[TowerTalk] 3" Boom Joints

john at kk9a.com john at kk9a.com
Wed Sep 23 16:27:32 PDT 2009

The tolerances are pretty wide on extruded tubing (something like +/- .015 on the outside diameter and +/- 0.009 on the wall thickness), so whether is fits or not without machining is a crapshoot.  

John KK9A

  ----- Original Message ----- 
  From: TexasRF at aol.com 
  To: john at kk9a.com ; TOWERTALK at contesting.com 
  Sent: Wednesday, September 23, 2009 6:41 PM
  Subject: Re: [TowerTalk] 3" Boom Joints

  At onlinemetals.com 6061-T6 with 2.75 O.D. and .25" wall is listed for about $22 per ft. This diameter will require less machining to fit the i.d. of the 3" material.

  If the tolerances are out of phase, it might even fit with no machining.

  Gerald K5GW

  In a message dated 9/23/2009 4:52:20 P.M. Central Daylight Time, john at kk9a.com writes:
    For splices to 3 inch x 1/8 wall boom, I use 2 1/2" Schedule 40 6061-T6
    aluminum pipe.  The O.D. is 2.875 and the I.D. is 2.469.  Then I have the
    O.D. machined to 2.735 - 2.740.

    John KK9A

    To: <towertalk at contesting.com>
    Subject: [TowerTalk] 3" Boom Joints
    From: "Andre Van Wyk"
    Date: Tue, 22 Sep 2009 17:18:22 -0600

    I am planning the construction of 2 yagis, and I was wondering about "of the
    shelf" material to join 3" aluminum tube sections for very long booms.

    Any suggestions would be appreciated.

    de KR5DX 


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