2A753 CDC Exam 84 Questions with Verified Answers
What adjustment is required when the bar folder does not operate freely? - CORRECT ANSWER
... [Show More] Thickness
What do you adjust if the cornice break bends a piece of metal excessively at one end? - CORRECT ANSWER Top Leaf
You can form a conical shape with the slip roll former by - CORRECT ANSWER setting the back roller at an angle
When stretching and shrinking, the edge of flanges can crack and split as the result of - CORRECT ANSWER repeating the strokes too long in one spot.
Which forming process involves using a smooth-face dolly? - CORRECT ANSWER Bumping
Which hand-forming operation refers to the reduction of an area of a piece of metal? - CORRECT ANSWER Shrinking
What do you usually use as a support during the bumping process? - CORRECT ANSWER Sandbag
A blowhorn stake is best suited for - CORRECT ANSWER Shaping objects with abrupt tapers
What do you select to rivet, form, and seam square or rectangular shaped materials? - CORRECT ANSWER Solid mandrel stake
Which method of curving an extruded angle is usually more satisfactory because it is faster and easier, and affects the metals less? - CORRECT ANSWER V-block
If you need to add additional crimps to shrink a formed angle, you place them - CORRECT ANSWER Between the original crimps
When forming a flange by shrinking you start hammering on an angle at - CORRECT ANSWER the center, working gradually toward both ends
When you're hand-forming an angle by shrinking, the flange tends to - CORRECT ANSWER Buckle at the bend
When forming a flange by stretching you start hammering on an angle - CORRECT ANSWER the center, working gradually toward both ends
If the material is not held flat against the face of the form during the bumping process it will - CORRECT ANSWER Buckle
In what series technical order (TO) can you find specific equipment maintenance inspection and maintenance requirements? - CORRECT ANSWER 34- series TOs
What grit of sandpaper do you use to properly remove oxidation from the bare metal of a machine surface? - CORRECT ANSWER 400-grit sandpaper
What Air Force Technical Order (AFTO) form is used to document equipment maintenance? - CORRECT ANSWER Form 244, Industrial/Support Equipment Record
What section of the Air Force Technical Order (AFTO) form 244 is used to document equipment discrepancies? - CORRECT ANSWER Section V
When documenting equipment discrepancies, what does a red X denote on a n Air Force Technical Order (AFTO) Form 244, Industrial/Support Equipment Record? - CORRECT ANSWER Equipment is unsafe or unfit for use
What adjustments must be made before using a bar folder? - CORRECT ANSWER Adjustments for material thickness, and fold width, sharpness, and angle.
What is the largest depth of flange you can make on a bar folder? - CORRECT ANSWER 1 inch.
What do you do to apply pressure to metal being formed with a bar folder? - CORRECT ANSWER Pull the operating handle toward you.
What is the largest flange (depth) that you can form on a cornice brake? - CORRECT ANSWER Unlimited
How many degrees must you add on to allow for spring back when using a cornice brake? - CORRECT ANSWER 3 degrees
If the bending leaf on a cornice brake is properly adjusted, what should the clearances be at the center and ends? - CORRECT ANSWER The edge of the leaf should be 1 /32 inch below the bed center and 1 /64 inch below the bed edge.
How can you check to ensure the bending leaf is not bowed? - CORRECT ANSWER Use a straightedge
How does a box-and-pan brake differ from a cornice brake? - CORRECT ANSWER The clamping leaf is divided into sections called fingers or shoes
What advantage does a box-and-pan brake have over a cornice brake? - CORRECT ANSWER It permits forming of all four sides of a box without distorting any of the finished bends
What factor determines the adjustments on the cornice and box-and-pan brakes? - CORRECT ANSWER Thickness of the metal to be bent.
What shapes may be formed with the slip roll former? - CORRECT ANSWER Cylinders and permanent curves.
Which roller of the slip roll former is moved to decrease the radius of forming? - CORRECT ANSWER The lower rear roller.
If a cylinder is over formed on one end and under formed on the other, what mistake was made in using a hand-operated slip roll former? - CORRECT ANSWER The lower rear roller was not adjusted to produce the same radius at both ends of the cylinder.
How should you clean the rollers on a slip roll forming machine? - CORRECT ANSWER Clean the rollers with steel wool and a dry rag, and then wipe the rollers with an oiled rag.
What happens to the flange when the movements of the jaws on a shrinking and stretching machine move inward? - CORRECT ANSWER The flange is shrunk.
What direction do the jaws move on a shrinking and stretching machine when stretching metal? - CORRECT ANSWER Down and outward.
What causes splitting or cracking of the flange being formed? - CORRECT ANSWER Applying repeated strokes to one spot on the flange
When using a shrinking and stretching machine what is the procedure for feeding the work to ensure effective forming? - CORRECT ANSWER Enter the work piece to the centerline of the jaws and feed the work through the machine in equal distances for each stroke of the jaws
What should you do to ensure proper movement of the forming jaws? - CORRECT ANSWER Periodically remove the jaws, disassemble them, and clean them of grease and metal deposits.
Why should you use a lubricant when pressing parts? - CORRECT ANSWER To prevent galling or chaffing the metal.
When pressing an anti-friction bearing, where on the bearing should you place the ram? - CORRECT ANSWER Squarely on the face
Define the forming term "bumping." - CORRECT ANSWER Forming or shaping metal by hammering or pounding.
Why do you crimp metal? - CORRECT ANSWER To make one end of a section of pipe slightly smaller so it slip-fits into the plain end of a similar section of pipe.
Describe the common method used to stretch a flat piece of metal. - CORRECT ANSWER Force the metal outward toward the edges by hammering on areas supported by an anvil or similar base support.
Describe the shrinking process - CORRECT ANSWER Compressing or forcing material into a smaller area
When forming aluminum what type of hardwood material is recommended for fabricating form blocks? - CORRECT ANSWER Ash and maple.
What type of forming blocks do you select if you want to form a piece of metal by crimping? - CORRECT ANSWER Shrinking blocks.
What is usually used for support during the forming process of bumping? - CORRECT ANSWER Sandbags
Name the correct stake to be used for the following operations: a. Riveting pipes and elbows.
b. Support when laying down double seams on small cylindrical objects.
c. Tube forming
d. Forming irregularly shaped objects.
e. Making straight line bends. - CORRECT ANSWER (a) Conductor.
(b) Double-seaming (simple).
(c) Candle mold.
(d) Roundhead.
(e) Hatchet.
When stretching a flange using a V-block, where should you hammer the metal? - CORRECT ANSWER Always directly above the V in the block.
How can you make sure you won't over form a flange when you're stretching an extruded angle on a V-block? - CORRECT ANSWER Make a full-sized, accurate pattern that you can use to check the accuracy of the part being formed.
How can you recognize when a piece of metal being formed is work hardening? - CORRECT ANSWER Lack of spring back or bending response.
Why is the V-block method of shrinking a flange preferred over the shrinking block method? - CORRECT ANSWER Because it's easier and faster, and affects the metal less.
If you are using a V-block to shrink a flange, in what direction do you point the flange to be shrunk? - CORRECT ANSWER Upward
Why do you strike the edge of the flange at a slight angle when shrinking a flange on a V-block? - CORRECT ANSWER This keeps the vertical flange from bending outward.
When do you use the shrinking block method of shrinking a flange? - CORRECT ANSWER When the curve in the formed angle is to be quite sharp or when the flanges of the angle are rather broad.
Why should crimps be kept as small as possible? - CORRECT ANSWER To reduce the difficulty in working out the crimps
What factors determine the size of a crimp? - CORRECT ANSWER The thickness and softness of the metal.
Where do you position additional crimps when you're performing a second crimping process to complete a crimping job? - CORRECT ANSWER Between the original crimps.
If you form a flanged angle with the flange pointed toward the inside of the bend, what must you do to the metal on the flange? - CORRECT ANSWER Shrink it.
What type of blocks do you use when flanging angles? - CORRECT ANSWER Wooden form blocks.
Where do you start hammering when forming a flanged angle by shrinking? - CORRECT ANSWER Near the center.
What effect does the material composition of the form block have on the type of hammer used? - CORRECT ANSWER It determines the kind of hammer you use.
How does the hammering procedure for forming a flange angle by stretching differ from that required for shrinking? - CORRECT ANSWER When shrinking, you start at the center and work the flange down gradually toward both ends; when stretching, you start at the ends, working toward the center.
What must you do to the metal to form concave flanges? - CORRECT ANSWER Stretch it.
What must you do to the metal to form convex flanges? - CORRECT ANSWER Shrink it.
What's used to keep the metal being formed from shifting within the form blocks during the forming operation? - CORRECT ANSWER Alignment pins.
Why is one form block undercut when you're forming curved convex and concave flanges? - CORRECT ANSWER To allow for spring back.
When forming curved parts, why is the concave curve formed first? - CORRECT ANSWER This helps keep the flange from splitting open or cracking when the metal is stretched.
When forming curved concave flanges why do you hammer at the ends and work toward the middle? - CORRECT ANSWER Permits some of the excess metal along the tapered portion of the flange to be worked into the curve where it's needed.
Where do you start hammering when you're forming curved convex flanges? - CORRECT ANSWER At the center.
What procedures can you follow to reduce the possibility of buckles and splitting or cracking when forming curved convex flanges? - CORRECT ANSWER Keep the edges of the flange as nearly perpendicular to the forming block as possible.
The finish dimension of a die used for bumping should be the same as what dimension of the part being formed? - CORRECT ANSWER The outside dimension.
Why should the hold-down plate used during bumping be just tight enough to hold the material flat against the face of the form block? - CORRECT ANSWER So the metal can be drawn into the form block.
How much metal should you allow for drawing when forming by bumping dies? - CORRECT ANSWER ½ to 1inch.
Where should you start hammering when using die blocks? - CORRECT ANSWER Near the edges.
When must a prior-to-use inspection be completed? - CORRECT ANSWER Before the machine is used for the first time on any given day.
What should you look for when inspecting rubber hoses? - CORRECT ANSWER Chaffing, dry-rot, cracks, or excessive wear.
What guidance is used to determine equipment lubrication requirements? - CORRECT ANSWER Air Force directives or approved commercial data.
What grit of sandpaper is used when removing oxidation from bare metal equipment surfaces? - CORRECT ANSWER 400
What form is used to document equipment maintenance? - CORRECT ANSWER AFTO Form 244.
What section of the Industrial/Support Equipment Record documents scheduled inspections? - CORRECT ANSWER III
What symbols are used to document equipment discrepancies on the Industrial/Support Equipment Record? - CORRECT ANSWER Red X, dash (-), and diagonal (/)
When documenting equipment discrepancies on the Industrial/Support Equipment Record, how do you document a scheduled inspection that is overdue? - CORRECT ANSWER By placing a red dash (-) in the symbol block [Show Less]