C3 - LT#3 - Use a Thickness Planer Flashcards
What is the main task of a thickness planer (ONLY TASK…)
It dress lumber to a uniform thickness
What control on a thickness planer sets the thickness of the lumber will be after it has been planed?
Elevating wheel & lock
What is the PRO of segmented infeed rollers in a thickness planer?
Allow feeding pieces of stock that are a different thickness through the planer at the same time
What is the purpose of the upper outfeed roller?
It pulls lumber through the planer after it clears the infeed roller
Explain the role of the lower rollers in a planing operation?
Prevents lumber from dragging too heavily on the table
Which part of the thickness planer directs the flow of chips away form the operator
Chip guard
In which direction should the grain slope when you plane lumber in a thickness planer?
Must slope downward toward the front of the stock
In a single pass through a thickness planer, wide boards should have no more than how much stock removed.
1 mm
The thickness planer is known as a specialty machine because it only does one thing
True
To obtain a straight, flat cut in a thickness planer, lumber must be:
Bottom must be straight and flat
Explain how lumber must be turned in order to have both sides planed with the grain
Turn the stock over and end for end
When you feed lumber into a thickness planer, where should you stand?
To the side
Before starting the thickness planer, clean away debris from the where?
Lower the table & remove any shavings, loose knots and slivers of wood from the table and roller assembly
Most thickness planers remove no more than how many MM?
3 mm
What should you do if a stock gets stuck or the cutter stalls in operation?
1) Turn off
2) Lower bed
3) Remove stock
What adjustments should you make when you plane wide planks in a thickness planer?
The amount removed in ea. pass should be reduced to prevent overheating the motor or stalling the cutter.
What happens to the thickness planer if you try to plane-painted or varnished lumber?
The finish will quickly dull the blades
What happens if the grain of the plank you run through a thickness planer is in the wrong direction?
Produces a chipped surface
In the correct sequence, name the parts of a planer the UPPER surface of a plank touches as it goes through the machine.
1) Infeed roller
2) Chip breaker
3) Cutterhead
4) Pressure bar
5) outfeed roller
If you remove too much stock at one time with a thickness planer, you risk overheating what?
The motor
If the plank you want to plane is thicker at one end than at the other, what should you do?
Insert thick end first - prevents jamming or stalling
You risk pinching your fingers if your stock is
Too short
What should you use to remove dirt, pitch and gum from the surface of a thickness planer?
Petroleum-based solvent to clean all accumulations
Why is it important to clean the rollers of a thickness planer?
Accumulation will leave the indentations on the lumber
If stock hesitates or sticks in a planer, what could be the issue?
Lower roller could be set too low
What can cause lumber to chatter as it passes through a thickness planer?
Lower roller is set TOO HIGH
If you find that lumber does not leave a planer properly, what might be the cause?
The pressure bar may be set too low
The rotation of knives in the cutterhead (planer)
4000 & 20 000
Are both the rollers Upper infeed and outfeed powered?
Yes and spring loaded
Purpose of lower rollers (Planer)
1) Prevents lumber from dragging too heavily on table
2) may be idlers or under power
Spring loaded pressure bar presses lumber to prevent
Chattering
The chip breaker prevents knives from
Tearing long slivers from the wood
What is the average feeding rate for planers?
About 16 to 20 feet per minute
Planing against or with the grain?
With the grain
The maximum amount of stock removed with each pass?
not to exceed 3 mm on wide 1 mm
Bowed, the warped and twisted stock should have what?
Have one surface jointed before it passes through
