Timber weight and m3

[Crazy Cutter]

As a rough and ready rule I have room on my trailer for 20 cu metres of timber. Roughly 50% air space so 10 cu metres of solid tmber = 10 tonnes when green. If its part seasoned and weighs 8 tonne all the better I dont want to buy water or pay fuel to take it home.

 

And someone using the 50% ratio like me not 30% like some consultants try! My faith is restored twice in one evening!

[Ben Ballard]

As a rough and ready rule I have room on my trailer for 20 cu metres of timber. Roughly 50% air space so 10 cu metres of solid tmber = 10 tonnes when green. If its part seasoned and weighs 8 tonne all the better I dont want to buy water or pay fuel to take it home.

 

good to see this thread still going,nice bit of info gensetsteve:001_smile:

[TimberCutterDartmoor]

I dont understand how beech and oak are listed as the lowest weight per cubic metre and softwood the highest, i'd expect the opposite, wondering if some of the figures are mixed up. Interesting thread though.

 

Yeah likewise, i.e. larch = 0.8t per m/3 green...

 

It's all in the blue book

[Ben Ballard]

Because it was wrong in the third edition maybe or you are interpreting it wrong

 

Is green pine ~2/3 water or only ~200kg lighter than dry concrete, I think not

 

If standard density is 1 = 1000kg per 1m3 then the green figures could be a division factor of 1 / X = Y * 1000 = Zkg

 

 

 

1m3= 1 / 1.98 = 0.5085kg = 505.8kg per 1m3

 

 

 

1m3 = 1 / 1.20 = 0.8333 = 833.3kg per 1m3

 

 

 

1m3 = 1 / 1.15 = 0.8695 = 869.5kg per 1m3

 

 

 

1m3 = 1 / 1.04 = 0.9615 = 961.5kg per 1m3

 

 

 

 

1m3 = 1 / 0.97 = 1.0309 = 1030.9kg per 1m3

 

 

 

1m3 = 1 / 1.28 = 0.7812 = 781.2kg per 1m3

 

 

 

1m3= 1 / 0.94 = 1.063 = 1063kg per 1m3

 

if you then look at it the “pine=m3=1.98 tonne” vs. “1m3= 1 / 1.98 = 0.5085kg = 505.8kg per 1m3 (600kg dry)” is the only figure that falls short of dry weight due to the “1.98” being an error.

 

b101uk set it out how it should of been timbercutter

[Treemon]

What ??

[Ben Ballard]

What do you mean What? i was just pointing out my mistake had been pointed out by b101uk already

[likeitorlumpit]

This timber thing is just too complicated

I'm gonna stick with nuclear physics:001_smile:

[TimberCutterDartmoor]

I can see why the truckers need to charge by the ton for carriage but the wood should be sold by volume at all points in the chain.

 

I wish; saying that fiddling is going to affect both measurements sadly... Imagine a truck carrying 25m3 of balsa vs 25m3 of granite!!!

 

how would that work.........imagine an FC site with 20000 tons at roadside...r u goin to measure all the logs seperately to get their volume and u cant trust harvesters computer measurement systems ...to easy to fiddle if u wanted to.

 

I was wondering that about harvester measurements earlier; anyone know the true accuracy; theoretically the stoke and top/d o/b should be easy and variables programmble? Can make it a pita for the logger though; trying to get timber out of the wood asap... Think the USA only do vol now (board ft)...???

 

And someone using the 50% ratio like me not 30% like some consultants try! My faith is restored twice in one evening!

 

So long as you mean hardwood. I've a stack of larch that has been piece measured and comes up at 810m3 but the buyer wants to apply 55% to it. 5400 sticks came up at 66% which proves 55% is taking the proverbial.

Edited June 16, 2012 by TimberCutterDartmoor

[Brushcutter]

 

I was wondering that about harvester measurements earlier; anyone know the true accuracy; theoretically the stoke and top/d o/b should be easy and variables programmble? Can make it a pita for the logger though; trying to get timber out of the wood asap... Think the USA only do vol now (board ft)...???

 

In Finland 90% of timber measurement is done by the harvester computer so you have to be accuare. 4% error by volume mesured/displayed is set in law!

 

Every day you have to cut test calibration bits. Measured by logger tape and diameters taken with calipers along the bits. The machine also keeps a record of stem profiles cut for future predictions. The computer will randomly want you to test a bit. Each species is calibrated so you can get it accurarte.

 

My sawlogs were around +0.5% volume and +1.5% on pulp.

[Backpain]

i would love to see what holly is or yew is.

 

Each log weighs a ton! I lifted one yesterday and it nearly gave me a hernia.......