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Door tube frames

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mcolbeck

Joined: 31 Dec 2006
Posts: 13
Location: Cochrane, Alberta

Posted: Sun Oct 26, 2008 5:58 am Post subject: Door tube frames

Has anyone had any trouble with the pre bent tube frames for the doors? I created the template out of plywood so that the frame will just tuck inside the door opening. When I match that up to the pre bent tube from ZAC it is out. The frame is wider than my template so the tube would be hitting the sides when closing the doors. Does anyone have advice on the best way to re bend the 1/2" tubing? I think if I can bend again in a couple of places I will be able to get it where i need. I have heard of filling the tube with sugar or something?

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_________________
CH701 Builder and new flyer
Rudder, HS, and Elevator completed
Left wing Complete
50% complete on Right Wing
99% Complete on Fuselage
Engine installed almost ready to fire
Instrument panel and electrical Complete

lrm(at)skyhawg.com
Guest

Posted: Sun Oct 26, 2008 6:23 am Post subject: Door tube frames

Sand works, so I heard.  However, I've tried it and it still crimped.  I 

probably didn't pack it enough or something, Larry



mcolbeck wrote:

 	  Quote: 	
		   



 Has anyone had any trouble with the pre bent tube frames for the doors? I created the template out of plywood so that the frame will just tuck inside the door opening. When I match that up to the pre bent tube from ZAC it is out. The frame is wider than my template so the tube would be hitting the sides when closing the doors. Does anyone have advice on the best way to re bend the 1/2" tubing? I think if I can bend again in a couple of places I will be able to get it where i need. I have heard of filling the tube with sugar or something?



 --------

 CH701 Builder and new flyer

 Rudder, HS, and Elevator completed

 Left wing Complete

 50% complete on Right Wing

 99% Complete on Fuselage

 Engine installed almost ready to fire

 Instrument panel and electrical Complete





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p 10332#210332





   

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craig(at)craigandjean.com
Guest

Posted: Sun Oct 26, 2008 8:30 am Post subject: Door tube frames

I bent the canopy hoops on the 601XL by packing them with sand and bending

them around form blocks. But the hoops are a fairly large radius. For

reference the radius of my smallest form block was about 6 inches.



You do need a fair amount of force to make bends. My rig force the blocks

against the tube with large C-clamps.



One thing that helps lower the chance of kinking is to have a trough in the

form blocks that matches the cross-section of the tube.



-- Craig



--

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b.carl@sympatico.ca

Joined: 20 May 2008
Posts: 77

Posted: Sun Oct 26, 2008 10:47 am Post subject: Door tube frames

I built in 95 and made the mistake of bending the door tubes with too little 

clearance around the door frame causing interference making the doors hard 

to close. I built a set of bubble doors last winter and allowing 2" all 

around and found that much better. For bending I fill with sand and use 2' 

oak  form block (about 4" radius)with a routered 1/2"  groove to fit the 

pipe. Results were good with very little kinking.

Carl

701/912

---

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petes15515(at)msn.com
Guest

Posted: Mon Oct 27, 2008 8:42 am Post subject: Door tube frames

I found that buying a pulley wheel from my local hardware store worked for me when I scratch built the 701 frames. I clamped the wheel in a vise and placed the 1/2" tube in the pulley grove. With some care and gentle persuasion C the tube can be formed to the correct radius without kinking the tube

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