[rebel-builders] rudder elevator bushings
Posted: Sun Feb 19, 2012 8:34 pm
Good questions, Rob. I didn't install bronze shoulder bearings yet, but have
thought of installing some when the plane comes apart before long for
painting. My recollection is the ones in the archive photos were custom
made. I don't have a lathe and am no machinist, but several months ago I
belatedly discovered a local machine shop where they enjoy making that sort
of thing -- cheaply! (Two new brake pistons for ~$30 !) For those bearings,
I'd just give them dimensions and turn them loose on the project.
The main point is I wish I had gotten to know the local machine shop(s)
earlier in my build process. It's amazing what they will happily produce for
very reasonable cost and, at least in my case, even after being told it's
for an airplane. They have a lot of neat tools to look at too. :)
Ron
http://n254mr.com
On Sun, Jan 2, 2011 at 8:33 AM, <schaumr@dcsol.com> wrote:
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thought of installing some when the plane comes apart before long for
painting. My recollection is the ones in the archive photos were custom
made. I don't have a lathe and am no machinist, but several months ago I
belatedly discovered a local machine shop where they enjoy making that sort
of thing -- cheaply! (Two new brake pistons for ~$30 !) For those bearings,
I'd just give them dimensions and turn them loose on the project.
The main point is I wish I had gotten to know the local machine shop(s)
earlier in my build process. It's amazing what they will happily produce for
very reasonable cost and, at least in my case, even after being told it's
for an airplane. They have a lot of neat tools to look at too. :)
Ron
http://n254mr.com
On Sun, Jan 2, 2011 at 8:33 AM, <schaumr@dcsol.com> wrote:
Happy New Year Everyone,
I've been researching the use of bushings/bearings at the lower rudder
bracket, and the inboard and outboard elevator brackets based on Ken's (and
others) posts. Consensus seems to be that bronze bushings at these
locations
will reduce the possibility of hole elongation, which has been reported
with the
currently MAM-supplied stainless steel 1/4 I.D. 3/8 O.D. units (albeit only
after
hundreds of hours on the airframe, it seems).
The Rebel files have nice photos of what appears to be MAM-supplied bronze
aileron bushings with an inside diameter of 3/8" to accommodate the
aforementioned SS bushings. These appear to have 1" (or greater) flange
diameters and allow the single rivet attach to the brackets to prevent
their
rotation. I can't find these anywhere on the web...have folks been
successful
in obtaining these from MAM recently?
Alternatively, one could use the more readily available "small flange"
oilite
bushings, but their narrower flanges make it difficult (impossible?) to
permanently affix to the attach brackets to prevent the bushing from
rotating
in its hole.
Aside from aiming for a good interference fit (I assume loc-tite won't work
on
an oillite bushing) what have others done here?
Rob
R786
Old Saybrook, CT
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