Millwright Flashcards
Taper in a bore of milling machine
Standard steep machine taper
Does the table swivel on universal horizontal mill
Fuck yes
What could be used in a heavy duty collet
Threaded shank end mill
Faction size 1/16- 4
Number size 97-1
Letter size A-Z
Metric size0.04 to 80mm
General purpose drilling
118
Soft material
60-90
Hard material
150
Follower rest
Keeps workpiece from deflection away from cutting tool, by supporting the immediate area of cut
Gib key taper
1/8 tpf
ANSI taper
3.5 tpf
Jacob’s taper
0.591 to .979
How does the apron hand wheel move the carriage.
Rack and pinion
3 auxiliary stops
Parreles, jack screws, table stop block
Set screw to bit
Weldon
Milling machine will
Except Morris taper into spindle
Stop block
Keep work peice from shifting under high pressure
Center drill angle
60
Step drill bits
Drill and bore
Pilot hole
From 3/4 and up
Core drill
Used to enlarge hole
Power hacksaw blades compared to hand
Thicker and wider, 12-40 inch and 5/8 to 2.5 in width
Two types of power hacksaw blades
Fully hardened blades, and bimetal blades
Fully hardened blades,
These blades are good for material such as stainless steel these blades withstand heavy feed pressures for faster cutting than other types of hacksaw blades
bi-metal blades
High-speed steel tooth edge with a tough alloy steel back,
Toughness
Toughness refers to the resistance to fracture or the amount of energy a substance absorbs before it breaks
Hardness
Hardness is the ability of a material to resist penetration
Malleability
A material can be shaped or Moulded easy
Locking type pins
Quick release lock pin and spring locking pin ( hair pin)
Pratt and Whitney key
Used when a hub slides back and forth on the shaft and are usually attached with screws or buring The hub
Jam nuts
Thinner than a regular hex nut and are paired with hex nuts to lock them into position
Prevailing torque nuts
Have a deformed or crimped thread at the top of the crown that provides the locking Force against The mating thread
Flange lock nuts
Have a built-in external washer
Belt grinder
Used for polishing and grinding, the width of the belt ranges from a quarter inch to 26 in, great for quickly to buring and chamfering a work piece
Aluminum oxide
Gray, light gray and white
Silicone carbide green
Green silicone carbide wheels are used to grind cemented carbide ceramics and other hard materials
Black silicone carbide
Used to grind cast iron and non-ferrous metals, like brass copper and aluminum
Disc bonds
Vitrified, resinoid, and rubber
Vitrified
Designated by the letter v, this bond is used for 50% of all Wheels produced, it is made of clay. 6500
Resinoid
Designated by the letter b it is used for 33% of all Wheels produced, 9500 -1600 rpm
Rubber
Designated by the letter R, it is made by vulcanizing a mixture of grain crude rubber and sulfur, it’s good up to 16,000 RPM
Power load types
22 caliber 25 and 27
Power load with a crimped end
Low velocity tools
Power load identification
Number one, is gray number two, is brown number three, is green number four, is yellow number 5, is red number 6, is purple
Do you need good ventilation for operating an explosive tool
Fuck yes
What is the transverse vial on a Master precision level 4
It’s not as sensitive as the main vial it’s to see if the level is positioned correctly
Bench and Carpenters level
Good to 0.1 of a degree or .020 of an inch per foot
What grout mixtures tend to shrink
Homemade
Formula for leveling a base
X = shim reading * a/b
Types of couplings
Rigid, flexible and special purpose
Types of special shims
Step shims elastomer shims
Elastomer setup
Sandwiched between a metal shim
Horizontal moves
Positive readings are toward the datum, and negative readings are away from the datum
The four types of steel rule
Spring tempered rule, flexible rule, narrow rule, hook rule
What is a basic measurement
1/64 or 0.5 mm
Measuring tape markings
Foot/inch, metric and continuous inch and metric
Nominal size
Is the purpose of general identification
Actual size
The size after it’s being measured
Basic size
The theoretical size which tolerances are applied, basic size can refer to both mating parts
Limit of size
Limited size is the largest upper limit and the smallest lower limit a part can be and still be acceptable
Maximum metal condition
Smallest hole and largest shaft
Least metal condition
Largest hole smallest shaft
What is tolerance
Tolerance is the total amount of variation permitted in the size of duplicate parts
Limit dimension
Only maximum and minimum dimensions of the part are specified
Allowance
The intentional difference between two mating parts at maximum metal condition
Positive and negative allowances
A positive allowance is when the whole is larger than the shaft, a negative allowance the hole is smaller than the shaft
What do you need to do when dressing turning or balancing any grinding wheels
Wear a respirator or dust mask at all times
What is on a blotter wheel
Max rpm, size of wheel, type of wheel
Side wheel grinder
Same as bench and pedestal grinders except the side of the wheel is used for grinding instead of the face, usually with silicone carbide grinding wheel for sharpening carbide tool
What is a tool rest for on a grinder
It is slightly above the center, and it is to provide for resting the work piece on
What should you always do before installing a wheel on a grinder
F**** ring test it
What grit is courser on grinding wheel 46 or 60 grit
46
When would you use a diamond dresser
When a very fine finish is required
On a pedestal grinder the gap between the grinding wheel and the workrest should not exceed
1/8
What is the thread
The helical ridge that runs around the cylinder or cone
Thread profile
The view of the thread when the bolt or nut is cut in half lengthwise along its axis
Minor diameter
The smallest diameter of a screw thread, on an external thread it is measured across the root of the thread, on an internal thread it is the inside diameter
The crest
