Today's Message Index:
----------------------
1. 12:39 AM - wing bolts (Mark Jefferies)
2. 09:31 AM - Re: wing bolts (bob fitz)
3. 02:32 PM - Wing Bolts (Lou Dakos)
4. 06:20 PM - Re: Wing Bolts (staar)
5. 11:10 PM - Re: Wing Bolts (Walt Lannon)
6. 11:32 PM - Re: Wing Bolts tests=QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_02_03, SUBJECT_IS_LIST,USER_AGENT_OE,USER_IN_WHITELIST version=2.43 (staar)
Message 1
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "Mark Jefferies" <mark@yakuk.com>
hi Frank.
you are right taking the holes to next size, if you don't they will wear oval.
for the YAK 52 you can get .2mm oversize bolts.
take care reaming the holes. When we do it, we make an extension to the reamer
to drive it evenly with a T bar.. We are using an adjustable reamer a nibble at
a time. this way we can be sure of the exact hole size to match the bolt.
if you are making bolts I suggest S98D as the material but do have your existing
bolts material analysed to be sure of using a better material. You may like
to have the bolt ground to size rather than turned.
Best regards, Mark Jefferies
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "bob fitz" <rmfitz@direcway.com>
Mark,Frank,Lou:
We look at the wing attachment bolts at annual and they seem to be so
massive I never expected them to be a problem. (Thanks for giving me
something new to worry about ;).Is this pitting visable without removing
the bolts? If not,why did you remove them? Is reaming/replacing common
on 52's? Any pattern to planes needing this done? (age,acro,etc.) TIA.
bob fitzpatrick
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Mark Jefferies
Subject: Yak-List: wing bolts
--> Yak-List message posted by: "Mark Jefferies" <mark@yakuk.com>
hi Frank.
you are right taking the holes to next size, if you don't they will wear
oval.
for the YAK 52 you can get .2mm oversize bolts.
take care reaming the holes. When we do it, we make an extension to the
reamer to drive it evenly with a T bar.. We are using an adjustable
reamer a nibble at a time. this way we can be sure of the exact hole
size to match the bolt.
if you are making bolts I suggest S98D as the material but do have your
existing bolts material analysed to be sure of using a better material.
You may like to have the bolt ground to size rather than turned.
Best regards, Mark Jefferies
=
direct advertising on the Matronics Forums.
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "Lou Dakos" <lou_dakos@bordermail.com.au>
G'Day Yakers
I didn't mean to worry anybody about wing attachment but my aircraft is one of
18 that was imported to Australia about 7 years ago they were all a bit rough
but sound, the chinnese had not preserved them at all when they de-commissioned
them so a lot of the steel components had rusted I have already replaced engine
mount support and minor other steel bits the wing attachment points when cleaned
up show very small pitting and as I have not skimped on my restoration
so far (5 years of work) and my arse will be in it I will be reaming the holes,
I only need a couple of thou. I dont know if this is a common problem but I
would think that if one is around there could be more, it is not very hard to
pop a bolt out and check holes.
Regards Lou
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
--> Yak-List message posted by: "staar" <staar@volcano.net>
G'Day Mates
Just a thought, If It were me trying to fill some pits in the wing attach
points, I would try an engine rebuilder, they plate or coat crankshafts with
a very hard metal . They can remove all of the rust then coat the parts to
fill the pits. You might have them do the attach points and then re-ream
them to their original size. I have removed all of the attach points on the
wing and stub wing for a project that I am working on, and all I did was
bead blast them, have them cad plated and re-installed them, not that bad of
a task, just takes some time.
RT
----- Original Message -----
From: "Lou Dakos" <lou_dakos@bordermail.com.au>
Subject: Yak-List: Wing Bolts
> --> Yak-List message posted by: "Lou Dakos" <lou_dakos@bordermail.com.au>
>
> G'Day Yakers
> I didn't mean to worry anybody about wing attachment but my aircraft is
one of 18 that was imported to Australia about 7 years ago they were all a
bit rough but sound, the chinnese had not preserved them at all when they
de-commissioned them so a lot of the steel components had rusted I have
already replaced engine mount support and minor other steel bits the wing
attachment points when cleaned up show very small pitting and as I have not
skimped on my restoration so far (5 years of work) and my arse will be in it
I will be reaming the holes, I only need a couple of thou. I dont know if
this is a common problem but I would think that if one is around there could
be more, it is not very hard to pop a bolt out and check holes.
>
> Regards Lou
>
>
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
tests=QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_02_03,
SUBJECT_IS_LIST,USER_AGENT_OE,USER_IN_WHITELIST
version=2.43
--> Yak-List message posted by: "Walt Lannon" <lannon@look.ca>
----- Original Message -----
From: "staar" <staar@volcano.net>
Subject: Re: Yak-List: Wing Bolts
> --> Yak-List message posted by: "staar" <staar@volcano.net>
>
> G'Day Mates
>
> Just a thought, If It were me trying to fill some pits in the wing attach
> points, I would try an engine rebuilder, they plate or coat crankshafts
with
> a very hard metal . They can remove all of the rust then coat the parts to
> fill the pits. You might have them do the attach points and then re-ream
> them to their original size.
Wrong! The pits are still there whether they are filled or not. The danger
of pitting caused by corrosion is the concentration of stress at the pit
location rather than being distributed over the whole bearing area. This
will result in fatigue cracking originating at the bottom of the pit.
In the case of wing attach fittings of the CJ (and Yak 52?) type there are
only two acceptable repairs;
1. Ream or hone the bores to remove ALL traces of corrosion pitting. If
still within approved repair limits fit oversize bolts. The Chinese did have
oversize bolts so it would be reasonable to accept their diameter as the
repair limit.
2. Replace the attach fittings.
I have removed all of the attach points on the
> wing and stub wing for a project that I am working on, and all I did was
> bead blast them, have them cad plated and re-installed them, not that bad
of
> a task, just takes some time.
Very good plan providing that the cadmium plating was done by an approved
repair facility that applies the correct baking procedure for the material
to avoid hydrogen embrittlement and subsequent failure. In addition, the
bore surface should not be plated. If the bores are not worn you would have
to remove the plating in order to fit the bolts. If they are worn oversize
cad. or zinc plating is too soft for this purpose. Rework within limit and
install oversize bolt.
Walt
>
> RT
>
>
> ----- Original Message -----
> From: "Lou Dakos" <lou_dakos@bordermail.com.au>
> To: <yak-list@matronics.com>
> Subject: Yak-List: Wing Bolts
>
>
> > --> Yak-List message posted by: "Lou Dakos"
<lou_dakos@bordermail.com.au>
> >
> > G'Day Yakers
> > I didn't mean to worry anybody about wing attachment but my aircraft is
> one of 18 that was imported to Australia about 7 years ago they were all a
> bit rough but sound, the chinnese had not preserved them at all when they
> de-commissioned them so a lot of the steel components had rusted I have
> already replaced engine mount support and minor other steel bits the wing
> attachment points when cleaned up show very small pitting and as I have
not
> skimped on my restoration so far (5 years of work) and my arse will be in
it
> I will be reaming the holes, I only need a couple of thou. I dont know if
> this is a common problem but I would think that if one is around there
could
> be more, it is not very hard to pop a bolt out and check holes.
> >
> > Regards Lou
> >
> >
>
>
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Wing Bolts tests=QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_02_03, |
SUBJECT_IS_LIST,USER_AGENT_OE,USER_IN_WHITELIST
version=2.43
--> Yak-List message posted by: "staar" <staar@volcano.net>
Wrong
The process I'm speaking of is used to repair crankshafts journals and you
don't know what the process is. Number 2 , these are EXPERIMENTAL aircraft
you don't need any "approved process" to do anything on them. So tell me
just what process did the Chinese and the Russians use and how were they
approved? That is why you need permission from the FAA to fly them to and
from airshows.
----- Original Message -----
From: "Walt Lannon" <lannon@look.ca>
Subject: Re: Yak-List: Wing Bolts
tests=QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_02_03,
SUBJECT_IS_LIST,USER_AGENT_OE,USER_IN_WHITELIST version=2.43
> --> Yak-List message posted by: "Walt Lannon" <lannon@look.ca>
>
>
> ----- Original Message -----
> From: "staar" <staar@volcano.net>
> To: <yak-list@matronics.com>
> Subject: Re: Yak-List: Wing Bolts
>
>
> > --> Yak-List message posted by: "staar" <staar@volcano.net>
> >
> > G'Day Mates
> >
> > Just a thought, If It were me trying to fill some pits in the wing
attach
> > points, I would try an engine rebuilder, they plate or coat crankshafts
> with
> > a very hard metal . They can remove all of the rust then coat the parts
to
> > fill the pits. You might have them do the attach points and then re-ream
> > them to their original size.
>
> Wrong! The pits are still there whether they are filled or not. The danger
> of pitting caused by corrosion is the concentration of stress at the pit
> location rather than being distributed over the whole bearing area. This
> will result in fatigue cracking originating at the bottom of the pit.
> In the case of wing attach fittings of the CJ (and Yak 52?) type there are
> only two acceptable repairs;
>
> 1. Ream or hone the bores to remove ALL traces of corrosion pitting. If
> still within approved repair limits fit oversize bolts. The Chinese did
have
> oversize bolts so it would be reasonable to accept their diameter as the
> repair limit.
> 2. Replace the attach fittings.
>
> I have removed all of the attach points on the
> > wing and stub wing for a project that I am working on, and all I did was
> > bead blast them, have them cad plated and re-installed them, not that
bad
> of
> > a task, just takes some time.
>
> Very good plan providing that the cadmium plating was done by an approved
> repair facility that applies the correct baking procedure for the material
> to avoid hydrogen embrittlement and subsequent failure. In addition, the
> bore surface should not be plated. If the bores are not worn you would
have
> to remove the plating in order to fit the bolts. If they are worn oversize
> cad. or zinc plating is too soft for this purpose. Rework within limit
and
> install oversize bolt.
>
> Walt
> >
> > RT
> >
> >
> > ----- Original Message -----
> > From: "Lou Dakos" <lou_dakos@bordermail.com.au>
> > To: <yak-list@matronics.com>
> > Subject: Yak-List: Wing Bolts
> >
> >
> > > --> Yak-List message posted by: "Lou Dakos"
> <lou_dakos@bordermail.com.au>
> > >
> > > G'Day Yakers
> > > I didn't mean to worry anybody about wing attachment but my aircraft
is
> > one of 18 that was imported to Australia about 7 years ago they were all
a
> > bit rough but sound, the chinnese had not preserved them at all when
they
> > de-commissioned them so a lot of the steel components had rusted I have
> > already replaced engine mount support and minor other steel bits the
wing
> > attachment points when cleaned up show very small pitting and as I have
> not
> > skimped on my restoration so far (5 years of work) and my arse will be
in
> it
> > I will be reaming the holes, I only need a couple of thou. I dont know
if
> > this is a common problem but I would think that if one is around there
> could
> > be more, it is not very hard to pop a bolt out and check holes.
> > >
> > > Regards Lou
> > >
> > >
> >
> >
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|