unit 1,5,6,,7,8 Flashcards
two types of arbor presses
hydralic and mechanical
bushings should be lubricated with high pressure lube before pressed into a bore no oil
true
the bore should always have a ?
chamfer
when working with bolster plate minimum pressure otherwise damage will be done
true
keyseat:
it is helpful to chamfer the leading end so it aligns
the mandrel is tapered about?
0.006 inch per ft
broaching atleast 2 or 3 have to be in contact
true
two important things in broaching
alignment and lubrication
never use a broach on material
harder then rockwell c35
most common tapers
morse taper and taper pin reamers
morse taper is
5/8 inch
dies are made in
1 1/2 inch
button dies are used in diestock for hand threading or in a machine holder for machine threading
true
collets are held securly in die stocks by a
knurled screw that seats in a dimple cap
hand threading needs
cutting oil or other threading fluids are important obtaining quality threads and long life
go gauge should on the thread
no go will not go more then 1 1/2 turns
a lathe can be used as a fixture
for cutting threads with a die
it is good practice to chamfer
the end of the workpeice before cutting a die
when cutting threads with a hand die
reverse rotation after each full turn to break chips
die is used to cut
external threads
dies are made from
high speed steel
button dies are made in diameter
of 1 1/2 inch and pipe of 1.2 inch
collets are held securley in diestocks
by a knurled screw that seats in a dimple cap
hexagon rethreading dies are used for
fixing slightly damaged or rusty threads
cutting oil or other threading fluids are
used in obtaining good thread
outside material to be threaded is 0.002 to 0.005 inch
true
when cutting threads with a hand die
reverse the die after full turn to break the chips
tap drill charts usually give ntap drill sizes to
75 perfecnt thread
rule of thumb is to have a bolt engage a tapped hole by 1 to 1 1/2 times it diameter
true
dull taps produce
rough torn or offsize threads
lubrication is one of the most important factors in tapping process
true
turn tap clockwise one quater to one half turn then it back three quater of a turn to break chips
true
taps are used to interna; threads in holes
true
the active cutting part of the tap is
chamfer
what are common taps 2,3,4 are common
true
the # 1 tap has smaller major and pitch diameter and is used for rough cutting threads
trueq
2 taps cut the thread slighty deeper
true
3 tap finishes it size
true
serial taps are for
tapping tough metals by hand such as stainless steel
spiral points taps
can be operated at high speeds and require less torque to drive
spiral fluted taps are used for tapping blinds holes
in ductile material such as aluminum magnesium brass copper and die cast
tapered tap pipe taper is
3/4 inch per foot for pipes
reducing friction with taps
liquid nitride produces a hard shallow surface
oxide treatments prevent
chips from welding to the tool and reduce friction between the tool and work
chrome plating is
effective on non ferrous and some soft steels
hand reamers are designed to remove small ammounts of material
usally 0.001 to 0.005 inch
hand reamers are made from
high speed steel
hand reamers are back tapered
0.0005 to 0.001 inch
3 types of hand reamers
morse taper, straight flute and helicial flute hand reamer
the three hand taps in a set
taper, plug and bottoming
if a high speed steel hand tap breaks one way to remove it is
with an eleltric discharge machine
choose the correct tool to turn a die
die handle
the cuttion action of a hand broach is preformed by a series of succesive teeth each protruding
0.003 inch further then proceding tooth
pullers are used
to remove bearings hubs and sprockets
when using a puller or press and removing a bearing from a shaft what would you do
before removing a bearing or hub from a shaft puller inspect and clean the shaft area
the perfered stock allowance for hand reaming is between 0.001 to 0.005 inch
true
