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Old 03-27-2017, 08:50 AM   #1
chiru
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Default Bushing dimensions

Hello,

In the AS2 plans, there are different sizes of bushings for a use with the same bolt :
- 3/8 0.058 -> inside diameter = 0.259
- 3/8 0.065 -> inside diameter = 0.245

but a bolt AN4 has a minimum diameter of 0.246. Therefore the 0.065 bushing is too tight and has to be drilled/reamed with 1/4.

The same apply for
- 1/2 0.058, inside 0.384
- 1/2 0.065, inside 0.370
and AN6 that is min 0.371.

Is it done on purpose in order to have a reamed hole that is tighter than the 0.058 ? (with a 3/8 reamer, 0.375 it's closer to 0.371 than 0.384)
Or is it just a mistake on the plans ?


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Old 03-27-2017, 11:18 AM   #2
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There are some places where bushing stock is used rather than 4130 so that it can be reamed after welding in which case you would use the .065 wall tube. Where is the application in question?


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Old 03-27-2017, 12:19 PM   #3
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Hi Neil,

I am working on the horizontal stab and rudder. The bushings on the forward stab mount are 3/8 x 0.058 while the elevators and rudder attachments are 3/8 x 0.065. All use AN4 bolts.
There are also other examples, like on the idler for the elevator command station 6(push tubes, sheet 7.0).
What is the difference between bushing stock and 4130 ?

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Old 03-27-2017, 03:52 PM   #4
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Hello Chiru,

Bushing stock is mild steel. It will be a little easier to ream or drill than 4130 steel. It does not matter if you use .058" or .065" as is any case you will have to clean the hole after welding either by drilling or reaming

You can buy Bushing Stock from Aircraft Spruce, but if you already have some 4130 steel laying, then just use that . Does not matter much.
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Old 03-27-2017, 11:45 PM   #5
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Bushing stock is usually 1018 or 1020 mild steel (low carbon) as has been stated. I like to use it anytime I know I will be reaming the hole for a bolt. Using the .065" wall assures that you will get a clean hole after reaming. I have had 4130 get hard spots in it that made reaming difficult.
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Old 08-11-2017, 01:58 PM   #6
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Christian,
Did you do the rudder or fin yet?
i may have them for you.
Factory made fin by WagAero.
The rudder has a good post with hinges but needs new ribs and trailing edge.
Acro tail 2017-08-11-08-55-40_AATSC_resized.jpg  
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Old 08-11-2017, 02:21 PM   #7
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Hi Dennis,
Thank you for your offer but I have them both.
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Old 08-11-2017, 03:36 PM   #8
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Neil makes a good point. I use 4130 because that's what I have but I have encountered hardened areas more than once after welding that could not be drilled and/or reamed. I understood what was happening so I just tried again usually with better luck. Didn't happen that often but it's a b..... when it does, usually on a part that is nasty to fix or do over.

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Old 08-12-2017, 01:34 AM   #9
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Christian,
i have Bungie struts and cabanes also.
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How can you not be romantic about biplanes.
If your Father is poor it's fate, if your Father-in-law is poor it's stupidity
Wilbur Wright said he "did not have time for both a wife and an airplane."
Which is the better portion -- bondage bought with a ring,
Or a harem of dusky beauties, fifty tied in a string?
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Old 08-12-2017, 10:38 AM   #10
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Hi Dennis, that's where I stand.
The cabane could be useful. For the landing gear I just bought springs. Do you have some pictures ?
Thank you
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Old 08-12-2017, 02:29 PM   #11
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Nice workshop....don't mind me.
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Old 08-12-2017, 02:46 PM   #12
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Christian,
i do not see the fin in your photo, are you sure you do not need it.
i will ship cabanes and fin free if you give me your address.
E-mail me at;
race53@comcast.net
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How can you not be romantic about biplanes.
If your Father is poor it's fate, if your Father-in-law is poor it's stupidity
Wilbur Wright said he "did not have time for both a wife and an airplane."
Which is the better portion -- bondage bought with a ring,
Or a harem of dusky beauties, fifty tied in a string?
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Old 08-12-2017, 06:18 PM   #13
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Thanks you
The fin is just not welded.


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