7B Flashcards
7b study
What is workman ship
Workmanship is the degree of skill which a product is made or job done
What are the 3 standards of workmanship
- Private
- Organization
- International
What is tolerance?
The upper and lower difference between the nominal size
What is allowance?
The difference in size between 2 manufactured parts (note the difference between that and tolerance)
What is regularly required with tools?
Calibration
What should be kept with tools
A register that details the calibration and standards used
What should always be checked calibration wise before a tool
That is is ‘zeroed’ and has a calibration tag
What should a ball pein hammer not be used for?
Driving nails but can be used for working metal and driving
What does a cross pein hammer work for
Access to smaller areas
What is a sledgehammer used for?
Driving heavy pins and stakes with a lot of force
What are panel hammers used for?
Smoothing out/removing dents in metal and also stretching it out
What are soft head hammers used for?
-Seat or position work for machining
-Strike surfaces without damaging them
-Strike full impact blows without rebounding
Hammer safety
-Secure head and wedge is in place
-Check the head for splits and burs
-Wipe hands and handle
-Remove any oil, grease or dampness
What are punches for
-Making small indents
-Marking
-Stencilling
-Cut holes
-Drive pins etc
What is mushrooming
The shank end deforming and becoming shaped like a mushroom. Returned to shape using a bench grinder
What are Prick punches
Small-sharp pointed punches used for transferring dimensions and markings onto sheet metal for cutting
Dont use for driving rivets or pins from holes
What is the difference between a centrepunch and prick punches
Larger, ground to a larger diameter and produce a bigger hole
What is centrepunch used for
Locate a spot and to punch an initial hole for drilling
What is a main difference between a file and a chisel?
Files have a large number of cutting edges. Files are used by hand
Parts of a file
To obtain the best results, you should be familiar with the parts of a file:
The tang, on which a handle should always be fitted, is not hardened like the body of the file.
The heel is the portion between the tang and the teeth.
The faces are the main surfaces on which the teeth are cut.
The edges are two sides, mainly on flat files, on which teeth may or may not be cut.
The point is the end opposite the tang.
The back is the convex side of a half-round or similar file.
A safe edge is an edge on which no teeth are cut. This permits a corner to be cleaned out without damage to adjacent faces.
What can files provide?
Files can provide either a rough finish or smooth finish depending on what the operator wants
What are the different types of teeth for a file
Single Cut
Double Cut
Dreadnought cut
Rasp
What are the 3 standard cuts for files?
Bastard Cut: Removing large portions easily but produces a rough finish
Second Cut: Cuts slower than bastard but produces a smoother finish
Smooth cut
What are the different coloured aviation snips and what do they do?
Yellow: Cut straight
Green: Cut Right
Red: Cut left
True or false: Hacksaws can take different blades and the tension can be adjusted
True
What can handles look like?
They can be either pistol gripped or like a file
At least how many teeth should be in contact with a material at one time on a hacksaw
3
What are the three major parts of a drill bit
Shank
Body
Point
Formula for RPM of a drill speed
RPM = (cutting speed x 4)/Diameter of cutter
Do you want a sharper drill bit (lower angle point) or flatter drill bit (larger angle) for drilling harder materials
large angle, 150 degrees
What is the angle of a standard drill bit
118 degrees
Why would you use a counter sinking tool and how does it work
To prepare the aircraft skin for flush rivet heads. This is done by either cutting away a portion of the metal to match the taper of the rivet head or by indenting (by pressing) the
edges of the hole to accept the rivet head
What are straight fluted drills used for and what precautions do you need to be aware of when drilling with a straight flute bit
drilling into brass. chippings dont clear as well so you need to frequently stop drilling
