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Bending 6-B-21-1 & 2

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wjones(at)brazoriainet.co
Guest

Posted: Fri Jun 08, 2007 5:06 pm Post subject: Bending 6-B-21-1 & 2

Hello group ,I asked for some advice about a week  ago on bending these tubes .I received some good ideas from several of you good  people .Today I received my material from AS .I made the forms from 3/4" MDF  today .My plan is to mount the forms to my table and try to bend to shape around  the forms .May have to pack with sand as Larry suggested .Anyone see any  problems in doing it this way, maybe I should have ordered additional  material for screw ups.  Thanks          DO NOT  ARCHIVE

 Wade Jones    South Texas 

601XL  plans building

Cont. 0200

   [quote][b]

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craig(at)craigandjean.com
Guest

Posted: Fri Jun 08, 2007 5:48 pm Post subject: Bending 6-B-21-1 & 2

You can do the initial bend on the form by just grabbing  the ends and pulling. This may take two people as the tube is so long. But due  to spring-back you will have to use a tighter radius form to bring it to final  shape. So after the first bend the form is just your template. I started with a  10 inch radius but had to finish the ends with a 5-6 inch radius. You might be  able to skip the sand if your forms support the circular cross-section of the  tube but why make the potentially expensive experiment? I just filled mine with  sand, plugged both ends with some rubber stoppers from Home Depot held on with  duct tape.

  

 For me the process that worked best was to mark off  sections on the tube with matching marks on the the form and work on sections  proceeding from the center of the tube toward the ends. That way you aren't  trying to adjust bends all over. If you overbend you *can* correct. Just don't  do it too often in a given section as you will start work-hardening the tube.  After a few bends I was able to get a feel for the spring-back. I was able to do  one tube in an evening. BE PATIENT!

  

 -- Craig



  

   [quote][b]

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larry(at)macsmachine.com
Guest

Posted: Sat Jun 09, 2007 5:50 am Post subject: Bending 6-B-21-1 & 2

Hi Wade,

You want to pack the tubes with sand because it will prevent the tube 

from kinking as you go.  The forms will get you half way,

but you should try the 3-point bend setup using casters, block tubes and 

c-clamps to get it exactly right.  You only have to bend

just a little at a time and lay it over the form outline to get it 

extremely close.  This arrangement will permit you  to also unbend a little

here and there as necessary.  No need for excess material if you take 

your time.

http://www.macsmachine.com/images/fuselage/full/tubebender.gif



Larry McFarland

wade jones wrote:

 	  Quote: 	
		   Hello group ,I asked for some advice about a week ago on bending these 

 tubes .I received some good ideas from several of you good people 

 .Today I received my material from AS .I made the forms from 3/4" MDF 

 today .My plan is to mount the forms to my table and try to bend to 

 shape around the forms .May have to pack with sand as Larry suggested 

 .Anyone see any problems in doing it this way, maybe I should 

 have ordered additional material for screw ups. Thanks          DO NOT 

 ARCHIVE

 Wade Jones    South Texas

 601XL plans building

 Cont. 0200

 *

 *

- The Matronics Zenith-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Zenith-List

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