[NSRCA-discussion] wing tube sleeve hole
george w. kennie
geobet at gis.net
Fri Nov 9 07:34:51 AKST 2007
When I first tried to do this on my own, I made a jig that I fastened to the front of the bench that my drill press was mounted on and rotated the press head to the back side of the shaft so that it overhung the bench side and drilled the hole vertically with a spade bit and yes it worked, but I had foam beads all over the house. They were in the kitchen, the bathroom, I even had them in my bed ( it's amazing what my wife puts up with ).
Then I purchased a KISS unit from Sam Turner and discovered his method for gluing a piece of sandpaper to the end of a 7/8ths dia. tube. I then built an alignment jig with adjustable length feet at the four corners so I could set the dihedral angle and that held the tube at 90 degrees to the root rib and hand drilled the hole to the depth marked on the 7/8ths tube and voila, perfect hole !
It was an acceptable method, but I no longer build foamcore wings as I can achieve significantly lighter panels going built-up. I do, however, like the sound of Lance's coring method so don't cast me in the mold.
G.
----- Original Message -----
From: Karl G. Mueller
To: NSRCA Mailing List
Sent: Friday, November 09, 2007 11:03 AM
Subject: Re: [NSRCA-discussion] wing tube sleeve hole
Lance,
I have cut the holes for the wing tube socket with a hot wire
and two templates mounted to the work bench at the proper
height to be on center of where the tube hole should be.
The socket hole is cut before cutting the core itself.
You need to make a slot in the core where the end support of the
tube is going to be to insert the template that is mounted to the bench.
I then burn a small hole thru the center of the templates in the
core with a hot piece of music wire held in a small machine vice
that is guided along a straight edge. Then I thread the wire for the
cutting bow thru that hole and start cutting following the two
templates. Start with a low heat and try the fit. If the fit is too tight
just increase the voltage a little and go around the templates again
until you achieve the proper fit. Of course you need a variable power
supply. Sounds more complicated than it really is. Now when you
cut the core, adjust your tip template to get the proper dihedral. Works
for me.
Karl G. Mueller
kgamueller at rogers.com
----- Original Message -----
From: Lance Van Nostrand
To: NSRCA Mailing List
Sent: Thursday, November 08, 2007 10:46 PM
Subject: Re: [NSRCA-discussion] wing tube sleeve hole
That's a hard one, Mike. Both Terry and I use a similar method. We had a machine shop make a jig for the cutter. The cutter is a length of 7/8" wing tube with a ground sharp edge, but the jig to hold it has got to be made presicely. I used to use a seemingly accurate jig made to the plans provided in a KFactor several years ago, but my results were not good enough.
--Lance
----- Original Message -----
From: Mike Miller
To: nsrca-discussion at lists.nsrca.org
Sent: Thursday, November 08, 2007 7:08 PM
Subject: [NSRCA-discussion] wing tube sleeve hole
http://www.mackrc.net/patternwings2/index.htm
http://www.nextcraft.com/foamwingsandparts.html
Terry Brox's web site on balsa skinned wings is very good and does show the drilling of the servo lead hole with a tube and by hand.
Their is some great information on these sites on building foam core wings. But a very important part of a plug in wing would be the wing tube sleeve hole in the core, to be straight and parallel to the desired line centered and at the right angle to set the dihedral. Is there a site that explains or shows the process of set up and drilling of this hole? If this step is not perfect looks to me like the wing is dead no matter how good the skinning process is.
Thanks in advance
Mike
--------------------------------------------------------------------------
_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
----------------------------------------------------------------------------
_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
------------------------------------------------------------------------------
_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20071109/17148eb8/attachment.html
More information about the NSRCA-discussion
mailing list