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Best Type Of Tubing?


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#11 NaturalFork

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Posted 08 December 2012 - 03:39 PM

here it is. 

 

IMG_20120828_185825.jpg



#12 Turtle

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Posted 09 December 2012 - 08:49 PM

Thanks for the pic, I'll have to have a look when my aluminum tubing arrives and see if I can get a good fit.



#13 Turtle

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Posted 10 December 2012 - 06:25 PM

My two favourite types would be Drawn Aluminium Tube (Not Extruded!) and Carbon Fibre Tube.

 

Both will set you back about $10 - $15 per metre, a little more for larger sizes.

 

http://www.capral.com.au/Drawn-Tubes

 

http://www.carbonfib...m.au/prod24.htm

Hrawk,

Can you elaborate a bit please on why you like drawn as opposed to extruded for blowguns?  I'm looking to get some

tubing and want to make an informed purchase.  Thanks.



#14 superman365

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Posted 11 December 2012 - 09:54 AM

To fix the sagging in pvc, heat up a 6in section of 3/4in pvc (for 1/2in) over the stove or heat gun until it is soft and pliable. Quickly slide the 3/4 in piece over the 1/2in until it is in the middle....this should fix the sagging

 

watch here    



#15 Hrawk

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Posted 11 December 2012 - 09:37 PM

PIPE & TUBING
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Aluminium Pipe and Tubing are hollow extrusions that are symmetrical with uniform wall thickness except as affected by corner radii. 

 

 

The cross section view of tubing can be round, hexagonal, octagonal, elliptical, square or rectangular with sharp or rounded corners. Within the aluminium extrusion product type classification "tube" there are two categories: "as extruded tube" and "drawn tube." Tube is sold in two configurations: coil and straight lengths.

 

 

Pipe is "as extruded straight length tube" in standardized combinations of outside diameter and wall thickness, commonly designated by "Nominal Pipe Sizes" and "ANSI Schedule Numbers."

Drawn Tube is tube brought to final dimensions by drawing through a die. The drawing process provides exceptional dimensional control and a superior finish. The drawing process is also cold work that provides tubing it's temper.

 

 

 

DRAWN TUBE
   
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"Drawn tube" for most applications is a better material choice than "as extruded tube".

Aluminium tubing are hollow extrusions that are symmetrical with uniform wall thickness except as affected by corner radii. Refer to Pipe and Tubing for the basics.

Drawn tube obtains its mechanical properties, characteristics, and dimensions by drawing "as extruded tube" through a die. In addition to adding strength, the drawing process provides exceptional dimensional control and a superior surface finish that would not be attainable in an extruded product of the same alloy and size. Drawing also enhances the bending, flaring and formability of tubing. Ovality can be controlled more precisely in the drawing process than in the extrusion process. Tempers for non-heat treatable alloys (3xxx series) are imparted through the drawing process (cold work/strain-hardened). The heat treatable alloys (6xxx Series) obtain their temper through heat treating at the conclusion of the drawing process. 



#16 jtilley

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Posted 11 December 2012 - 10:37 PM

I have made guns from copper, and pvc, with some small bore guns from aluminum arrow shafts with good results, but I have never used the metal electrical conduit due to the seam that runs down the inside, I was afraid this would affect my speed considerably. What do you guys do about the seam, or is it not enough to affect the dart?



#17 Hrawk

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Posted 11 December 2012 - 10:42 PM

I have made guns from copper, and pvc, with some small bore guns from aluminum arrow shafts with good results, but I have never used the metal electrical conduit due to the seam that runs down the inside, I was afraid this would affect my speed considerably. What do you guys do about the seam, or is it not enough to affect the dart?

 

Seamless tubing really is a must.

 

That seam is usually pretty rough on the inside even though it's been ground down on the outside.

 

You'll be dealing with a lot of friction, damage to darts and lack of a good air seal using seamed tubing.

 

You have two options with dealing with seamed tubing, ream it out to size or polish it out with a bore hone. Both a long and painful process and do require specialised tools.


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#18 jtilley

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Posted 11 December 2012 - 10:50 PM

I have thought about inserting thin walled pvc into metal conduit for a longer gun without a seam or barrel sag, kinda combine them for the best of both worlds, although it would be heavy, but I have never got around to seeing if it is even possible with the various sizes of pipe.



#19 superman365

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Posted 12 December 2012 - 07:52 AM

does anyone know if this stuff is seamless?

 

 

 

     

http://www.homedepot...51#.UMiLy5PjluE



#20 NaturalFork

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Posted 12 December 2012 - 03:22 PM

I think PVC would shoot very fast. Faster than aluminium. I will have to try the brace trick. Or stuff it into a bigger metal pipe. 






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