INTRODUCTION TO DESIGN &

TECHNOLOGYFinal Review

Oxy-Acetylene Terms Fusion -- Heating two pieces of metal to

their melting point and allowing them to flow together.

Base Metal -- Metal to be welded Penetration -- Distance at which fusion

ceases Inner Cone -- Inner white part of Neutral

flame Tack Weld -- Short weld to temporarily hold

metal in place Backfire –Momentary burning back of flame

into the tip. Flame goes out with a loud pop.

Flashback – Flame burns back inside the torch body.

Arc Terms Arc-flow of current across a small gap. Crater--depression at the end of the weld Penetration--depth of weld into the base

metal Welding--joining of two or more metal by

fusion Spatter – Deposit of small spots or

particles of metal on the base metal. String Bead – Weld bead made with very

little rod manipulation. Pad – Series of overlapping String Beads

Arc Safety Keep floor dry to prevent electrical shock. Make sure ventilation is turned on. Always wear the proper P.P.E. Never look at an Arc without the proper

welding shaded lens. Make sure machine is properly set up

before starting the welding process. Always place the Electrode Holder on its

hook and never set it on the work bench. Never engage yourself in any activity that

would endanger the well being of yourself, other students, the teacher and the shop.

Oxy-Acetylene Safety Never adjust Acetylene above 15 psig. Stand of to one side when opening the

Regulator. Never directly in front. For a Flashback, turn off Oxygen torch

valve first then Acetylene torch valve. Keep cylinders upright and firmly

anchored. Keep valves closed on empty cylinders. Make sure Adjusting Screw is released or

turned out before opening valve.

THE FIRE TRIANGLE

OXYGENHEAT

FUEL

Classes of Fires Class A – Combustible Materials Class B – Flammable Liquids Class C – Electrical Class D – Combustible Metals

7018E = Electrode70 = 70,000 lbs. per square inch (Tensile Strength)1 = All Positions (Position)8 = Low Hydrogen, DCEP, AC, Medium Penetration (Special Characteristics)

Methods to Strike an Arc

Arc Length

Table Saw Stock must be this long to safely rip on the Table Saw:

12”

How high should the blade be adjusted above the stock: 1/8” to 1/4”

When ripping a board that is narrower then ______inches, you must use a __________ __________: - 6 & Push Stick

When ripping, when is the stock released. After it passes:- The back of the Blade Insert or Throat Plate.

How much should the stock be oversized when ripping:- 1/8”

Should the good face of the stock be facing up or down when using the Table Saw:- Up

Stand to the ________ side of the blade when ripping narrow stock:- Left

Planer Amount of material removed with each pass:

1/16”

Length the board must be to safely run through the planer: 12”

Must use this when plaining stock thinner then 1/2”: Auxiliary Bed

Have the face of the stock you want surfaced facing: Up

The Concave (cup) surface of the stock should be facing: Down

Jointer Amount of material removed with each pass:

- 1/16”

Length the material must be to safely joint:- 12”

Is the stock feed with or against the grain:- With

When edge jointing, is the “Crown” facing up or down:- Up

Miter Saw Size of saw determined by:

- Diameter of blade

Must keep fingers and hands from the saw blade this distance: - 6”

The process to line up the cut is called a: - Dry Run

Have the good face of the stock facing:- Up

Miscellaneous Rule of thumb for the depth of a Dado or Rabbet

cut if not shown on a set of plans:- 1/2 the thickness of the stock

A slot or trench that is cut with or parallel to the grain:- A Groove

A slot or trench that is cut against or perpendicular the grain:- Dado

When staining, how long should the stain soak into the wood.- Ten Minutes

When changing a Saw Blade or Router Cutter loosen the nut with the rotation.

When gluing up stock together Make sure growth rings are alternating Put glue on both parts Do not smear glue into the face grain Tighten clamp until glue beads up. Do not over tighten clamps.

On sandpaper the higher the number the finer the grit.

Before making any type of cut, make sure:

Stock is securely held down Blade or Cutter is clear of stock Proper P.P.E.

Board FootN x T x W x L” or N x T x W x L’

144 12Example:

4 – ¾” x 4-1/2” x 15-1/4”

4 x 1 x 4.5 x 15.25 = 274.5

274.5 / 144 = 1.90 Bdft.

The End