[NSRCA-discussion] wing tube sleeve hole

Sat Nov 10 07:50:21 AKST 2007

Lance,

To get around having to burn a hole and feed the wire thru this,
there is away to cut the tube hole by cutting a slot going into the tube
hole
from the top of the core.
You can incorporate this slot on the templates and do it all in one cut.
The only problem is that your wire will go into the slot if you wanted to go
around the inside of the tube hole more then once.

Karl G. Mueller
kgamueller at rogers.com

  ----- Original Message ----- 
  From: Lance Van Nostrand
  To: NSRCA Mailing List
  Sent: Friday, November 09, 2007 7:37 PM
  Subject: Re: [NSRCA-discussion] wing tube sleeve hole

  Thanks Karl, this is a good idea.  It produces a hole that looks very
clean.  My concern is how to get the template end that is inserted into the
wing into the precise location.  I didn't used to be too concerned with
this.  As long as the holes in the opposing wings were close they were good
enough because when I mount the wing tube in the fuse I would perfectly
align the wings.  Even if the wing tube was tilted, it would not matter.
However, now that we sell kits and people order replacement wings, or use
the wing tube itself to align with the stab, I feel I must have a method
that is repeatable to a very accurate degree.  Also, another difference from
the home builder to the production shop is time.  Your method looks like it
would be quick to do, but not as sure about the setup (having to burn the
initial hole and feed the wire).  I'm sure that with practice any method
becomes efficient.

  --Lance

    ----- Original Message ----- 
    From: Karl G. Mueller
    To: NSRCA Mailing List
    Sent: Friday, November 09, 2007 10:03 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

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