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tigermiller
Joined: 09 May 2007
Posts: 11
Location: Omaha, NE
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 Posted: Mon Nov 23, 2009 5:52 am Post subject: How to bend hoops? |
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601xl scratch builders C how did you bend the hoops for the rear turtle deck and the canopy?
Thanks
Dave Miller
[quote][b]
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Dave Miller |
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larry(at)macsmachine.com
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| Posted: Mon Nov 23, 2009 6:59 am Post subject: How to bend hoops? |
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Dave,
I found bending the bows for both fuselage and canopy were easy when
done on a flat surface and a few c-clamps and guides.
See the links below that'll show what's needed. For the tubing, it's
best if you make a wood plug for each end and fill the tube with
fine sand and shake it down tight before bending. Later, when the shape
is close, you can dispense with the sand and make minor adjustments.
This is done in small increments over a curve trace image of what you're
after. See links,
http://www.macsmachine.com/images/canopy/full/frontbowadjust.gif
http://www.macsmachine.com/images/canopy/full/frontbowbend.gif
This link shows the canopy as it progresses from early on to completion.
http://www.macsmachine.com/html/canopy.htm
Best regards,
Larry McFarland 601HDS at www.macsmachine.com
DAVID MILLER wrote:
| Quote: | 601xl scratch builders, how did you bend the hoops for the rear turtle
deck and the canopy?
Thanks
Dave Miller
*
*
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jonbateman(at)HOTMAIL.COM
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| Posted: Mon Nov 23, 2009 2:33 pm Post subject: How to bend hoops? |
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Hello Dave
I started off making the plywood templates per plans. Then took my 6 foot long tubes packed them full of sand and pulled them around the template. After the first bend I marked center on both tube and template.Next I made a tighter bend radious and screwed it to my work table along with a 1" x 2" backer plate spaced out 3/4" for the tube to lay in and hold it while bending. After that it is a matter of marking where you want to add a little more bend and working it slowly until you are satisfied. That worked great for the second tube the first tube was a little more difficult at least for me. the first atempt didn't work worth beans. So after the skin was clecoed in place into the second tube I took a piece of cardboard and traced the profile of the skin. This gave me a better pattern to work from plus as I got close C I was able to fit it to the skin until it just fell in place. Right or wrong it worked for me.
Jon B.
Sheet metal fab was complete now working towards upgrades.
From: tigermiller1595(at)msn.com
To: zenith-list(at)matronics.com
Subject: How to bend hoops?
Date: Mon C 23 Nov 2009 06:35:11 -0700
.ExternalClass .ecxhmmessage P {padding:0px;} .ExternalClass body.ecxhmmessage {font-size:10pt;font-family:Verdana;} 601xl scratch builders C how did you bend the hoops for the rear turtle deck and the canopy?
Thanks
Dave Miller
| Quote: |
lectric.com
/">www.buildersbooks.com
ebuilthelp.com
ww.matronics.com/contribution
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ronics.com
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Windows 7: It works the way you want. Learn more. [quote][b]
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craig(at)craigandjean.com
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| Posted: Mon Nov 23, 2009 3:11 pm Post subject: How to bend hoops? |
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For the canopy hoops (fore and aft) I built a template gauge to measure the shape of the canopy when it was resting on the fuselage. The canopy that came with my QBK was accurately trimmed from the factory. This was before the newer heavier canopies from Todd. Anyway the template gauge was just a large piece of ¼ inch Masonite in the shape of a “C” roughly an inch or two larger than the curve of the canopy. I placed sliding “fingers” around the curve every 3-6 inches so that they touched the canopy. To position the fingers I clamped them with binder clips. Once I had the curve I screwed the fingers in place. Position the templates in the plane of the hoops. I stiffened my templates by screwing a one by two along the straight edge away from the canopy. If this is unclear I can send pictures.
One critical point is the fore and aft position of the canopy. Too far forward and the canopy’s leading edge will hit the engine cowl when the canopy is raised. The number in the plans (or photo guide) worked well for me although I placed the canopy a little farther back (1/2 inch?). As best I can tell it is better for the canopy to be too far back rather than too far forward.
-- Craig
From: owner-zenith-list-server(at)matronics.com [mailto:owner-zenith-list-server(at)matronics.com] On Behalf Of Jon Bateman
Sent: Monday, November 23, 2009 3:33 PM
To: zenith-list(at)matronics.com
Subject: RE: How to bend hoops?
Hello Dave
I started off making the plywood templates per plans. Then took my 6 foot long tubes packed them full of sand and pulled them around the template. After the first bend I marked center on both tube and template.Next I made a tighter bend radious and screwed it to my work table along with a 1" x 2" backer plate spaced out 3/4" for the tube to lay in and hold it while bending. After that it is a matter of marking where you want to add a little more bend and working it slowly until you are satisfied. That worked great for the second tube the first tube was a little more difficult at least for me. the first atempt didn't work worth beans. So after the skin was clecoed in place into the second tube I took a piece of cardboard and traced the profile of the skin. This gave me a better pattern to work from plus as I got close, I was able to fit it to the skin until it just fell in place. Right or wrong it worked for me.
Jon B.
Sheet metal fab was complete now working towards upgrades.
From: tigermiller1595(at)msn.com
To: zenith-list(at)matronics.com
Subject: How to bend hoops?
Date: Mon, 23 Nov 2009 06:35:11 -0700
601xl scratch builders, how did you bend the hoops for the rear turtle deck and the canopy?
Thanks
Dave Miller | Quote: | | lectric.com/">www.buildersbooks.comebuilthelp.comww.matronics.com/contribution>http://www.matronics.com/Navigator?Zenith-Listronics.com |
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[quote][b]
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leinad
Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia
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craig(at)craigandjean.com
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| Posted: Mon Nov 23, 2009 5:53 pm Post subject: How to bend hoops? |
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When bending the hoops I found it easier to work from the center out (both
ways). Also the same bending jigs can open a bend up if you go too far.
Don't trim the tubes to length until all done - the extra length gives you a
handle and more leverage.
You need different radii along the tube so you need form blocks with
different radii.
I've attached a couple of photos.
-- Craig
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