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Author Topic: Douglas Fir - One Tree project
Ken Hume
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Posts: 641
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Post Douglas Fir - One Tree project
on: May 17, 2021, 15:04
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Storms tore off the top 30 ft of this nice 100 ft Douglas Fir Tree.

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This tree will now be felled and converted into planks and beams using a mobile saw.

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We eventually took down the 65 ft (85 cu ft) snag Douglas Fir tree.

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We measured this and found that this will yield sufficient structural timbers needed to make a small home office or large garden shed timber-frame.

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The trunk should be able to be quartered to make beams.

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We then designed a timber frame that we will build.

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Would you like one (or two or three) ?

Ken Hume
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Posts: 641
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Post Re: Douglas Fir - One Tree project
on: May 17, 2021, 15:31
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The DF logs were pulled out of the woodland to the track using the Land Rover (low box selected). This is what a 100 ft tree can produce. Now for conversion.

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Logs 3, 4 & 5 were loaded onto the trailer destined for the saw to be converted into cross sills, tie beams & internal posts. Logs 4 & 5 are longer than the trailer bed and so the tailgate was secured above the ground using a come-a-long. We need a bigger trailer !

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Logs 3-11 are now at the barn.

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Logs 1 & 2 are much heavier and will need a tractor with a front end loader or possibly a forwarder to move.

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These logs have been bucked from just one 97ft Douglas fir tree and are destined to make a small home office timber-frame. Hey Dougie !

Ken Hume
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Posts: 641
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Post Re: Douglas Fir - One Tree project
on: May 17, 2021, 15:44
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Logs 6 & 7 were put through the saw and yielded 2 off 8" x 8" x 8ft posts ready for incorpration into a local building. Local produce for local projects.

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addendum - Jul 2021
Nick Dunthorne completed his Berkshire home office building incorporating the two Douglas Fir posts (seen on the extreme left).

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This building demonstrates that timber buildings can be truly beautiful.

Log 3 was quarter sawn to produce 4 off 6" x 6" x 7ft sidewall & door posts for the local home garden office.

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Log 4 is 12" longer than the saw head can travel and so the last 12" had to be rip sawn using a 2 man (cross cut) saw. Not ideal. This log will be used to make 2 off x 7" x 7" x 11ft cross sills for the local home garden office. We need a longer sawbed !

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Log 4 is 12" longer than the saw head travel and so the last 12" had to be rip sawn using a 2 man (cross cut) saw. Not ideal. This log will be used to make 2 off x 7" x 7" x 11ft cross sills for a local home garden office. We need a longer sawbed !

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OWG Fellow Andrew Jarvis fitted a 6ft extension to the sawmill bed but the end of this stuck outside the barn. We need a bigger barn !

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Following the fitting of the sawbed extension we converted log 5 to form 2 matching tie beams. Each end of the tie beams will be taper profiled.

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Ken Hume
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Posts: 641
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Post Re: Douglas Fir - One Tree project
on: May 17, 2021, 15:57
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It's time to pull the 2 big logs up to the barn. The 14 ft DF 2nd log weighs 831 lbs and it's quite a squeeze to get it on board the trailer. We need a much bigger logging trailer !

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A Masdam come-a-long is used to hold up the trailer gate whilst being towed by the Land Rover.

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Offloading the logs is somewhat easier. Tie the log to a convenient tree and pull the trailer away !
Use small poles as rollers and keep the log off the ground.

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The tools needed to manually move big logs are quite simple and low cost but time consuming

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Ken Hume
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Posts: 641
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Post Re: Douglas Fir - One Tree project
on: May 17, 2021, 16:16
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Log 2 was squared up on the saw to make a 14" x 14" beam.

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This was then quartered to produce 4 off waney edged 7" x 7" x 14 ft long wall plates(2 off) and long sills (2 off).

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Log 1 was two side slabbed to form a 14 " thick billet that was then halved to make 7" thick stock to be halved again to make 4 matching corner jowl posts. The jowl is the flare at the butt end of the log and it is used to make the tying joint between post, wall plate & tie beam.

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The sawmill has a throat size of 7" which limits sawing the 2 x post slab all the way along it's length.

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The slab was taken off the mill and then rip sawn using a Japanese pull saw.

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The 2nd jowl posts slab was sawn on the mill to form 2 x 7" x 7" posts with 10" wide jowls.

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These were then rip sawn using a medieval style frame saw to make 2 x jowl posts.

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We need a bigger saw or bigger muscles !

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Ken Hume
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Posts: 641
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Post Re: Douglas Fir - One Tree project
on: May 17, 2021, 16:37
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The cruck barn is now full of timbers cut for the one Tree - Home Office project and some fence posts for The Sonning Green Gym. We NEED a timber storage / drying shed.

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The One Tree - Home Office timbers have been moved outside the barn and stacked on pallets (courtesy Berkeley St Joseph Homes). This will help provide better air flow through stacked timber. The stack needs to be covered with corrugated iron sheets. We need more sheets !

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Just before Lockdown III we managed to recover a load of good western red cedar logs from piles stacked in the woodland by Hattie the horse logger for conversion into 4" x 4" rafters. These logs have been in stack since 2016 and are perfect (no rot).

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Drawdown of the logs has commenced with the first 4 logs being the least likely to produce the best 4 x 4 section along the full length of the scantling. WRC is quite soft and so the current blade needs to be replaced with a new "Ripper" blade to ensure a smooth surface finish.

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A new "Ripper" blade has been fitted to the mobile saw and work has proceeded apace to make 14off - 4" x 4" common rafters and 4off - 4" x 4" jack rafters with these being stickered and stacked in the barn to season.

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Ken Hume
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Posts: 641
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Post Re: Douglas Fir - One Tree project
on: August 18, 2021, 09:38
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We were short 2 straight braces for sidewall frame #2 and so we headed out into the woodland to find some decent stock. A European larch tree with blown out top was chosen.

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This yielded 8" x 3" halved brace stock and a curved butt log that will be hewn to make a cranked tie beam.

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The brace stock was fashioned into 2 sidewall braces, cut to size with bare faced tenons ready for fitting into the wall post and plate mortices.

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