hand tools Flashcards
study
pullers are typically used to remove?
hubs
bearings
sprocket
couplings
4 general types of pullers?
pressure screw puller
hydraulic puller
slide hammer puller
bar-style pullers
what does a pressure screw puller do?
to remove a bearing that is located in front of a gear
what’s does a slide hammer do?
to remove a bearing or seal internally
what does a hydraulic puller do?
to remove a flat belt pulley
what does a bar-style puller do?
uses rods that connect to some type of attachment
what does most of the cutting on taps?
taper and chamfer
what are the three hand taps?
bottoming
plug
taper
what is pitch
the distance from a point on a screw thread to a corresponding point on the next thread
tolerance definition
total permissible variation represented by the given maximum and minimum size of the part
allowance definition
an internationally agreed difference in the dimensions of mating parts
most fasteners have what degree thread angle
60
helix definition
the angle formed by the helix of slope of the thread relative to the thread axis
3 main classes of fit
class 1-loose (maximum looseness in mating threads)
class 2- average fit (most common)
class 3- tight (no looseness in mating threads)
UNC
united national coarse
UNF
united national fine
UNEF
united national extra fine
UNS
united national special
bolts, nuts and caps are classified in what three ways?
tensile strength
design
size and thread pitch
what is tensile strength
is the ability of material to resist forces that tend to pull apart
two types of cleaning
chemical
mechanical
alkaline cleaning must only be used on what
iron
what is charged in lapping
the lap
another name for scotch-rite pads
hand pads and rolls
hand reamers must be rotated
clockwise
tap drills are what percent of full thread in the hole
70
what is a port power
a hydraulic jack with a separate pump
what is a bottle jack
a hydraulic jack with a pump built in
4 parts of a hydraulic press
ram
table elevating handle
table support pins
pump with pressure gauge
what petroleum based products are used in a cold tank
kerosene and varsol
mechanical cleaning
method of cleaning by disturbing the surface of the component to remove things like paint, scale and rust
barrel finishing
is inexpensive any parts can be completed at once
how much material is removed by lapping
0.0005 in (0.01mm)
serial taps are used for what
cut difficult-to-tap materials by hand
national pipe per thread
to connect pipe fittings usually from 1/16 to 2 1/2 inch nominal pipe sizes
one way to remove a high speed hand tap if it breaks
electrical discharge machine
3 types of threading dies
adjustable split die
adjustable screw plate die
solid die
4 types of hand reamers
solid reamer
expansion reamer
adjustable reamer
taper reamer
expansion hand reamer
gives small amount of expansion by having a split body with a tapered bore
adjustable hand reamer
adjustment is achieved by backing off one adjusting nut on the reamer body and tightening the other
taper hand reamers
used to produce a standard tier hole that is both accurate and smooth
taper pin reamers
used to size the hole for taper pins
morse
used to hand ream a drilled hole to a standard morse taper
5 parts of a hand reamer
square end
shank
neck
body
starting taper
broaching
used originally for cutting keyways and splines
now used to produce all kinds of shapes
fine thread is stronger because why?
leaves more material behind
1 inch shaft equals what size key
1/4
what type of tap is used to produce threads all the way to the bottom
bottoming plug
dowel pins are used for what
aligning two machinery parts
hand reamers are available in what sizes
1/4 to 3 inch
taper pins have a taper of what
1/4 inch per foot
morace tapers have a taper of what
5/8 inch per foot
most reamers have staggered spacing on teeth because?
to reduce chatter and harmonic
