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Thread: Cove line, how-to ?

  1. #1
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    Default Cove line, how-to ?

    Hi all,

    Any suggestion as to how to make a cove line below the sheer on a sailboat hull ?

    Sticker ? Router ?

    If routing, how to do it accurately (other than free hand) ?

    image.jpg
    What about the arrow-head ?
    Thanks in advance,
    Best regards,
    Gilles

    http://lapierre.skunkworks.free.fr
    http://contrails.free.fr

    Fools build boats for wise men to sail

  2. #2
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    Default Re: Cove line, how-to ?

    For the long part, tack on a fair batten to guide your router. For fancy stuff there's a gizmo, really a pair of collets, that fit on the router to allow you to follow a perfect inside or outside form. It's used a lot in counter top businesses.

  3. #3
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    Default Re: Cove line, how-to ?

    Or you can carve with a gouge.

    Or... what I do. You can do the long bit as Ian suggests, including the dot if you've got a steady hand. Then finish it off by carving.
    David G
    Harbor Woodworks
    https://www.facebook.com/HarborWoodworks/

    "It was a Sunday morning and Goddard gave thanks that there were still places where one could worship in temples not made by human hands." -- L. F. Herreshoff (The Compleat Cruiser)

  4. #4
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    Default Re: Cove line, how-to ?

    If you hand carve the end bits you can do something more unique. And it won't look machine made. A couple of quick ideas:

    IMG_3399.jpg

    Jeff

  5. #5
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    Default Re: Cove line, how-to ?

    Routers are scary for such work. I like tacking a batten under the proposed line and using a cove plane of the desired arc, like 1/2" round. The end details can then be done with the appropriate gouge.

  6. #6
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    Default Re: Cove line, how-to ?

    Quote Originally Posted by Thad View Post
    Routers are scary for such work. I like tacking a batten under the proposed line and using a cove plane of the desired arc, like 1/2" round. The end details can then be done with the appropriate gouge.
    I did that, and screwed a plate brass fence to the side of it on an appropriate spacer. In my case to follow the seam below the sheer strake. An open seam, not caulked obviously.
    DSC03804.jpg
    It really is quite difficult to build an ugly wooden boat.

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  7. #7
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    Default Re: Cove line, how-to ?

    I think a batten tacked to the hull would be pretty simple to follow with a trim router and a core bit for the long run. I'd be tempted to sand the guiding edge and hit it with some gloss spray paint to make it slippery. I like the idea of customizing the pointy ends with gouges.

  8. #8
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    Default Re: Cove line, how-to ?

    When you tack your guide batten on the hull, an alignment jig is helpful in the form of a block with of brad poking out at the right distance for the router body. This can be a series of brad pricks. The main thing is to have a fair batten line. Sighting it a lot with a helper will help to get it adjusted.
    The traditional ending is a long arrow head such as in post #4. I like the arc bracketing the dot in the second example of #4. Stripping gold comes in various widths so you should make a cove that allows for it to match with minimum waste of the gold! Normally incised work needs no top coating as the cove protects the gold. Here is she source of rolled gold that I deal with. http://artessentialsofnewyork.com/
    Jay

  9. #9
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    Default Re: Cove line, how-to ?

    Thanks to all who reponded.

    Understand the necessity of a long smooth batten for the tool to glide along.
    Great idea using a cove plane instead of a brutal router. Noticed another thread on WB forum where the builder shows his mold and cove planes with blades made out of a cheap chisel.

    I'm not too confident in my skills with a gouge (so much for my "no free hand" idea ;-), so the arrow head seems to me the most difficult to achieve...

    Thanks for the idea of the gold finish, I was wondering what contrasting color I should use.
    Best regards,
    Gilles

    http://lapierre.skunkworks.free.fr
    http://contrails.free.fr

    Fools build boats for wise men to sail

  10. #10
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    Default Re: Cove line, how-to ?

    Quote Originally Posted by aiprt View Post
    Great idea using a cove plane instead of a brutal router. Noticed another thread on WB forum where the builder shows his mold and cove planes with blades made out of a cheap chisel.
    I ground an old file to make the cutter in the one I posted.
    It really is quite difficult to build an ugly wooden boat.

    The power of the web: Anyone can post anything on the web
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  11. #11
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    Dec 2013
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    Default Re: Cove line, how-to ?

    And guess what, my faithful Tormek is perfectly suited to ground my cove blade...

    Now the boat is still to be built, so maybe I'll have time to learn how to carve an arrow head...

    Thanks to everyone
    Best regards,
    Gilles

    http://lapierre.skunkworks.free.fr
    http://contrails.free.fr

    Fools build boats for wise men to sail

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