This will help in the filtration problem.
http://www.arboristsite.com/showthread.php?t=132216
No mate, sorry.
The only numbers I have are for commercially used timbers.
I don't think I've even found any numbers for Yellow or White Box either, and they make Iron Bark look soft when crosscutting dead logs.
Bob posted some numbers for Tuart and Gidgee in that thread I linked to (i think)
Before I came to this forum, I thought Euclyptus was just one tree. Heck it's almost every tree over there, right? Just different types.
Here's a bunch of Aussie wood Janka hardnesses from the supposed worlds top 100 hardest timbers taken from http://www.morlanwoodgifts.com/MM011.ASP?pageno=207 site, these are all for 12%MC timber. FOr comparison Osage Orange is 2320 and Hickory is 1820
4270
Gidgee {Acacia cambagei}
3370
Box Grey {Eucalyptus microcarpa}
Mallet Brown {Eucalyptus astringens}
Wandoo {Eucalyptus wandoo}
3200
Casuarina {Casuarina equisetifolia}
3125
Gum Grey {Eucalyptus propinqua}
Ironbark Grey {Eucalyptus paniculata}
Ironbark Red Broadleaved {Eucalyptus fibrosa}
Ironbark Red Narrowleaved {Eucalyptus crebra}
Sheoak Rose {Casuarina torulosa}
2920
Bloodwood Brown {Eucalyptus trachypholia}
Box Grey Coast {Eucalyptus bosistoana}
Box Yellow {Eucalyptus melliodora}
Ironbark Red {Eucalyptus sideroxylon} 2
2800
Box White Topped {Eucalyptus quadrangulata}
2700
Gum Red Forest {Eucalyptus tereticornis} 2700
Gum Round Leaved {Eucalyptus denei} 2700
Messmate Gympie {Eucalyptus cloeziana} 2700
Missing from his list is
Gimlet {Eucalyptus salubris) 4190
Black Morrrel {Eucalyptus melanoxylon) 3460
Dundas Blackbut {Eucalyptus dundasii} 3960
Red Morrel {Eucalyptus longicornis} 3840
Salmon Gum {Eucalyptus salmonophloia} 3480
Another I have experience with is
Raspberry Jam {Acacia acuminata} is probably over 3500
Under this rating yellow and white box are not as hard as Iron Bark
However, these are indentation hardnesses, apparent cutting hardness are different and are related to things like the degree of cross graininess and the amount of silica that the timber has drawn up.
Some dead trees are all MUCH harder to cut up than trees felled as live and health plants. Dead trees will generally have undergone some stress before they die and it during this period that they pull up silica which adds to the apparent cutting hardness - the trees are not actually harder but the silica takes it toll on cutter edges making them seem hard.
The other thing that affects cutting hardness is where on a tree is being cut. The base and regions near crotches can be up to 20% harder than in the middle of s straight length of trunk.
BTYW these very hard timbers are fantastic for the fingerboards and bridges of stringed musical instruments, here a pick of a guitar I made using gidgee as the fretboard and bridge.
Just over 900 recorded species according to my EUCLID Eucalyptus ID program
There is certainly a lot of them around over here - they are in basically every area. Hot, cold, dry, wet etc etc...
[snip]
If the wood is as hard and fine as you say (cue drama llama now), why bother to cut it?
Mates.
Pandas eat bamboo.Thats insane! I swear I thought Eucalyptus was the name of a single tree. Learn something new every day.
So is'nt that what Koala bears eat? or is it pandas?
The koala will eat the leaves of a wide range of eucalypts, and occasionally even some non-eucalypt species such as Acacia, Leptospermum, and Melaleuca. It has firm preferences for particular varieties of eucalypt and these preferences vary from one region to another: in the south Manna Gum, Blue Gum, and Swamp Gum are favoured; Grey Gum and Tallowwood are important in the north, and the ubiquitous River Red Gum of the isolated seasonal swamps and watercourses that meander across the dry inland plains allows the koala to live in surprisingly arid areas.
Here's a bunch of Aussie wood Janka hardnesses from the supposed worlds top 100 hardest timbers taken from http://www.morlanwoodgifts.com/MM011.ASP?pageno=207
[snip]
Thats insane! I swear I thought Eucalyptus was the name of a single tree. Learn something new every day.
So is'nt that what Koala bears eat? or is it pandas?
Pandas eat bamboo.
From wikipedia
first of all HUSKY SUCKS :biggrinbounce2:
2nd, its not just the hardness but the sand and grit in the timber as it grows a slow hard life....plus the fact that alot can be in flood regions that see huge changes in water level (once in a life time lol) which carries with it crap etc...
3rd Tdi-rick knows a thing or 3 about filters and oil....trust me
4th did I say HUSKY SUCKS :deadhorse:
Yep, Palm is pretty nasty on magnesium.
Ekka knows all about it, it's about all he works on where he is and he goes through saws pretty frequently as a consequence.
I was wondering about the sand growing into it as it matures.
I was told that a concrete saw with a carborundum blade (cast iron cutting, maybe) works well for cutting up railroad ties. Guess it only goes so deep, but a rather unique idea.
I heard also about chemicals in the wood eating up magnesium cases. Palm or something, I think.
Logging is obviously tough in Australia. I bet some of these woods are pretty exotic looking.
Logging is obviously tough in Australia.
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