Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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 Posted: Fri Mar 21, 2008 6:28 pm Post subject: Homebuilders special tailwheel swap |
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Thanks, Pat, I'll mark it on the calendar. Man, fly-ins.com is really
makin' the announcements these days!
Lynn
do not archive
On Mar 21, 2008, at 5:02 PM, patrick reilly wrote:
| Quote: | Lynn, I see the screws now on pg 96. I was looking in the
instrument section. I need them to mount instruments and the radio.
If you make it to the EAA Chp #22 Cotonwood airport June fly-in and
want to stay at my place over night, we'd love to have you.
Pat
> From: lynnmatt(at)jps.net
> Subject: Re: Homebuilders special tailwheel swap
> Date: Fri, 21 Mar 2008 07:50:27 -0400
> To: kitfox-list(at)matronics.com
>
>
>
> They are listed under "machine screws" in the index, and are on p.
> 96. Not under "brass screws" or "instrument screws" or on the same
> page, or in the same general vicinity as the instruments, as one
> would think, nor are they cross-referenced as one would hope.
> Aircraft Spruce could do itself a huge favor and do some cross-
> referencing in their index for us homebuilders, who don't always
know
> the proper name for something, myself being the "leader of that
> pack." : )
>
>
> Lynn Matteson
> Grass Lake, Michigan
> Kitfox IV Speedster w/Jabiru 2200
> flying w/480+ hrs/down for annual
>
>
>
> On Mar 20, 2008, at 10:24 PM, patrick reilly wrote:
>
> > Lynn, I need some of those 6-32 instrument screws. WHere in the
ACS
> > catalog did you find them? I looked and didn't see them.
> >
> > Pat
> >
> > > From: lynnmatt(at)jps.net
> > > Subject: Re: Homebuilders special tailwheel swap
> > > Date: Thu, 20 Mar 2008 19:29:52 -0400
> > > To: kitfox-list(at)matronics.com
> > >
> > >
<lynnmatt(at)jps.net>
> > >
> > > Well, wonder of wonders, Spruce finally got it right! Or did
they?
> > > When I ordered mine, taking the description "bearings" to
heart, I
> > > only got one, thinking it should be two, and returned it without
> > > thinking to see if it had a sleeve in it or not.
> > > Good report, Pat, but I think people who order the replacement
> > > bearings should ask if they are going to get one or two
bearings.
> > >
> > > I seem to be having a problem with getting the "right stuff"
from
> > > Spruce....I just received an order which included 6 brass
instrument
> > > screws of 6-32 size. I only needed 4, but knowing their
penchant for
> > > screwing up, I ordered 2 extras. Guess what? They sent 4
8-32's and
> > > 2 6-32's. The proper ones are on the way, after a phone call.
> > > Whenever I order from them, if it's only hardware items, I order
> > > extra, but this time they really screwed the pooch....and I
was the
> > > pooch. : )
> > >
> > > Lynn Matteson
> > > Grass Lake, Michigan
> > > Kitfox IV Speedster w/Jabiru 2200
> > > flying w/480+ hrs
> > > do not archive
> > >
> > >
> > > On Mar 20, 2008, at 5:52 PM, patrick reilly wrote:
> > >
> > > > Lynn, I ordered 2 of the bearings. (at) bearing arrived in a
seperate
> > > > plastic package that could be cut apart but mine were still
> > > > together. ACS charged $4.95 for both, not each. I couldn't
believe
> > > > it. The bearings are sealed and look to be good quality.
That is
> > > > dirt cheap. The bearings still needed a shim to fit down to
the
> > > > axle diameter. I filed and polished until I got a good
tight slip
> > > > fit. I really don't know how much I took off of the bushing
OD, as
> > > > I didn't mic it before I started.
> > > >
> > > > Pat Reilly
> > > > Mod 3 REbuild
> > > > Rockford, IL
> > > >
> > > > > From: lynnmatt(at)jps.net
> > > > > Subject: Re: Homebuilders special tailwheel
swap
> > > > > Date: Wed, 19 Mar 2008 23:49:19 -0400
> > > > > To: kitfox-list(at)matronics.com
> > > > >
> > > > >
> > <lynnmatt(at)jps.net>
> > > > >
> > > > > Thanks, Rex. Good info. But there isn't a gap in mine,
and if
> > there
> > > > > was, the inner race of the bearing might rotate around the
> > spacer/
> > > > > shim, instead of being fixed to the spacer/shim as it should
> > be. The
> > > > > inner race-to-shim fit must be a good push fit, not
sloppy in
> > any
> > > > > way. I hope I'm not misinterpreting you.
> > > > >
> > > > > Now I have a question for anybody that has ordered the
Spruce
> > > > > "longlife sealed ball bearings." Did you, Pat? I'm curious
> > about the
> > > > > size of the ID of these bearings. Did you still need the
shim/
> > > > spacer,
> > > > > or was the ID of these bearings .500" to fit the Maule axle?
> > > > > I had ordered the replacement "bearings"...plural...thinking
> > that I
> > > > > was getting two bearings, and only one showed up. I was so
> > pissed
> > > > > that I went to my local bearing dealer and bought bearings
> > there,
> > > > > and returned the one that Spruce sent with a complaint about
> > their
> > > > > poor description. Now I'm curious about whether those
bearings
> > > > were a
> > > > > direct fit to the Maule axle or not. If they are, there's no
> > need
> > > > for
> > > > > the tubing shim/spacer.
> > > > >
> > > > >
> > > > > Lynn Matteson
> > > > > Grass Lake, Michigan
> > > > > Kitfox IV Speedster w/Jabiru 2200
> > > > > flying w/480+ hrs
> > > > >
> > > > >
> > > > >
> > > > > On Mar 19, 2008, at 10:46 PM, Rexinator wrote:
> > > > >
> > > > > >
> > <hefferans(at)gmail.com>
> > > > > >
> > > > > > Lynn,
> > > > > > Back from my Bearing shop trip. First I'll answer your
> > > > question. By
> > > > > > "gap" I meant that tiny space between the O.D. of the
> > spacer/shim
> > > > > > and the I.D. of the bearings through which grease would
> > migrate
> > > > out
> > > > > > if the wheel were to be used as designed. In other words;
> > as the
> > > > > > original Maule wheel is designed by having a zerk fitting
> > in the
> > > > > > hub. (Where grease in injected into the hub, but better
> > bearings
> > > > > > were used). Since you used sealed bearings the zerk
fitting
> > is not
> > > > > > needed, but left in place. I will recommend the zerk
> > fitting be
> > > > > > replaced with a plug and will try to source a part for
that.
> > > > > > I plan to replace the existing bearings with the same type
> > as you
> > > > > > did, but my supplier was able to quote me a comparable
> > bearing at
> > > > > > $4 each! I actually showed him the print-out from
> > BocaBearings.com
> > > > > > and he used the same P/N for the quote. He only had one in
> > > > stock so
> > > > > > I'll go back Friday to pick them up. I did look at the one
> > he had
> > > > > > and it looked like the photos. It may be another brand,
but
> > should
> > > > > > be good. I suspect Boca Bearings are over priced. Perhaps
> > someone
> > > > > > expert about this subject could comment.
> > > > > > He also showed me a reducer bushing which which does
the same
> > > > thing
> > > > > > as the spacer you and others had to make for the 1/2"
to 5/8"
> > > > > > difference of the axle and bearing I.D. This one was
made of a
> > > > > > rolled steel tube which has a closed seam and is
plated. It
> > fits
> > > > > > easily (perhaps too easily) in the existing cheap bearings
> > of the
> > > > > > new wheel, but my application is to cut it to length to
> > work as a
> > > > > > internal spacer. >From your text you show understanding
of this
> > > > > > method. I will also add appropriate washers as spacers to
> > prevent
> > > > > > the nut or opposite axle shoulder from rubbing against the
> > bearing
> > > > > > seal. The intent is to capture the wheel/bearing assembly
> > on the
> > > > > > axle, not clamp it. Thus with any clamping pressure from
> > improper
> > > > > > assembly the axle nut would not place any undue side load
> > on the
> > > > > > inner races. Since the axle and nut use a cotter pin
the idea
> > > > is to
> > > > > > fix the nut at the point where minimal side to side
play is
> > > > > > attained. Shims may be used to fine tune the play. The
axle
> > nut
> > > > > > (for those not aware) is not to be tightened against the
> > > > bearing or
> > > > > > even the spacer.
> > > > > >
> > > > > > Hopefully my description here shows I understand the
> > concept for
> > > > > > proper wheel bearing assembly. Please, anyone, let me know
> > if it's
> > > > > > not clear enough as this is practice and preliminary
> > content for
> > > > > > the instructions to be used for the Wiki page. I will
be using
> > > > > > photos and will add text and arrows to them where it
helps.
> > > > > > Thanks in advance.
> > > > > >
> > > > > > --
> > > > > > Rex Hefferan
> > > > > > SE Colorado / K-II / 582-C / still waiting repairs
> > > > > >
> > > > > >
> > > > > > Lynn Matteson wrote:
> > > > > >
> > > > > >>
> > > > <lynnmatt(at)jps.net>
> > > > > >>
> > > > > >> Rex-
> > > > > >> I'm not sure what you meant by "The small gap between the
> > tube
> > > > > >> spacer and inner bearing races"... The way I did it,
there
> > is no
> > > > > >> small gap. The tube I used is 5/8" OD and 1/2" ID, and is
> > meant
> > > > > >> to be used as a "shim" between the size of the shaft...
> > 1/2", and
> > > > > >> the ID of the bearings that I got, which was 5/8". The
> > bearings
> > > > > >> that you cited are already 1/2" ID, so the tube spacer
is not
> > > > > >> required as a shim or sleeve. If you are using those Boca
> > > > > >> bearings that you mentioned, no sleeve is needed, but
> > maybe you
> > > > > >> are using it to prevent the inner races of the two
> > bearings from
> > > > > >> undo stress or load, if the nut is tightened too much.
> > That is a
> > > > > >> good idea. But in that circumstance, there should be no
> > gap as
> > > > > >> you mentioned. Am I reading you right?
> > > > > >> By the way, for those that haven't done this Spruce
> > Homebuilder's
> > > > > >> tailwheel swap, the bearings that come...or at least
those
> > that
> > > > > >> came with my tailwheel from Spruce...are bad news, in
that
> > they
> > > > > >> are rough to the feel when turned, and when my departed
> > bearing
> > > > > >> guy looked up the load application, he said they were
> > meant for
> > > > > >> the speed of a hand truck, or loading dolly. And they
were
> > Heim
> > > > > >> bearings....once a good name in bearings and maybe still
> > so, but
> > > > > >> these particular bearings don't belong in the
tailwheel of
> > our
> > > > > >> airplanes. These particular bearings have a sleeve in
them
> > which
> > > > > >> takes the ID down to 1/2", and when replacing these Heim
> > > > > >> bearings, I could find the proper 1.375" OD bearing,
but not
> > > > the .
> > > > > >> 500" ID. The only bearing that was available to the
bearing
> > > > > >> dealer that I dealt with was the 1.375" ID, but with .
> > 625" ID,
> > > > > >> hence my use of the shim/sleeve to make up the
difference in
> > > > > >> diameters between the bearing ID and axle OD. Then,
just to
> > > > > >> simplify matters, I made the sleeve sort of become a
> > "diameter-
> > > > > >> increasing" sleeve for the axle, and slid the wheel onto
> > it. My
> > > > > >> nut then bears upon this sleeve, and does not put a
> > sideways load
> > > > > >> on the inner race of the bearings. This is what must be
> > avoided.
> > > > > >> There can be no sideways load on a normal ball bearing.
> > Some ball
> > > > > >> bearings are designed to have a slight load on them,
but I
> > don't
> > > > > >> think they are in the $18 range for this size bearing.
> > > > > >>
> > > > > >> Lynn Matteson
> > > > > >> Grass Lake, Michigan
> > > > > >> Kitfox IV Speedster w/Jabiru 2200
> > > > > >> flying w/480+ hrs
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > &======
> > > > >
> > > > >
> > > > >
> > > >
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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