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Offline wilTopic starter
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« on: February 09, 2011, 05:31:49 am »
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Anyone have any actual experience bending aluminum tubing for diy metal detectors?
I've tried filling the tubing with sand, but it will still kink up. I realize that it can be done on a  machine, but what I'm looking for here is an effective homebrew method. 

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Offline GoldDigger1950
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« Reply #1 on: February 09, 2011, 11:30:44 am »
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Here's one way to do it. One thing he fails to mention in his instructions is that the last step is done in very tiny steps and compared to the jig. You don't bend it around the jig in one bend.

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http://www.instructables.com/id/How-to-bend-tubing/?ALLSTEPS


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« Reply #2 on: February 09, 2011, 11:50:37 am »
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If you have T-6 Aircraft type stuff , Good luck bending it.   It's Tempered.

Just take it to a Electrician and they can make the bend with a EMT jig or machine.

Muffler folks may be able to help too.

The sand thing has always worked for me if you go slow, slow, slow.

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« Reply #3 on: February 09, 2011, 11:51:38 am »
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In other instances I've used the sand but also put a spring/coil over the tubing. hhhmmm I'm wondering what would happen If you froze water inside but let the outside heat up just so it wasn't too brittle..

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Hecho por mí mismo
« Reply #4 on: August 13, 2013, 02:26:04 pm »
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Hello Wil: to curl in circle tube of aluminium (O=3/8 "). I am curling it manually about a small wheel of tricycle or of bicycle for children. Before it must extract the tire to do the work on the metallic rim only. Regards and graces.

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« Reply #5 on: August 13, 2013, 11:06:00 pm »
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Wil, I've had some experience. Enough to know that success depends on the diameter and wall thickness and alloy you are trying to bend. I worked for a T.V. retailer in the 1950's and we had to straighten a lot of bent TV antennas after storms. It was done by heating the kink with a propane torch and slowly straightening it out by hand. I later applied the same method to bending 3/8 inch gas line. Temperature control is critical and where you heat. You will have to practice to get a good bend. The minimum radius on gas pipe was about 4 inches. below that the sides kinked. I attempted to bend a 1" thin wall tube that was part of a lawn chair by packing it with sand and heating. As I recall it looked good but at about 45 degrees the outer wall cracked. When you bend a pipe or rod the outer wall has to stretch and there just wasn't enough material to streatch on this bend. I have bent many thin wall steel tubes building bicycle frames and use heat and sand packing. The secret to sand packing is keeping the sand packed. When you start the bend the sand inside the tube gets loose because the tube is lengthened. Stop and repack every few degrees. I made a screw plug that repacked the sand everytime I turned a screw on the plug. This worked very well. Gambol

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Offline nickel_n
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« Reply #6 on: August 14, 2013, 02:04:39 am »
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This short video clip it may help. Looks like an easy to construct  jig Wink     

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simple to construct pipe bender


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« Reply #7 on: August 14, 2013, 08:30:02 am »
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Quote:Posted by mfitzs70
hhhmmm I'm wondering what would happen If you froze water inside but let the outside heat up just so it wasn't too brittle..


I saw this technic in trumpets making process and other brass instruments.



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« Reply #8 on: August 14, 2013, 11:27:48 am »
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I think Brass is a bit more Elastic then Aluminum.   Aluminum cracks much faster.   Depending on the Tin Content of the Brass.


  Quote:   Posted by mfitzs70   
 hhhmmm I'm wondering what would happen If you froze water inside but let the outside heat up just so it wasn't too brittle..


Remember Metal too becomes more Brittle with cold.  Soft with the right heat.  I would think the hotter the metal the better.  If you heat up metal to the Annealing point it could become too soft to use. 

I've seen Aluminum so soft you could bend it just by putting a heavy book on it.   You don't want that.

This is why I use Pre Made Goodies.   This is the Ticket.   Cheap at the Yard, Second Hand and other places.

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http://images.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGNI_enUS539US539&q=Metal+cruches&biw=1366&bih=595&sei=jJ8LUsbAI43YyAHamYCYBg&tbm=isch


Turning the Handle the other way is Easy. Just drill out the Rivet and place a Screw.


 
 


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Offline fumducker
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« Reply #9 on: August 14, 2013, 10:39:13 pm »
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i've always used a spring over the tubing with great success bending brass and aluminum tubing. though the jig looks simple and efective

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