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Posted for Sky2high@aol.com:
In a message dated 8/14/2006 8:07:06 P.M. Central Standard Time,
tthibaultsprint@earthlink.net writes:
Scott wrote that the rivets on the doublers for the spinner back plate
should be bucked not squeezed.
Does anyone know why this is so? What other cases demand one method versus
the other?
Tom,
A squeezer compresses the flat end effectively, but soon the spread stop the
shaft form expanding. A bucked rivet ensures that the shaft will tightly
press against the sides of the hole, fully filling it and not allowing any
movement to work harden the rivet. Squeezed rivets are ok for
non-structural
work - nut plate holders, etc.
I have included additional pictures that usually aol will zip together. I
think Marv further alters the zip to compress them even more. I sent them
full size so that extreme detail is available.
Note that there are many solutions to providing some sort of bulkhead to
keep the spinner from working the back plate. BTW, I have an old unused
Lancair
back plate available - contact me directly if you are interested.
#13 is the bulkhead.
#16 is the pipe/flange used to turn the bulkhead on a lathe.
#12 shows where the bulkhead (a coat of RTV) meets the spinner.
#14 shows the prop close out pieces with riveted aluminum supports covered
with teflon tape.
#15 shows the orientation and doubler rivets (in this case, squeezed again)
- I doubt whether the double was needed.
Note, The back plate support bolts have the nuts torqued to 22 ft lbs - the
recommended value for holding the hub halves together.
I hope this gives you ideas for your next spinner/back plate.
Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
Abnegate Exigencies!
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