make a bend that doesnt kink or flatten on the radius because the tube seems slightly too small and collapses too easily while bending. any solid alternatives that work better?
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post #2372 of 4306
If the bend is kinking of flattening the tubing likely isn't hot enough. Not the bending cords fault.
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post #2373 of 4306
its gets hot enough, but it seems to cool down before i can get the chance to bend it around something, and another problem it seems to have is when im heating it (and no im not too close as ive tried different distances) the area im heating seems like it swells up when it gets to the point of being able to bend. bought the monsoon mandrel kit for bending and when the tube is cold it fits in them loosely but when its hot its too swollen to fit into the radius of the mandrel.
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post #2374 of 4306
Did you watch all the bending videos that Monsoon released? The tubing shouldn't swell up at all.




Finally doing the acrylic for my ESXi server. Did the second super long run. Ended up cracking my first run in the process. tongue.gif



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post #2375 of 4306
i watched primochills video and monsoons. gonna give it another go now.

edit: this is what it looks like after bending, im going to order some solid buna n cord from mcmaster, im convinced this hollow hose is the issue, it seems way too soft to prevent flattening.


Edited by TurboMach1 - 3/9/14 at 8:16am
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post #2376 of 4306
Quote:
Originally Posted by TurboMach1 View Post

i watched primochills video and monsoons. gonna give it another go now.

edit: this is what it looks like after bending, im going to order some solid buna n cord from mcmaster, im convinced this hollow hose is the issue, it seems way too soft to prevent flattening.
Image (Click to show)

I got the 9mm cord from McMaster Carr because of the issues I was having just trying to insert the Primochill cord. It didn't want to fit. But the pieces I've had flatten out I'm pretty sure was because I wasn't heating it long/slow enough or anywhere near a wide enough area on each side of the bend. I also was heating it up a little too quickly at first that might have contributed.

Once I started heating it much more slowly over an area at least 10-12cm (~4") to the point it's all totally flimsy/rubbery like a spaghetti noodle (usually I heat it to where I think it's enough and then I'll keep heating it for 30 seconds or so longer than that just to be sure) it got a lot easier to produce a perfect bend. It's also important to lightly 'pull' the tube around the former like you are trying to stretch the outside radius around the bend as opposed to just trying to bend the tube.
post #2377 of 4306
Perhaps you are not heating it enough? I only had one kink while free handing. Now I made a temporary jig using some wood and the end caps of the cardboard tube he tubing came in. Seems to give a decent bend and it was free smile.gif just wondering if that is to small of a bend?
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post #2378 of 4306
When I was working on my tubing I used the hollow cord in the tubing and didn't have that problem. Maybe your not heating a big enough area of the pipe to do the bend.
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post #2379 of 4306
you guys are doing great job with bending those acrylics thumb.gif
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post #2380 of 4306
Hollow tube definitely isn't the issue. The hollow tube is IMHO much better than the solid one. It is much more forgiving on the bends. Try using the heatgun at a lower setting and heat for longer. Also heat a wider patch of tubing.
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