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  1. 6th May 2012, 01:42 AM #1
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    antonylord
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    Arrow Large radius rounding over

    Hi all - I'm working on a furniture project and I need to put a large radius (90-100mm) rounding over on one edge of several lengths of 100x100 pine.

    This seems to be out of the realm of regular routing!

    The piece will be getting a final leather skin wrapping so a final look finish isn't vital.

    Anyone got a potential technique for doing this? I was wondering about making some kind of jig for the table saw (think of a multiple pass circle cutter jig but working axially).

    Thanks in advance.
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  3. 6th May 2012, 03:05 AM #2
    yowie
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    A spindle moulder would be ideal, you may be able to get it done commercial somewhere.
    Another option would be to take a few cuts off the radius with the table saw until you are close to the line and then finish by hand.
    The world is a comedy to those that think, a tragedy to those that feel.
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  4. 6th May 2012, 02:59 PM #3
    elanjacobs
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    Quote Originally Posted by yowie View Post
    Another option would be to take a few cuts off the radius with the table saw until you are close to the line and then finish by hand.
    I'd be going with that option.

    Just contemplating a 100mm radius cutter on a spindle moulder makes me scared
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  5. 6th May 2012, 09:17 PM #4
    yowie
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    Yeah dair enough, I may have been a bit hasty with the Spindle Moulder blade. The largest I could find at CMT was R50mm anyway...
    The world is a comedy to those that think, a tragedy to those that feel.
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  6. 7th May 2012, 03:04 AM #5
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    Bundle four of them together with paper joints or countersunk fasteners (deep enough to be out of harm's way). Turn on a lathe. Separate.

    If you don't have a lathe, consider the apparatus I used here: https://www.woodworkforums.com/f8/car...e-horse-57412/

    I think this would also work for the 90mm instead of 100mm.

    Cheers,
    Joe
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    Fiction has to make sense. - Mark Twain
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  7. 7th May 2012, 12:04 PM #6
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    These knives were made after trying a split turning. With split turning the radius was too small. Much larger timber needed to get the required radius.

    as mentioned above get it close with your saw bench or jointer and finish off with a plane.
    Cheers, Bill
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  8. 7th May 2012, 07:52 PM #7
    elanjacobs
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    What's the radius of those knives?
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  9. 8th May 2012, 07:49 AM #8
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    Quote Originally Posted by elanjacobs View Post
    What's the radius of those knives?

    The knives are a 43 mm radius and what they call BFCs. Big Fecken Cutters.
    Cheers, Bill
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  10. 8th May 2012, 07:44 PM #9
    elanjacobs
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    Quote Originally Posted by Ball Peen View Post
    The knives are a 43 mm radius and what they call BFCs. Big Fecken Cutters.
    Those aren't big. We've got some knives for slotted collars that are 92mm high with about 40mm projection - now THAT'S big
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  11. 8th May 2012, 09:20 PM #10
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    Quote Originally Posted by elanjacobs View Post
    Those aren't big. We've got some knives for slotted collars that are 92mm high with about 40mm projection - now THAT'S big
    " That's not a knife.......this is a knife ! " Any photos ?

    The ones in the photo are 85 mm x 37 mm projection and sound like low flying aircraft. I have a 100 mm cormice knives. All my knives are serrated for a 100 mm safety head. The work is dangerous enough without using BFCs in slip collars. It's tooling from the dawn of time. Better you than me.
    Cheers, Bill
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  12. 8th May 2012, 09:29 PM #11
    elanjacobs
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    I'll try and remember to get some pics tomorrow. The collars we use have a pin in them for a bit more safety. We've got well over 100 profiles, might even be closer to 200, so getting them all re-made on serrated knives would cost a fortune.

    As far as I know we haven't had a knife come out in 100 years of the company - I guess it only takes one idiot somewhere who doesn't tighten something to spoil it for everyone else
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