line C-3 stationary tools Flashcards
what can jointers do ?
remove warp and twist from a board and dress it flat and true
what kind of cuts can a jointer perform
rabbet
taper
bevel
chamfer stock
what are some similar parts that jointers have in common
heavy base
front infeed table
adjustable fence
what is the infeed table made of on a jointer
machined cast iron
what do you sharpen the cutter knives with on a jointer and why ?
with a stone because the high speed steel in a jointer knife is too hard for a file
how do you determine the size of a jointer
the length of the knives in the cutter head
what are the common sizes ?
150mm - 200mm
what is a snipe
a distinct change in thickness that occurs at the end of a board
what causes a snipe
having the outfeed table set too low
what are the safe operations for using a jointer ?
eye protection
keep hands away from cutter
use a push block if too small
stand to one side of the direction of the cut
hearing protection
the outfeed table of the jointer must be set to exactly match the height of the ?
knives / cutters
lumber that is bowed across its width must be jointed with the cupped side ?
down
with which part of the jointer must the stock make full contact if you want a straight cut ?
outfeed
when should you slow your rate of feed into the jointer ?
when you plane the width of the board
what adjustment must you make to the jointer fence in order to cut a chamfer
tilted
what is a thickness planers 1 task ?
it dresses lumber to a uniform thickness
what is the rotation speed of the knives in the cutter head
4000- 20,000 RPM
what do the upper infeed roller and upper outfeed roller have in common
both are under power and spring loaded
what are the two lower rollers for the infeed and out feed
may be idlers or they may be under power
what is the lower rollers purpose
prevent lumber from dragging too heavily on the table
what is the purpose of the pressure bar
prevent chattering
what is the chip breakers purpose
prevent knives from tearing long slivers from the wood
what do most planers have a rate of speed of ?
16-20 feet per minute
what are 3 rules for using a planer
must be planed with the grain not against
no more than 3mm taken off at a time
stock should at least be wide as it is thick
what control on a thickness planer sets thickness the lumber will be after it has been planed
elevating wheel and lock
what is the advantage of segmented infeed rollers in a thickness planer
arrow for different thickness’s to be planed at the same time
what should you do to remove dirt pitch and gum from surface of a thickness planer
use petroleum based solvents
what is a belt sander commonly called
finishing sander
what is a belt sanders use
for final sanding of straight stock
what are the 8 main parts of a belt sander
tracking guide knob
belt tension adjustment
stop block
rollers
spindle table inserts
sanding spindles
on/off
adjustable table
what do wide belt sanders range from
15’’ to 36’’
what are wide belt sanders commonly used for
furiture
cabinet
door manufacturing
what are the 4 common manufactured abrasives
aluminum oxide
silicon carbide
ceramic
alumina zirconia
what is the grit for aluminum oxide
24-400
what is the grit for silicon carbide
24-600
what is the grit for ceramic
24-120
what is the grit for alumina zirconia
24-120
what are abrasive backing composed of
paper ,cloth and fibre
what is open coat
abrasive materials that cover only 50%-70% of the backings surface
what is closed-coat
the grains cover the entire surface
what is coarse grit
sandpaper used in carpentry has a grit number of 50 or less
what is medium grit
grits of 60,80 and 100 or more remove machine marks on wood
what is fine grit
grits of 120,150 and 180 and more used for final stage of sanding before staining
what is very fine grit
grits from 220 to 600 are used for polishing and after coats of staining
what sander is best for sanding internal curves
belt sander
which is considered a finishing sander belt or disk and why
belt sander , disk will leave scratch marks
what sander is used for true edgers of a circle cut from wood
disk sander
which sander is used for removing end grain
disk sander
what is the function of a platen
keep surface flat
why can a belt sander cause kick back
torn or ripped paper
when sanding long stock on a belt sander the stuck must be kept?
midpoint and platen
when sanding short stock with a belt sander is best done with the help of a ?
backstop
what are 2 advantages of open coat sandpaper
flexibility and less clogging
what are 2 advantages of closed coat sandpaper have over open coat
faster and longer life span
