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Thread: A7 horn vibration reducing mix

  1. #11
    Senior Hostboard Member LowOhms's Avatar
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    Re: A7 horn vibration reducing mix

    Quote Originally Posted by bowtie427ss View Post
    To give you an idea of how long ago i built them, the build pics are locked up in a PC with a failed hard disk, It's a windows 3.1 machine that was upgraded to win 95 when it came out.

    The braces i used were as shown in the factory drawings. When i was cutting and sanding, i simply made a dozen instead of 8, and centered the additional brace between the factory braces on each flare. I have seen other builds using as many as 6 braces behind each flare. I made the flare's themselves out of 3/8 fir plywood as i was told it was the strongest/densest ply you can get to bend well. It gives you nasty splinters too.

    They look pretty much like this except cut from 7/8 x 3 red oak:

    1
    Thanks, time to saw those 1 by 2 Oak pieces, can add four, as middle ones, for stereo. Give me a week or two Elitopus1 !!


    Glue suggestions, for wood working NOVICEs ??


    Thanks for the A++ effort Bowtie !!


    Jeff Medwin.....Low Ohms.

  2. #12
    Senior Hostboard Member Elitopus1's Avatar
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    Re: A7 horn vibration reducing mix

    Titebond II is good stuff

  3. #13
    Senior Hostboard Member bowtie427ss's Avatar
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    Re: A7 horn vibration reducing mix

    Quote Originally Posted by Elitopus1 View Post
    Titebond II is good stuff
    "titeblonde" in the shop

    Glue suggestions, for wood working NOVICEs ??
    Titebond II as Elitopus suggests is what i use these days as my supply of the original Borden product is now long gone.

    To make a short story long, i live in the little home town of the world famous Elmer's Glue. The Borden Chemical Laboratories were located here in my village until the mid/late 1970's. Titebond II is a licensed version of the original alphatic resin based Elmer's Carpenter's Wood Glue which was developed in the lab here, made in the chemical processing factory at the east edge of the village, and packaged in their packaging facility just outside of the village. The laboratory building and the resin plant are long gone now, the factory building opposite the laboratory property on Johnson Street still stands and is privately owned by a jewlery manufacturer who valued the building for it's huge vault which used to house the master formulas and patent documentation for all of Borden's Chemical products. The 120,000 sq ft packaging facility is now an auction house that specializes in construction/building materials, nothing of Borden's remains here today except chemically contaminated ground water and landfills.
    Not all vegetables make good leaders.

  4. #14
    Senior Hostboard Member Elitopus1's Avatar
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    Re: A7 horn vibration reducing mix

    "titeblonde" in the shop
    +1

  5. #15
    Senior Hostboard Member les winter's Avatar
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    Re: A7 horn vibration reducing mix

    Reporting back on the use of Glop:

    I added an extra rib in the center of each flare, parallel to the two existing ones. After it dried, I used the knuckle test. Better with the rib, but I wanted to go further.

    I glued a few wedges in to the existing ribs where they had developed gaps to the curved plywood section. I found Loctite PL Premium polyurethane construction adhesive to be perfect for the wedges and to secure the additional ribs. Spans gaps, dries hard, holds very well. Wear gloves!

    I mixed the Glop and applied it to the flares 1/4" deep. I treated only the sections adjacent to the new center rib, as the ribs form a dike to hold the Glop.

    It took 2 days to stop being runny, and 5 to dry to a semi-hard condition at 75F and 65% humidity. Maybe it will stiffen further.

    It works. No ringing and a solid thump when the knuckle test is used.

    The Glop is a messy operation and it doesn't dry pretty. As it dries it cracks and looks like the surface of Mars. According to North Creek, this is expected.

  6. #16
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    A7 horn vibration reducing mix


    Phil-G's Avatar
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    Re: A7 horn vibration reducing mix

    Quote Originally Posted by Elitopus1 View Post
    +1
    Nothing like a titeblond to make you forget the ringing.
    Sonic Barbarian

  7. #17
    Senior Hostboard Member Elitopus1's Avatar
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    Re: A7 horn vibration reducing mix

    Quote Originally Posted by Phil-G View Post
    Nothing like a titeblond to make you forget the ringing.

    Ringing, what ringing?

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