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Author Topic: What size logs to successfully achieve 10” x 10” timbers  (Read 1053 times)

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Offline OffGrid973

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What size logs to successfully achieve 10” x 10” timbers
« on: September 30, 2020, 07:23:40 PM »
 

 

 
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Offline moodnacreek

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #1 on: September 30, 2020, 07:30:58 PM »
The diagonal of the square inside bark, small end, straight log.

Offline Den-Den

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #2 on: September 30, 2020, 07:40:45 PM »
A single answer is not valid, you have to take into account how straight the log is and if the end is out of round.
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Online WV Sawmiller

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #3 on: September 30, 2020, 07:43:18 PM »
  This may be the same thing Moody said in a different way but as I understand good straight logs should square up 2/3 of the diameter of the small end, inside bark measurements. In theory a 15" SED log should yield a 10" square but if you need them completely clean without even a trace of bark on any corner I'd move the sizes up a couple of inches. Many of my customers, and certainly for my own use, I don't mind a trace of rounding on the corners. If its for a new customer you want to impress start with an 18" or so SED, straight log to be safe. Good luck.
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Offline Brad_bb

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #4 on: September 30, 2020, 08:32:26 PM »
Is any wane allowed on the corners?  What are you using it for.  If it's a post in a timberframe, or a purlin, I don't mind some wane on two corners sharing a face(the one that sticks out), if it's for interior use.  Exterior use, I don't want any sapwood on the white oak. 
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Offline Ianab

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #5 on: September 30, 2020, 08:48:30 PM »
In "mathematics land" there all cows are perfect spheres and all logs are perfectly round and straight  :D you would need a log 14.14" diameter. Accounting for logs never being perfectly, 15" is a more reasonable minimum. More if logs are noticeably out of round or bent. 

If you don't know if "x" size beam will come from a log, then cut some templates from light ply. If your 10x10 square fits completely inside the small end, then you have a good chance of it working. If the log is to small, or a bit oval and the square doesn't fit, you can see straight away that it's not going to work. That works for any size beam. So if they want a 12x6, see if it fits. 

Also works when the customer wants 10x10s cut from 12" logs, or you want no sapwood left on the beam. 
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Offline OffGrid973

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #6 on: September 30, 2020, 09:49:29 PM »
Only MM I would add another option of 15” if I redid the poll. I do appreciate Brad’s wanynie answer, he used to be a straight shooter before this crew corrupted him with the  “what about” mindset, lol...makes all my posts so worth it so I look forward to the banter.

Wondering if we will end up at 16 or 18 for the final answer, seems many are willing to risk it and stay on the low side for now.

Btw - using to open my barn to the front as I bought a 2nd lawn tractor and want each to now have their own bay to drive in, plus the sliding doors or ends for big lumber and pool poles.
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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #7 on: September 30, 2020, 10:12:18 PM »
   I appreciate the update on Brad. Actually as I understood it he learned everything he knows right here on the FF. :D
Howard Green
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Offline Ron Wenrich

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #8 on: October 01, 2020, 03:06:14 PM »
A calculator from our toolbox.  

https://forestryforum.com/calcs/log_size.htm
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Offline ljohnsaw

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #9 on: October 01, 2020, 05:16:14 PM »
You should also qualify how long a timber.  The longer, the less likely the log is straight and you need to grow the diameter.
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Offline rjwoelk

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #10 on: October 02, 2020, 11:10:26 PM »
If you don't want any sap wood, add 1.5 per  slab per face, or more, then a 2x per face that gets me around 18.  Depends how old the log is, all heavy checking will play into it.
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Offline Dana Stanley

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #11 on: October 03, 2020, 11:04:16 AM »
If the logs weren't real straight and I had one shot to pic a log, I went with 20" so you get a couple good slabs as you work your way to the cant. If I needed several to do for the sake of time and economy, 16-18 would be what I would be looking for. If they were dead straight I suppose the answer is 15, or 14.1 by the calculator!!
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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #12 on: October 03, 2020, 11:23:10 AM »
A quick way to get the diagonal without a calculator is to measure across a framing square worth a tape measure. 8.5" across to 10" , for example, takes a few seconds. Punching that into a calculator takes a lot longer.
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Offline Magicman

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #13 on: October 04, 2020, 08:36:37 PM »
I like to see at least an inch more for wiggle room but with a perfect log the simple way to figure it is "half again bigger".
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Offline Jcsullivan3

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Re: What size logs to successfully achieve 10” x 10” timbers
« Reply #14 on: October 11, 2020, 07:53:06 PM »
I've been cutting a lot of beams lately so I decided to see if there was a common ratio to determine what you're asking.

And....there is!

You can take any log diameter at the narrow end (assuming it's a straight log) and multiply it by .7071 to get the length of one side of the square cant.

If you care to know how it works consistently, it's because if you draw a line from from one corner of the cant to the opposite corner, you've created a triangle. Then the pythagorean theorum comes into play giving you a formula, but to avoid having to do algebra each time, just remember the magic ratio.  .7071

Example: 25" diameter log x .7071 = 17x17 square cant  (always round down to the nearest whole number unless you want exact possible dimensions)
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