Hi, Norm and list,
From: Norm
Sent: Saturday, August 25, 2012 6:28 PM
To: [email protected]
Subject: Re: [Liveaboard] New Flying Pig
A suggestion – if you haven't already done it:
I have, actually, but it’s a good reminder...
I have two squeeze bolts, which compress a slight gap, on the tail of the
flange/coupling. The shaft and flange are within .001 of each other so don’t
have a lot of slop. That wasn’t tightened until the end.
I also have a 1/4 hole opposite the key on my flange/coupling (which, by the
way, was trued along with my shaft; it was .004 out, which could have
contributed to my mid-shaft whip for which the intermediate bearing that I
finally had to cut off was installed to cure/damp). That's drilled and tapped
for a cone-point bolt to meet the drill-out receiver in the shaft.
That's got a square, holed head for only 4 sides to strongly apply a wrench,
and then later mouse.
I centered the hole and the drill-out, and set the screw before I moused it to
the gap of one of the side bolts (which I then tightened, preventing any damage
to the aircraft wire which were in the slot, over the bolt).
I brought the flange to the transmission and feeler-gauged it to be somewhere
between .0025 and .003 out (up to the hard-mounted point, .002 fit on the
opposing pair at right angles, and I could barely get a .003 gauge into the far
side), well within the recommended .004 tolerance. Once I’d confirmed that
measure on all 4 bolts (same position tight each time despite removal and
rotating the shaft 1/4 turn x 4), I tightened them. Actually, with flexible
mounts, I can't see how it makes much difference, but I did it anyway :{))
Thanks for the suggestion. I can’t claim to have lost a shaft, but I have
pulled a transmission out, with no ill effects – and that’s part of why I am
going back to a standard packing gland (that, and that it also would damp any
mid-range whip, which I believe I will have killed in any case).
L8R
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