Tools Flashcards
When using a hack saw, how many teeth must be in contact with the metal?
More than one
What technique is used to produce a good cut with a hack saw?
Hold at an angle Forward stroke under pressure Return stroke without pressure Use whole blade Near end of cut, reduce pressure
What has to be remembered when fitting normal hacksaw blades and junior hacksaw blades?
Normal - Teeth pointing away from handle
Junior - Teeth pointing towards handles
What prevents the hacksaw blade from binding in the material when in use?
Blade is waved
What is a Double-Cut file?
Two sets of teeth overlaid for faster material removal
When would a double-cut file be used?
Fast metal removal
Where rough finish is permissible
What types of cuts of files are there?
Single
Double
Rasp
Curved (dreadnought)
How is a file best used?
Bench vice 5-8cm below elbow
Gentle pressure on forward stroke
One hand on handle, other on file itself
Purpose of draw-filing?
Finishing off a material
Smooth finish
What is the purpose of the flute on a drill?
Removal of swarf
Allow cutting fluid to reach cutting lips
What elements make up the body of the drill?
Lip, land, margin, flute
What type of drill is best for sheet metal work?
Jobber drill
What is the drill point angle utilised for general purpose drilling?
118 degrees
140 degrees
80 degrees
A pillar drill makes it possible to do what?
Precision work
Advantages of pneumatic drills
Less hazardous
Control
Probable causes if a drill won’t feed into the material?
Blunt
Drill too large (pilot hole required)
Purpose of a drill guide?
Keeps the drill 90 degrees to the skin surfaces
How is a hole-finder used?
Resembles a clamp that slips over the new skin
Pin underneath which fits through the hole in the structure
Shows drill where next hole will be
How is a drill gauge used?
Tip of drill inserted into holes until one fits
Advantages of a drill agent?
Lubricates
Cools
Improves tool life
Two systems of fits?
Hole based
Shaft based
Common factors that affect the size of a reamed hole
Pilot-hole diameter Hardness of material Speed Sharpness Feed
What is knife-edging?
Sheet metal being countersunk entirely through the sheet
What countersink angles are in aviation?
82 degrees
120 degrees
100 degrees
