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Acrylic pipebending 101 - Page 166

post #1651 of 4306
Unfortunately due to my location I can't get tubing for cheap.
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post #1652 of 4306
Did you set the mandrels up horizontally? Looking at the videos I see nothing but proper bends from Geno's work.
post #1653 of 4306
Quote:
Originally Posted by lowfat View Post

I've tried about 20 90-degree bends. Unhappy with every single one. Everyone has the grove on the side and almost everyone has a horrible inside bend.

This is disappointing........
post #1654 of 4306
Quote:
Originally Posted by lowfat View Post

I've tried about 20 90-degree bends. Unhappy with every single one. Everyone has the grove on the side and almost everyone has a horrible inside bend.
It really sounds like you aren't heating it up enough Lowfat, just my opinion though sir. Can you take a couple of pics for us??
post #1655 of 4306
Quote:
Originally Posted by Jimhans1 View Post

It really sounds like you aren't heating it up enough Lowfat, just my opinion though sir. Can you take a couple of pics for us??
You may be right. The tubing is becoming too cool before I can set the bend properly.
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post #1656 of 4306
Quote:
Originally Posted by lowfat View Post

Quote:
Originally Posted by Jimhans1 View Post

It really sounds like you aren't heating it up enough Lowfat, just my opinion though sir. Can you take a couple of pics for us??
You may be right. The tubing is becoming too cool before I can set the bend properly.


It took me a while to get a feel for using the mandrels . . . .

In my case, from watching the videos, where he keeps the heat on the tubing a little longer.

When I did that, it made the tubing so soft that the fabric impression from the gloves' texture transferred into the tubing where I was holding it against the mandrel.

I also got thumb "dents" or impressions on a few of the first tries.


For the tubing I was using, I found that keeping it about 3" above the heatgun while heating, and going to the mandrels as soon as the tube felt pretty "loose", and not waiting another 5 to 10 seconds or more, was the key to consistent bends with no deformations or uglies.

Also be sure to keep from "pulling" the tube "around" the mandrel, as opposed to bringing the tube to the mandrel, as you bend, as that causes the mandrel to sort of imprint itself.


Anyway, these were my observations from using them.

It was very frustrating at first with no acceptable results, but once I analyzed my procedure and tried some changes, I got it dialed in pretty well.

What you don't see and can't pick up on in the videos, and would be really hard for Geno to describe, is the "feel" or biofeedback he's responding to as he heats the tube and makes the bends.

Darlene
Edited by IT Diva - 1/6/14 at 11:48pm
post #1657 of 4306
Thread Starter 
Quote:
Originally Posted by IT Diva View Post

Quote:
Originally Posted by lowfat View Post

Quote:
Originally Posted by Jimhans1 View Post

It really sounds like you aren't heating it up enough Lowfat, just my opinion though sir. Can you take a couple of pics for us??
You may be right. The tubing is becoming too cool before I can set the bend properly.


It took me a while to get a feel for using the mandrels . . . .

In my case, from watching the videos, where he keeps the heat on the tubing a little longer.

When I did that, it made the tubing so soft that the fabric impression from the gloves' texture transferred into the tubing where I was holding it against the mandrel.

I also got thumb "dents" or impressions on a few of the first tries.


For the tubing I was using, I found that keeping it about 3" above the heatgun while heating, and going to the mandrels as soon as the tube felt pretty "loose", and not waiting another 5 to 10 seconds or more, was the key to consistent bends with no deformations or uglies.

Also be sure to keep from "pulling" the tube "around" the mandrel, as opposed to bringing the tube to the mandrel, as you bend, as that causes the mandrel to sort of imprint itself.


Anyway, these were my observations from using them.

It was very frustrating at first with no acceptable results, but once I analyzed my procedure and tried some changes, I got it dialed in pretty well.

What you don't see and can't pick up on in the videos, and would be really hard for Geno to describe, is the "feel" or biofeedback he's responding to as he heats the tube and makes the bends.

Darlene

Not how i found it,I found pulling the tube round gave far better,consistent bends with no bulging. I feel that the curve is a little tight on these mandrels.

What tube are you using? I found the E22 tube to be the best performing.

There is no need to actually touch the heated part of the tube,if you look at the pic below,you can see my hand spacing when bending.

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post #1658 of 4306
I figured out what was meant by pulling the tube. It seemed to work a whole lot better. I was just doing a practice 180 and acicidently got the mandrel stuck inside the bend. It was too close to another bend. Going to have to reheat the tubing to get it out. redface.gif
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post #1659 of 4306
Quote:
Originally Posted by lowfat View Post

I figured out what was meant by pulling the tube. It seemed to work a whole lot better. I was just doing a practice 180 and acicidently got the mandrel stuck inside the bend. It was too close to another bend. Going to have to reheat the tubing to get it out. redface.gif

doh.gif Ooops. Lol, that's funny.
post #1660 of 4306
Thread Starter 
Quote:
Originally Posted by lowfat View Post

I figured out what was meant by pulling the tube. It seemed to work a whole lot better. I was just doing a practice 180 and acicidently got the mandrel stuck inside the bend. It was too close to another bend. Going to have to reheat the tubing to get it out. redface.gif

Good work,it threw me for the first couple of bends but it was soon worked out.

How did you get the mandrel stuck?!?
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