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Author Topic: Split a beam on diagonal!??  (Read 989 times)

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Offline quadracutter222

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Split a beam on diagonal!??
« on: November 01, 2019, 01:38:36 AM »
Hello and happy Halloween!

Had a customer ask if I could saw 8x8s on the diagonal to produce two right angle three sided beams. Naturally being a new naive sawer said yes.

Any one done this before?  Thinking of some sort of jig that fits the bunks.


Online doc henderson

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Re: Split a beam on diagonal!??
« Reply #1 on: November 01, 2019, 01:47:27 AM »
Happy Halloween back at ya.  I have never done a triangle profile, and to be sure I understand, is it an 8 x 8 x 8.  with 3  60 outside angle.
or are we splitting an 8 x 8 beam in half on the diagonal which would be easier. so a 90 and two 45s? i.e. 8 x 8 x 11.3.
if you do this will you have to change you handle to tri cutter?  :) :) :) @quadracutter222
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Re: Split a beam on diagonal!??
« Reply #2 on: November 01, 2019, 02:06:51 AM »
If you are sawing 8 x8 square beams on the diagonal, you just need a jig made from two 2 x 8s at a 90 degree angle to hold the beam.  maybe then a notch at 90 in a brace/leg to hold it so it looks like a "V".  adjust your height, and saw away.  this is what I thought you were asking based on your question.  how long will they be.  if very long, and if twisted, may not come out perfect along the edge.  would to be good to know what the customer plans to do with them, and be sure to limit expectations.  what kind of wood?
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

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Re: Split a beam on diagonal!??
« Reply #3 on: November 01, 2019, 02:19:38 AM »
so a or b?




 

also how many?  the more you will do, the more effort I would put into the jig.  
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline Nebraska

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Re: Split a beam on diagonal!??
« Reply #4 on: November 01, 2019, 07:17:08 AM »
That would make a different look  for a celing.  I can't recall ever seeing one if that is where it ends up.

Online Don P

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Re: Split a beam on diagonal!??
« Reply #5 on: November 01, 2019, 07:50:37 AM »
That would not be much of a beam structurally and would more than likely produce two bananas. Make sure you are not on the hook for the results.
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Offline moodnacreek

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Re: Split a beam on diagonal!??
« Reply #6 on: November 01, 2019, 08:24:48 AM »
If it can be done it is done. A mill near me used to cut triangles for a customer to buck into wedges. Apple bin [boxes] have corner boards in the bottom cut made from diagonally split 3x3. Some people call this product skewback. Somebody put a traveling bandsaw over a log lathe and ran both at once to make spiral posts.    And then there where stone boats made with no iron front, the planks being sawn curved up in the front.

Offline Magicman

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Re: Split a beam on diagonal!??
« Reply #7 on: November 01, 2019, 08:29:47 AM »
would more than likely produce two bananas
Yup, sorta like when I was asked to saw a 12X12 Poplar into four 6X6's.  I said no, he said yes, I said you ain't gonna like it, he said do it, I did, and he didn't like it.
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Offline Weekend_Sawyer

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Re: Split a beam on diagonal!??
« Reply #8 on: November 01, 2019, 08:33:31 AM »
Huh, I was sure I replied to this post just now.

and here's what I said.

Doc, reading his post I believe your drawing A is what he's going after.

I agree with DonP it will likely bow.

If this is a paying job I would explain the risk and charge by the hour.
I would make a jig by cutting some 1' 2x4's on a 45 and attaching them on edge to another 2' long 2x4. You can toenail the 8x8 to the jig but it would probably hold itself down.

Good luck and please update this thread with your results
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Offline Percy

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Re: Split a beam on diagonal!??
« Reply #9 on: November 01, 2019, 09:35:36 AM »
would more than likely produce two bananas
Yup, sorta like when I was asked to saw a 12X12 Poplar into four 6X6's.  I said no, he said yes, I said you ain't gonna like it, he said do it, I did, and he didn't like it.
Hahahaha...I love your way of putting things....... ;D
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Re: Split a beam on diagonal!??
« Reply #10 on: November 01, 2019, 09:40:45 AM »
   I agree with Doc's a. drawing. That's how I'd do it. It doesn't look like it should be that hard to do. Sort of like RRQS. I also agree with the MM you should warn the customer first but then i would do it if he still wanted.
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Offline dutchman

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Re: Split a beam on diagonal!??
« Reply #11 on: November 01, 2019, 09:41:50 AM »
Ive split hundreds of beam on the diagonal for local pallet shop.
Made several different jigs.
Used a wide full size 2x as a clamping board.
Cut the triangle pieces on table saw.
Mount the triangle on clamping board, screwed from underneath.
Mounted metal truss joint pieces on the triangle to hold against
The blade pressure.
The cant will move but I never had one come off.
Must set the cant on the metal holders, dropping will cause the fingers
To collapse.
Longest I cut was 8.
They were used to hold steel coils, didnt need to be pretty.

Offline Woodpecker52

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Re: Split a beam on diagonal!??
« Reply #12 on: November 01, 2019, 09:51:48 AM »
Would not want to bump my head on that beam :D
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Offline quadracutter222

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Re: Split a beam on diagonal!??
« Reply #13 on: November 01, 2019, 10:02:04 AM »
Thanks for the responses!  

I am looking to do sketch 'A' in doc's drawing.  The customer is planning on using them for top plates on top of ICF forms for a 12/12 roof made of engineered I-beams (cannot let in birds mouth)

He wants a total of 40', but I am thinking of doing it in 8's would yield the best results.  

Perhaps two/three braces that slip over the bunks?  Or the X supports screwed to a wide slab or plywood then clamped?  Hmmm, anyone have any pictures?

Offline blderman

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Re: Split a beam on diagonal!??
« Reply #14 on: November 01, 2019, 10:15:22 AM »

I had to do the same thing on a house I built last year.  I wish I would have had my sawmill at the time as I had to cut all the bevel plate using a 16" beam saw and then finish what it couldn't reach with a sawzall.  It was painstakingly slow and difficult to get an accurate cut.



Offline Jim_Rogers

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Re: Split a beam on diagonal!??
« Reply #15 on: November 01, 2019, 10:18:14 AM »
When I did it I just put the wedge on the mill bed:





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Re: Split a beam on diagonal!??
« Reply #16 on: November 01, 2019, 10:20:31 AM »
I do not have pics as I have not done this identical thing, but a made a flag pole out of cedar making a tapering octagon.  would need pics and or detail of your mill, to help with finite details, but for as little as you are making, make the jig to hold the 8 x 8, and then add support over the bunks.  If you are not going to do this 5 days a week then just screw stuff together and give it a try.  the application does not sound like it requires perfection unless it will be seen and the look is a big deal.  If this is timber frame then I have seen others cut the whole top plates to this shape, and not just a cap.  so this is a filler cap.  Is the top plate really 8 inches wide?  what wood species?  you will spend as much time fitting the jig, as sawing.  sounds like fun and a challenge.  please follow up with pictures and lessons learned.  for length I think you could go longer and or plan the joints to stagger and miss the rafters.  good luck!
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline GAB

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Re: Split a beam on diagonal!??
« Reply #17 on: November 01, 2019, 11:37:19 AM »
Get two pieces of 2"x6"x 10" long, clamp them together and cut as deep V as possible in them.
Then put one on each end bed rail, place 8x8 in them, then clamp and saw.
That is how I saw the 5th and 6th sides of an octagonal post.
Jim Rogers is close to what I do.
Gerald
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Re: Split a beam on diagonal!??
« Reply #18 on: November 01, 2019, 09:15:07 PM »
Rather than a beam, that is called a cant strip.

The customer can be right if you want the work but I'd rip a 45 on each edge of a 2x8, measure top width, then a 45 on each edge of a 2x6 to the previous top width, stack em on the wall and bolt down. That should yield more than the required bearing area.

Even with solid sawn you really don't want a birdsmouth up top to avoid splitting the rafter.
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Offline Larry

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Re: Split a beam on diagonal!??
« Reply #19 on: November 01, 2019, 09:50:56 PM »
I sawed a few hundred for a guy.  He was chopping them into 10" long blocks, sticking in an eye bolt, and selling them as chock blocks.  I sawed doc's A pattern.  If you don't know what a chock block check this out. 

Rubber Wheel Chock with Eyebolt

I just made a plywood form to hold the cant and split the thing.  No pictures but sawing octagon posts is similar.





Sawing this kind of stuff is pretty routine.  Sawing tapered sections is what separates the men from the boys. ;D >:( ;D
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