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601 Crimp details

 
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zenith-list(at)steensland
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PostPosted: Mon Feb 18, 2008 3:21 pm    Post subject: 601 Crimp details Reply with quote

Eureka!

I now have a seat at the table. Got my plans for the 601xl on
valentines day of all things.

After reading through the plans a few times I see a few things that my
detailed orientated brain needs to know.

Can anyone detail the crimps on the tail and wing nose ribs? I have seen
a few people use routers to cut them but leave out the little detail of
type of bit used, etc. They appear to be 12mm across and about that deep.

Also, with all the brake plans that I have seen, everyone seems so
focused on all the 1/8" radius bends the on the 601. Has anyone
considered the 1/4" radius bends that are required? There are far fewer
1/4" radius bends, but they are there. What modifications to a brake
are required to change the radius. I'm sure a solution will present itself.


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Ron Lendon



Joined: 10 Jan 2006
Posts: 685
Location: Clinton Twp., MI

PostPosted: Mon Feb 18, 2008 4:38 pm    Post subject: Re: 601 Crimp details Reply with quote

Welcome to the wonderful world of airplane building.

The size and shape of the crimps are not as important as their location. The crimps are there just to gather the extra metal. I scratch built and put them in the forms with a 3/4" dia. sanding drum chucked in a hand held die grinder.

Here is the log entry:

http://mykitlog.com/users/display_log.php?user=rlendon&project=113&category=0&log=19861&row=326

About the radius issue, more will be revealed as you learn and do.


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Ron Lendon
WW Corvair with Roy's Garage 5th bearing
CH 601 XLB
N601LT - Flying
http://www.mykitlog.com/rlendon
Corvair Engine Prints:
https://sites.google.com/site/corvairenginedata/
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leinad



Joined: 19 Sep 2006
Posts: 283
Location: Central Virginia

PostPosted: Mon Feb 18, 2008 4:54 pm    Post subject: Re: 601 Crimp details Reply with quote

To make crimps on my form blocks I used a rotary rasp in a drill motor. The one I used was about 3/4" at the wide end then tapers to almost a point. It makes very nice tapered crimps. I think I purchased it at Sears.
Most of the 1/4 inch radius are on thicker material that I bend over a wooden form in my vice with a mallet. I use a good hard wood, like maple to make these forms. I first cut the edge away so that it is sharper than a 90, more like 70 degrees to take care of spring back, and round the edge with a rasp and sand paper until I've got the radius I want.

Check out the tools link on my web sight.
http:\\daniel.dempseyfamily.us

I also use a wooden bending brake, but that's another story.
Dan 601xl Dempsey
zenith-list(at)steensland wrote:
Eureka!

I now have a seat at the table. Got my plans for the 601xl on
valentines day of all things.

After reading through the plans a few times I see a few things that my
detailed orientated brain needs to know.

Can anyone detail the crimps on the tail and wing nose ribs? I have seen
a few people use routers to cut them but leave out the little detail of
type of bit used, etc. They appear to be 12mm across and about that deep.

Also, with all the brake plans that I have seen, everyone seems so
focused on all the 1/8" radius bends the on the 601. Has anyone
considered the 1/4" radius bends that are required? There are far fewer
1/4" radius bends, but they are there. What modifications to a brake
are required to change the radius. I'm sure a solution will present itself.


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Scratch building XL with Corvair Engine
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Kevin Bonds



Joined: 09 Jan 2006
Posts: 171
Location: Nashville, Tn

PostPosted: Mon Feb 18, 2008 5:35 pm    Post subject: 601 Crimp details Reply with quote

Lee

Folks like us (people who come up with these wild ideas like building our own airplane) tend to want to obsess over the details. We want to have everything figured out immediately. But remember, this thing is going to be built one part at a time. Just get busy working on a part. You' ll find a solution to the unknowns in due time. There is nothing on this plane you wont be able to accomplish if you just get busy on it. I didn't bother putting the crimp reliefs in my blocks. Tried it, Didn't need them. Some like them but, you'll have to finish the bend a little by hand, no matter what, so I didn't bother. Your results may vary. I put a page on my site for new builders here

http://home.comcast.net/~kevinbonds/new_builders.htm

Not that I'm an expert or anything. But, I thought it might serve as a reminder to not obsess. I am notorious about obsessing and taking too long to do something. I have been making a conscious effort, lately, to change this detail about myself.

Kevin Bonds
Nashville Tn
http://home.comcast.net/~kevinbonds/


Lee Steensland wrote: [quote]--> Zenith-List message posted by: Lee Steensland <zenith-list(at)steensland.net> (zenith-list(at)steensland.net)

Eureka!

I now have a seat at the table. Got my plans for the 601xl on valentines day of all things.

[b]


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KevinBonds
Nashville, TN
Plans-building Zenith CH601XL w/Corvair Power
http://home.comcast.net/~kevinbonds
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planecrazydld(at)yahoo.co
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PostPosted: Mon Feb 18, 2008 5:41 pm    Post subject: 601 Crimp details Reply with quote

Hello Lee;

The 1/4" radius was managed many moons ago in the big name manufacturer's experimental department by bending shims on the 1/8" radius until you had a stack thick enough to generate the more ample radius bends. Make the shims longer than the part top be bent and tape the stack to the brake nose to the side of the actual part edges.

Lee Steensland <zenith-list(at)steensland.net> wrote:[quote] --> Zenith-List message posted by: Lee Steensland

Eureka!

I now have a seat at the table. Got my plans for the 601xl on
valentines day of all things.

After reading through the plans a few times I see a few things that my
detailed orientated brain needs to know.

Can anyone detail the crimps on the tail and wing nose ribs? I have seen
a few people use routers to cut them Be a better friend, newshound, and [quote][b]


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