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2 sheet metal struct
| Question | Answer |
|---|---|
| What is the major type of damage to aluminum structures that is caused by exposure to the weather? | Corrosion |
| Name several methods for forming sheet metal? | Bending or folding, stretching,shrinking, bumping, and crimping. |
| What are the dimensions of a properly formed rivet head? | The head should be 1 1/2 times the shank diameter in width and 1/2 the shank diameter in height. |
| Describe the markings found on the heads of A, B, D, AD, and DD rivets. | A rivets are plain, B rivets have a cross, D rivets have a raise dot, AD rivets have a dimple, and DD rivets have a Double Dash. |
| What happens to the stem of a self-plugging (friction lock) rivet when the rivet is installed? | The stem is pulled until it snaps off and the remaining projecting part is trimmmed flush with the head. |
| Name at least three types of self-plugging mechanical lock rivets. | CherryMax, Cherrylock, Olympic Locs and Huck. |
| What is the difference between tools required to pull a CherryLock rivet and a CherryMax rivet? | CherryLock rivets require a tool for each different size and head shape, while one pulling tool will set any size CherryMax rivet. |
| Which of the five stresses is the most common cause of rivet failure? | Shear |
| If a 2024 rivet must be replaced with a 2117 rivet, how do you determine the size to be used? | For 5/32 or smaller diameter use the next larger size 2117 rivet, assuming that the edge distance and spacing, meet the minimum requirements. |
| Describe the process for determining the total length of a solid rivet for a particular installation. | Add the group length (thickness of the materials being joined) plus 1 1/2 times the rivet diameter. |
| What minimum edge distance and spacing should be used for a single row of protruding head rivets? | Not less than two rivet diameters from The Edge and not less than three rivet diameters apart. |
| How can a mechanic determine whether the countersink for a flush rivet should be dimpled or drilled? | By the thickness of the top sheet; thin sheets are dimpled while thick sheets maybe countersunk. |
| What action is taken to prevent cracks from forming while dimpling magnesium or some hard sheet metals? | Hot dimpling equipment is used to preheat and soften the metal before the dimple is formed. |
| What type of damage can occur when using a rivet set that does not properly fit the rivet? | If the radius of the set is too small, the rivet head may be damaged, whereas a set with an oversized radius may cause damage to the sheet metal. |
| Why is it important to use the proper size and weight bucking bar when performing sheet metal riveting? | If a bucking bar is too large or heavy it may be difficult to control and may cause damage to the surrounding structure, whereas as a bucking bar that is too light will not properly upset the rivet before work hardening occurs. |
| What procedures should be followed to properly remove a solid-shank rivet? | Centerpunch the rivet and then drill just to the base of the rivet head with the same size/one size smaller drill.Once drilled, use a pin punch to tip off the rivet head and drive the remaining shank out of the hole while supporting the surrounding metal. |
| What are the two special calculations that must be made when bending sheet metal? | Bend allowance and setback. |
| What factors must be considered in order to determine setback? | The thickness of the metal and the bend radius. |
| What is done to a corner where to bends intersect to prevent cracking? | Relief holes are drilled in the corner. |
| What are the two reasons for installing a lightning hole in a sheet metal wing rib? | Lightning holes reduce the weight and increase stiffness. |
| Describe a Joggle and explain its function. | A Joggle is an offset formed at an intersection of two or more sheets of metal to allow the multiple sheets to be stacked flat against each other. |
| When repairing an all-metal aircraft, how do you determine what metals should be used? | Always use metal of the same type and thickness as the original structure. |
Created by:
Big.Bear.M
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