[NSRCA-discussion] wing tube sleeve hole

[Karl G. Mueller]

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


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