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Thread: Solid horn - work in progress

  1. #1
    Supporting Member rendoman's Avatar
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    rendoman's Tools

    Solid horn - work in progress

    Hi all!
    I'm building the second horn for my RCF Nd1710 mt3 audio driver, 1" exit , 108db/w/m, 1-20khz range, titanium diaphragm and strong magnet.

    The big boy is a 130mm round bar, normal aluminum that melt on tools

    I chose tractrix contour, I tried it many times in the past, it works perfectly for home use for middle and high frequency.


    Probably I will buy a good finishing tool


    Some pictures of the horn , still work in progress

    Saluti
    Stefano

    Solid horn  -  work in progress-43030776_10217080616270270_7333550902940270592_o.jpg Solid horn  -  work in progress-42881923_10217080616870285_8498871789152108544_o.jpg Solid horn  -  work in progress-42917401_10217080619110341_3632214199679057920_o.jpg

    Solid horn  -  work in progress-42887320_10217080625790508_6704076394344742912_o.jpg Solid horn  -  work in progress-42894421_10217080625510501_5189610336671498240_n.jpg Solid horn  -  work in progress-42996794_10217090690482119_8964229150621564928_o.jpg

    Solid horn  -  work in progress-dsc04604_1600x1200.jpg Solid horn  -  work in progress-dsc04607_1600x1200.jpg Solid horn  -  work in progress-dsc04609_1600x1200.jpg

    Solid horn  -  work in progress-dsc04611_1600x1200.jpg

  2. The Following 3 Users Say Thank You to rendoman For This Useful Post:

    PJs (10-04-2018), Seedtick (10-03-2018), Tuomas (10-05-2018)

  3. #2
    Supporting Member rendoman's Avatar
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    rendoman's Tools
    Aluminum streamers today!

    The raw profile of the horn is done, with the lathe at limit. My endowment of boring bar is limited, for this tool I have no new carbide tips. Unluckily the only right tool I have, it's short and tiny, not enough for this job but I do what I can.
    Now it's time to use the files, lot of sand paper and finally wool and polish!

    I'm having some trouble about vibration using boring tool and up to 20° angle, have some good advice in order to have a good smooth surface?
    thanks
    Stefano

    Solid horn  -  work in progress-dsc04618_1600x1200.jpg Click image for larger version. 

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ID:	25942 Solid horn  -  work in progress-dsc04621_1600x1200.jpg

    Solid horn  -  work in progress-dsc04622_1600x1200.jpg Solid horn  -  work in progress-dsc04624_1600x1200.jpg Solid horn  -  work in progress-dsc04626_1600x1200.jpg

    Solid horn  -  work in progress-dsc04627_1600x1200.jpg

  4. The Following User Says Thank You to rendoman For This Useful Post:

    Tuomas (10-05-2018)

  5. #3
    Supporting Member Tuomas's Avatar
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    Tuomas's Tools
    Wow. Nice.

  6. The Following User Says Thank You to Tuomas For This Useful Post:

    rendoman (10-06-2018)

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    Supporting Member rendoman's Avatar
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    rendoman's Tools
    Thank you Tuomas!

  8. #5
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    It is a crying shame that the true acoustics of your builds can never be experienced coming from the speakers or headphones of our computers.
    I liken these to that of trying to experience the effects of a performance in a symphony hall from an ear bud on a 2 transistor am radio.
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  9. The Following User Says Thank You to Frank S For This Useful Post:

    rendoman (10-07-2018)

  10. #6
    Supporting Member rendoman's Avatar
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    rendoman's Tools
    You're right Frank! I hope I will be able to describe the sensations!
    The good thing is that with only one watt you can have 108db at 1 meter, so even a tiny amplifier with no caps and few components can make the difference

    Ps: I'm close to sand paper work!

    Solid horn  -  work in progress-dsc04628_1600x1200.jpg Solid horn  -  work in progress-dsc04629_1600x1200.jpg

  11. #7
    Supporting Member rendoman's Avatar
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    rendoman's Tools
    Ready to polish the inside of horn… unluckily I can't use cotton wheels and normal paste.
    I'm trying to make a "grease" paste with powder, I hope it will be good!

    Solid horn  -  work in progress-dsc04695_1600x1200.jpg Solid horn  -  work in progress-dsc04696_1600x1200.jpg Solid horn  -  work in progress-dsc04697_1600x1200.jpg

  12. #8
    Supporting Member Frank S's Avatar
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    Frank S's Tools
    If you can't find any jewelers rouge then a wad of lambs wool on a stick and tooth paste usually works for me.
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  13. #9
    Supporting Member rendoman's Avatar
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    rendoman's Tools
    Some work of adjustment, lot of sand paper needed, lot of passion.
    I prepare a second special recipe for the polishing paste with lithium grease and oil, it should work fine, at least it can stick better to surface. The trouble is that I can't push so much to increase heat, like with cotton wheels. Another trouble this soft aluminum is a crap to polish compared to ergal, scratch are behind every corner.
    I'm thinking about the next step, Last time I build brass long feet from solid bar (H frame), maybe I will machine a couple of rods fixed directly to the horn.

    Solid horn  -  work in progress-dsc04700_1600x1200.jpg Solid horn  -  work in progress-dsc04701_1600x1200.jpg Solid horn  -  work in progress-dsc04703_1600x1200.jpg

    Solid horn  -  work in progress-dsc04704_1600x1200.jpg Solid horn  -  work in progress-dsc04705_1600x1200.jpg

  14. #10
    Supporting Member rendoman's Avatar
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    rendoman's Tools
    Hi all!
    Lot of time with sandpaper, from 60 to 1500 grit, about 5 hours to polish both, I still need half an hour, the abrasive mix with grease and oil is hard to clean inside the horn, in first picture there is the veil on the surface.
    I have to finish the adaptor, and thinking about the pedestal, I found 25mm solid brass round bar that seems perfect for the purpose, I'm still undecided if make a stand alone unit or fix to the horn through screws.

    Solid horn  -  work in progress-dsc04720_1600x1200.jpg Solid horn  -  work in progress-dsc04707_1600x1200.jpg Solid horn  -  work in progress-dsc04708_1600x1200.jpg

    Solid horn  -  work in progress-dsc04709_1600x1200.jpg Solid horn  -  work in progress-dsc04710_1600x1200.jpg Solid horn  -  work in progress-dsc04712_1600x1200.jpg

    Solid horn  -  work in progress-dsc04715_1600x1200.jpg Solid horn  -  work in progress-dsc04716_1600x1200.jpg

  15. The Following User Says Thank You to rendoman For This Useful Post:

    Tuomas (10-14-2018)

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