Técnicas de aserrado para madera rescatada

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my name is scott landis and i’m the

president of greenwood

an educational nonprofit that connects

sustainable forest producers

with a talented network of woodworking

entrepreneurs and world-class

designers it’s a whole value chain

approach

linking wood from managed forests with

artisan producers

quality designs and ultimately good

markets

we aim to deliver the highest value from

every harvested tree

to the people who live closest to the

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forest

after a tree has been fell transforming

the logs into lumber is the first step

of almost all woodworking activities

this process is most often achieved by

use of a sawmill it’s a multi-step

process that prepares the wood for

drying and further transformation

into furniture musical instruments or

artisanal wood products there are many

different types of sawmills but one of

the most popular especially

in remote forest areas is a portable

bandsaw mill

another popular option is a chainsaw

mill which is sometimes referred to as

an alaska mill

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milling is a critical step in the

transformation of most wood products and

it’s important to break down the log

in the way that will yield the best

quality wood for your intended market

at the end of the day the strategy and

techniques you employ in milling each

log should maximize yield

and minimize waste providing lumber that

can be used most efficiently

by the woodworkers who will produce a

finished product adding the greatest

value

to each harvested tree my name is john

curtis

i am vice president of greenwood i live

in mexico and work with forest

communities

and i’ve been with scott for many years

and we’ve together we’ve been to

peru and honduras and now we’re here in

puerto rico working on this very

interesting project

and we’re very happy to be here

after a hurricane event a wide variety

of downed trees

become available the origin of the tree

will determine some of the logs

characteristic trees

for example that are sourced from the

plantation natural forest

or an urban area will differ in trunk

length

wood quality and accessibility while

plantation logs are

straight and less dense natural forest

logs will have

longer trunks but are less accessible

while plantation harvested logs

are maintained to be straight clean and

ideal for the development of wood

product

rescued urban logs often have unique

characteristics that

woodworkers should be aware of

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rescued urban logs may contain metal

debris such as nail they also may have

insect damage from being in contact with

the ground for extended periods

after a hurricane the most important

steps in rescuing logs are to identify

which ones are actually worth milling

next the ends should be sealed

and the logs should be elevated in a

shaded area to protect them from direct

sunlight

insects and moisture while rescued urban

logs come with their challenges

their often unique characteristics tell

an interesting story

of the life of the tree

rescuing any log the first step is to

plan the dimensions required for your

project

there are standard dimensions of the

lumber created in the milling process

depending on the project at hand for

example when making furniture

the standard is to cut lumber that

measures

four quarter five quarter six quarter

and eight quarter which

translates to one inch inch and a

quarter inch and a half

etc

to prepare your log for milling you must

first remove the bark

and use a metal detector to locate metal

that might damage the saw

afterwards clean up the ends of the log

which allows you

to analyze the log for best yield and

finally

position the log for your first cut

before milling your log into lumber

prepare your sawmill equipment by

checking the gas oil and coolant supply

then check the tension and sharpness of

the blade also

be sure to clear obstacles from the work

area and make sure

you’re wearing the proper safety

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equipment

there are several different milling

techniques each with their own benefits

the most popular milling technique is

through and through milling

sometimes referred to as flat sign

through and through milling is

the most common technique because it’s

the easiest

and the fastest way to saw a log this

technique produces the most variety of

grain patterns

although there is more shrinkage and

movement in half of the board

and this technique produces the lowest

value per board foot

but the highest yield

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another popular technique is quarter

sawing quarter sawing is a

favorable milling technique because it

yields higher quality boards

these boards are more stable because

they shrink less

across the width also quarter sawing

produces

less variation in brain pattern while

quarter sign

requires more work and produces a lower

wood

yield the resulting boards are of higher

value

finally the radial sign technique

produces the highest value per board

foot

the grain pattern is the most uniform

but depending on the species

can be quite spectacular however this

technique requires the most

time and effort because additional

equipment is needed

this technique also has the lowest wood

yield

it’s also important to note that quarter

sawing

and radial sawing techniques require the

highest quality logs

i’m not an artisan but a lot of what

motivates me is applying artisans with

the raw material

and this is some of the highest quality

raw material that there is and so it

gives a great satisfaction

and that’s why it’s my favorite

technique but

it is a lot more work

are an extreme climate event that have

great effects on trees and forests

the 2017 hurricanes in puerto rico and

the u.s virgin islands left hundreds of

thousands of fallen tropical hardwood

trees

much of this valuable wood was lost the

experience raised awareness of the need

for training and capacity building in

the wood industry

in order to make the best use of the

wood for local economic and cultural

benefits

milling is a key step in the journey

from a fallen tree to a high-value wood

product

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you