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Author Topic: Cutting a curve in the underside of a knee brace  (Read 8813 times)

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Offline bbjr

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Cutting a curve in the underside of a knee brace
« on: December 31, 2010, 12:23:11 PM »
Hey guys, I am putting the finishing touches on my home (conventional framing :'(, hey it's what's familiar to me  :D)), and I am trying to add some details to make it look like a timber frame. 

I just finished milling up about 3000bdft of salvaged oak barn timbers on my Woodmizer, and I am getting ready to start planing and sanding.  What I am wondering about, is what method you guys use to saw the curved underside of a knee brace?  I bashfully admit, I haven't read as many back posts in this subforum as I have in the milling subforum, but I read though the stickies and ran some searches using the terms curve, arch, and knee brace, and haven't found an answer.

I am hoping to accomplish this using conventional framing tools, but I can't see how using a circular saw would work without binding, and I don't think a jig saw would be powerful enough.  Any ideas?  Thanks.

Offline witterbound

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Re: Cutting a curve in the underside of a knee brace
« Reply #1 on: December 31, 2010, 01:47:28 PM »
Band saw.

Offline northwoods1

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Re: Cutting a curve in the underside of a knee brace
« Reply #2 on: December 31, 2010, 02:35:48 PM »
Band saw.

Yes, and another thing is a ....chainsaw. You can cut to a mark quite accurately and finish it up with hand tools. I did the same thing in my house.

Offline Rooster

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Re: Cutting a curve in the underside of a knee brace
« Reply #3 on: December 31, 2010, 04:14:59 PM »
I found this link on the Guild forum.

http://www.tfguild.org/forums/ubbthreads.php?ubb=showflat&Number=15208&Searchpage=3&Main=2860&Words=curve&Search=true#Post15208

TF Guild forum member Joe Wood posted this on 4/22/08

I hope it helps.


Rooster
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       and new barns are a reminder that I am not so young."
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Offline Jim_Rogers

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Re: Cutting a curve in the underside of a knee brace
« Reply #4 on: December 31, 2010, 04:53:46 PM »
We use curved stock to start with see post I just bumped to move it to the top....
Whatever you do, have fun doing it!
Woodmizer 1994 LT30HDG24 with 6' Bed Extension

Offline bbjr

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Re: Cutting a curve in the underside of a knee brace
« Reply #5 on: January 01, 2011, 11:57:30 AM »
It looks like I may be adding a new tool to my arsenal, then  :D

Thanks for the link to the thread, Jim.  I do not have any curved stock to use, but your method makes sense as far as grain the grain coming out and creating a weak spot.  Although, since these braces are often used to prevent racking, and not to support the downward force of a tie or beam, is it critical to keep the grain from coming out the bottom side?

Rooster, I tried going to your link, but none of the pics were showing up for me and I did not see any mention of knee braces in the literature.  Not sure if my pc is redirecting me to a different page, or not?  Thanks anyways, though.


Offline Jim_Rogers

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Re: Cutting a curve in the underside of a knee brace
« Reply #6 on: January 01, 2011, 12:30:47 PM »
Are you just accenting a normally straight brace? If so, I would axe close to the line and clean up with an adze and a spoke shave. For very curved pieces, you will want to use a naturally curved piece so that you don't have grain run-out.

If you are going to cut a curve into a piece of brace stock such as with a band saw, yes you may get some grain run-out where the curve is. However you usually start with a very large piece so that there is plenty of wood that is straight grained from the tenon to tenon and doesn't run-out. These long grain lines will hold the compression when the brace is working.
Whatever you do, have fun doing it!
Woodmizer 1994 LT30HDG24 with 6' Bed Extension

Offline bbjr

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Re: Cutting a curve in the underside of a knee brace
« Reply #7 on: January 01, 2011, 04:47:31 PM »
Thanks, Rooster, the link is working now.  Looks like a clever way of getting it done with a bandsaw.

Offline jander3

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Re: Cutting a curve in the underside of a knee brace
« Reply #8 on: January 01, 2011, 06:22:11 PM »
I use a small chainsaw (i.e) 35 cc.  If you use the backside of the bar it is a pretty easy cut.   I find the backside of the bar is a little easier to cut a curve with.

Offline Dave Shepard

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Re: Cutting a curve in the underside of a knee brace
« Reply #9 on: January 01, 2011, 07:42:08 PM »
Jim, I think that post you quoted was supposed to be in this thread. :D I was thinking of really curved stuff, like the geometric design frame from last fall.

Wood-Mizer LT40HDD51-WR Wireless, Kubota L48, Honda Rincon 650, TJ208 G-S, and a 60"LogRite!

Offline Piston

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Re: Cutting a curve in the underside of a knee brace
« Reply #10 on: January 01, 2011, 07:58:19 PM »
So THAT'S where you avatar came from Dave!
-Matt
What the Lion is to the Cat the Mastiff is to the Dog, the noblest of the family; he stands alone, and all others sink before him. His courage does not exceed his temper and generosity, and in attachment he equals the kindest of his race.

Offline Dave Shepard

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Re: Cutting a curve in the underside of a knee brace
« Reply #11 on: January 01, 2011, 10:24:19 PM »
This is the building we built during the Geometry workshop in Oct./Nov. 2009. All of the members of the frame are located using the daisy wheel. We had a 1/12th scale drawing, and we had to use dividers and get the dimension from the plan, then step it off on the timbers to get the correct length. This is a combination hewn/sawn frame. The rafters, collars, posts, and anchorbeams I sawed on the mill. The braces, plates and joists we hewed under that tent. At one point there was something like 17 people all hewing and chopping at once. 8) This building was auctioned at the Timber Framers Guild 2009 Eastern Conference, is now in Texas.
Wood-Mizer LT40HDD51-WR Wireless, Kubota L48, Honda Rincon 650, TJ208 G-S, and a 60"LogRite!

Offline apratti

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Re: Cutting a curve in the underside of a knee brace
« Reply #12 on: September 19, 2021, 01:56:40 AM »
Hi. Is there a special way to design the curve for knee braces? I look at them and wonder how they're so uniform and even. They look so cool, but I can't imagine it being easy. Do I start with extra-wide and stuff, like 4x8 and reduce it to what looks like 4x4 in the middle?

A lot of wasted wood from this design? Band saw too?
Anyone have a video?
Thank You, Amalio Pratti
 

Offline Chilterns

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Re: Cutting a curve in the underside of a knee brace
« Reply #13 on: September 19, 2021, 08:12:52 AM »
The correct way to make curved braces is to select a section of tree trunk approx 9-10" diameter featuring the required profile (single curve or ogee). Half this along the centre line using a band saw then lay down the flat side on the bed and re saw to the required thickness - generally 3" for 1.5" bare faced tenons. This will leave 2 edges i.e. the inner and outer showing wane over the whole face. Lay this flat and score with an axe and then hew off the chips. It's worth running a draw knife over the finished edges to produce a nice flat face for scribing. This takes about 5 minutes.

We have just finished making and fitting 4 such braces from larch and this can be seen at :-

Oxfordshire Woodland Group on Twitter: "A change in atmospherics (dull day) has enabled the production of better pics of the cross braces & frame #1.? "

Regards

Chilterns

Offline Jim_Rogers

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Re: Cutting a curve in the underside of a knee brace
« Reply #14 on: September 19, 2021, 08:46:02 AM »
Whatever you do, have fun doing it!
Woodmizer 1994 LT30HDG24 with 6' Bed Extension


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