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Ok, we all know that each manufactore has there own prefereance for what type of wood to use in there cores, but asside from there varying densities, what makes each of these following types of woods good for use in cores.
· Aspen
· Spruce
o Fir
o Birch
o Pine
· Poplar
Thanks
You forgot maple.
As for most of the above: light weight, tensile strength, elasticity, cost, availability. What did I miss?
atomic powder pluses have oak cores
edit- Ive also seen Pacific Yew in a snowboard.
we use birch when we make bows
Doesn't Yew have some other properties it's known for? Healing related?Quote:
Originally Posted by steepconcrete
taxol for cancer, they now can make is synthetically.
we have a bunch of em in our forest, grow really slow and weird. Cool trees.
If you go to the local library you can find charts that have everything about wood. Strengh to weight ratios, density, and all that good stuff.
Conclusion:
Ratings for density:
Poplar: 4/6
Oak: 6/6
Maple: 5/6
Pine: 1/6
Hemlock: 2/6
Fir: 3/6
Ratings for elasticity:
Poplar: 4/6
Oak: 6/6
Maple: 5/6
Pine: 2/6
Hemlock: 3/6
Fir: 1/6
Ratings for force constant:
Poplar: 3/6
Oak: 6/6
Maple: 2/6
Pine: 1/6
Hemlock: 5/6
Fir: 4/6
Our final ratings go as follows1:
Poplar: 4/6
Oak: 6/6
Maple: 5/6
Pine: 1/6
Hemlock: 3/6
Fir: 2/6
1 Ratings out of 6 were first given for each section (density, elasticity, and force constant) and then averaged to produce a final, overall rating out of 6. Although we studied many other physical properties of wood (i.e. shear strength, impact bending, compression stress, etc.), we only ranked the various woods based on the elasticity lab data because we were not sure of the full name of each type of wood (i.e. scarlet oak, jack pine). If we did take into consideration the values for Table 3.21, we would either have to guess the full names of the wood we tested and then use those values, or we would have to average the values for all the different names of pine, poplar, oak, etc. However, we felt that this would affect our results in a major way so we decided to stick with our lab data, which we obtained from first-hand experience.
The largest calculated elastic energy was for oak, 37.83J, and the smallest calculated elastic energy was for fir, 13.58J. An ideal deck should be flexible to withstand certain forces that cause stress (i.e. a barbecue, patio furniture, etc.). From the physics ratings, the strongest and most suitable wood for building a deck can be determined. Based on the overall ratings (1-6, 6 being the highest rank), oak is the ideal material to build decks. However, since oak is a hardwood, it would be difficult to nail two pieces together using conventional nails. This would also mean that the remaining hardwoods that also ranked in the top three would not be suitable for the purpose of a deck, disregarding their strength. In light of this, hemlock, which had the next overall rating, would be the most practical material to build decks with. Pine, which ranked last (it was given a 1/6), would not be appropriate to use for a deck
strength and elasticy are cool, but I want to know what happens when you smack it aginst somthing...does it vibrate?
cool project MBS.
I took a class called wood techiques in college taught by this pompous ass named Dr. Bigham. I loved everything about wood, but this guy chafed me so bad, it's the only class I ever got a D in. Alot of mutual disrespect. We did microscopic analysis of woods, their properties, laminates, veneers, ad nauseum, and at the end of the semester, had to identify about 100 different woods by looks, grain, density, porosity, smell, and even taste. I forget the all the curriculum minutiae.Quote:
Originally Posted by steepconcrete
But if there's one thing yet to occur, it's finding the one perfect core. Kinda like Jimmy Hoffa. Out there, yet to be discovered. Plenty of theory, some evidence. But no body.
So much about skiing is subjective. Same with cores. And competition thrives on marketing innovation. Hence, many twists on the basics, resultant of the search for Jimmy. I hope you're not cliff noting, mbs.
Vibration has to do with density. The more dense something is the better it carries vibration.
uhhhh... tech talk?
jong.
how could you guys miss the best advice yet!!!!!!Quote:
Originally Posted by ak_powder_monkey
what are you thinking!!! AKPM uses birch when he makes bows!!!!!
:eek: :eek: :eek:
i swear that kid is Ralph Wiggum incarnate.Quote:
Originally Posted by Z