europa-list
[Top] [All Lists]

Tolerances

Subject: Tolerances
From: Graham Singleton <100421.2123@compuserve.com>
Date: Sun, 2 Jun 1996 17:50:01
>> As the module is still yet to be positioned in the fuselage and the wing
incidence set the alignment might all might move again.>>

It sure will. The trouble is that the cockpit module is too floppy to use as a
jig. It's also far from easy to judge the alignment of the wing. I suspect the
best way might be to cut off the back of the module, at the top front corner of
the tank, fit the front part of the module, then set the wing incidence. Now the
quick connect can be fitted accurately, the tank pushed in from the back and the
luggage bay stuck back on. This method would require a different way of laying
up the tank supports but might be less problematic than existing one. I have an
idea that something like this is being done by some of the guys fitting
aluminium tanks. Good on yer, mates!
Tell us if it works.

When we set our wing incidence the quick connects went out of alignment, a good
1/16" in one case. We sprung the bracket back into alignment then glassed it in.
We also put 3/16" pop rivets through the layup into the bracket so that if/when
the epoxy/aluminium bond lets go it will remain attached. Anodising will help it
to grip longer.

Here's a trick to help lining up your drill. Get hold of a small bubble level,
circular preferably and bond it to the drill. Then you can easily keep the drill
level (or vertical) Black & Decker sell a cordless with two bubbles in the
handle. You will need something like this when you come to drill the wing
hardpoints for the lift pins. Make sure all three pins are parallel, I think
with the flap down, although that's probably not too important because the flap
tube has a self aligning bush.

Graham



<Prev in Thread] Current Thread [Next in Thread>
  • Tolerances, Martin J . Tuck
    • Tolerances, Graham Singleton <=