Is there any way that a strain gauge could be placed to actually measure the
impact loading on the drive sleeves?
Impulse forces can be immense. I can usually knock a well-clamped piece out
of alignment by a few good hammer-blows.
Thicker pins increase bearing surface area slowly.
Shaun
----- Original Message -----
From: "nigel_graham" <nigel_graham@intercept.com>
<ami@mcfadyean.freeserve.co.uk>; "'Peter Davis'" <pm.davis@ntlworld.com>;
<europa@avnet.co.uk>; "Fred Fillinger" <fillinger@ameritech.net>
Subject: Re: Tailplanes
>
> .................as long as the bolt SHANK is to act as the shear in both
> fore and aft
> locations or "double" as you say. If the length isn't sufficient the shear
> at the nut end will be taken by the thread .................
>
> Absolutrely right Bob. I don't have my notes to hand, but there is a
perfect
> AN4 bolt to suite.
>
> ........ The clamping action of the
> saddles will deplete as it gets further from the bolt...................
>
> Again, absolutely right, but this is intentionally so.
> The TP9 / TP12 sleeves can only clamp onto TP4 if they deform (or tend to
> deform) SLIGHTLY .
> In your "totally surrounded" solution, the clamping force may be so evenly
> distributed, that the TP9 TP12 bushes are prevented from distorting and
thus
> don't clamp onto the TP4 Torque tube. You may find that you need to cut
> expansion slots lengthways on the TP9 & TP12 bushes to get them to clamp
> properly (and I personally would not do that).
>
> .................... although not having any internal supports to the TP4
> Tube......................
>
> TP4 on the other hand, must not be allowed to deform at all - especially
in
> the area adjacent to the bronze bushes, since this could introduce some
> friction in the pitch control. That is why I introduced the supporting
> "Discs" .....and would recommend them for your system.
>
> Cheers
>
> Nigel
>
>
|