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  1. #1
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    Default How to create accurate round ends

    Folks,
    Can somebody please enlighten me as to how to create accurate rounded ends on a length of timber as per the attached drawing.
    I would like it to be as accurate a curve as possible, but short of roughing it out, and then sanding to a line, I can't see another way of achieving this, and it won't be as accurate as I would like.

    I am talking about relatively small stock here, around the 20mm square and want the diameter of the curve to be equal to the width of the stock

    Thanks

    Ian

    rounded end.jpg

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  3. #2
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    Default

    Hi,
    I would suggest making a pattern and using a pattern following bit in a router.
    Regards
    Hugh

    Enough is enough, more than enough is too much.

  4. #3
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    Hugh,
    Thanks for the quick response.
    I had thought of that, but given it's all end grain, I reckon breakout will be a real problem.
    Still, if all else fails...

    Ian

  5. #4
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    Default

    Bandsaw and a disc sander would make light work of it.

  6. #5
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    Default

    Hugh,
    It would, but I was hoping for a bit more accuracy.

    Ian

  7. #6
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    Default

    Are you talking multiples?

    If so a jig is the way to go. I would have a jig with a pivot pin that you can work on using a disc sander. At 20mm square it would not particularly matter if you roughed it first though it would speed the process up even if you just knocked the corners off

    Just drop each piece onto your jig and swing away


    Dave the turning cowboy

    turning wood into art

  8. #7
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    Default

    If talking multiples, use thicker stock, round off and dimension the thickness with a table saw. You then have multiple pieces with exactly the same ends.
    CHRIS

  9. #8
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    back in Alberta for a while
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    Default

    Quote Originally Posted by Ian Smith View Post
    Folks,
    Can somebody please enlighten me as to how to create accurate rounded ends on a length of timber as per the attached drawing.
    I would like it to be as accurate a curve as possible, but short of roughing it out, and then sanding to a line, I can't see another way of achieving this, and it won't be as accurate as I would like.

    I am talking about relatively small stock here, around the 20mm square and want the diameter of the curve to be equal to the width of the stock

    Thanks

    Ian

    rounded end.jpg
    Hi Ian

    how accurate does the rounding over need to be?

    disk sander and sanding to a line is probably the easiest.

    A router and template will also work -- I suggest a spiral bit and cutting from both sides after first roughing out with a band or jig saw.

    A bull nose bit might work, but at $71 for a 19mm 1/2 in shank cutter from carbatech is possibly too steep.
    regards from Alberta, Canada

    ian

  10. #9
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    This would be how I would do it, much like Dave said
    IMG_0611 (500x375).jpgIMG_0613 (500x375).jpgIMG_0612 (500x375).jpg
    There's two pivoting jigs here, the larger radius jig allows the jig to be rotated to allow loading/unloading of the carrier/workpiece, note the handle in the slot acting as a stop.
    The small radius pivot (in this pic set at about45mm) you would set at 10mm, this pivot carries the jig that holds the workpiece.



    Pete

  11. #10
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    Chris, Ian,

    I think a combination of your two suggestions regarding thicker stock and a bull nose router biter bit (I have one of those of the appropriate radius) will do the trick, so thank you.


    Pete,
    I had thought of your suggestion, but the thing that makes it unsuitable for me, unless I am misinterpreting your pictures, is that you cannot create a round end with the same diameter as the width of the stock. Call me fussy, but that's what I wanted.


    Thanks to all who responded

    Ian

  12. #11
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    Ian

    Pete's picture is very close to what I had in mind. As it is such a small radius I knew it would be a more fiddly jig.

    With a flat board for it to sit on and a fence it could swing flat on one side against the sanding disc and swing to just over 1/2 way. Then flip the piece and do the other side.

    Unless you back feed I see splitting as a significant risk using a router


    Dave the turning cowboy

    turning wood into art

  13. #12
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    II can sketch it if you think it is something you might be interested inbut if you are happy with your current approach that is cool.

    How many do you have to do?


    Dave the turning cowboy

    turning wood into art

  14. #13
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    Dave,
    I have about up to about 20 to do, so a small run, but I would like to get them all looking good and identical.
    I guess I am getting a bit obsessive over this, but it does bug me that something apparently so simple is, in fact, quite complex to achieve.

    I would be interested in your suggestion if you are inclined to take the time to draw it up


    Thank you

    Ian

  15. #14
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    Default

    are they all the same length?

    I'll try and have something drawn up by tonight


    Dave the turning cowboy

    turning wood into art

  16. #15
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    Default

    Dave,

    Yes, they are all the same length.

    Ian

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