Abrasives

Question 1

Abrasive machining

Answer 1

using abrasive material to remove material at high cutting spped and shallow doc

Question 2

abrasives can be

Answer 2

mounted
free
close packed

Question 3

how is the steel workpiece held for a grinding wheel work

Answer 3

steel workpiece attached to table via magnetic chuck

Question 4

what amaterials can be abrasives be made og

Answer 4

sandstone
emery
quartz
diamond

Question 5

size of abrasive controls what

Answer 5

how much material is removed and the surface finish

Question 6

large grain size

Answer 6

more removal at less time but at cost of SF

Question 7

Grit geometry

Answer 7

abrasive grains are not uniformly shaped nor uniformly distributed. the surface is designed for the average distribution.

Question 8

in abrasives what can chips of abrasives do

Answer 8

cut
rub
plow

Question 9

negative rake angle may cause what?

Answer 9

more plow than cut

Question 10

cutting rubbing plowing usually depend on

Answer 10

the size of that tooth and orientation

Question 11

grinding wheel, truing dressing

Answer 11

as grinding wheels work they eventually start loosing shape and the diameter gets smaller, truing will restore the geometry and dressing will remove the lodged chips

Question 12

crush dressing

Answer 12

will constantly run against grind wheel while its working and make sure it maintains its shape

Question 13

grinding wheel operational parameters

Answer 13

grinding wheel balance
can cause vibration which will cause losing balance and eventually breaking - truing!
grinding safety
using fluid

Question 14

types of grinding: surface grinding

Answer 14

grinding flat workpieces
two forms of cutting: conventional and creep feed

Question 15

conventional and creep feed surface grinding

Answer 15

conventional: harder wheel and will have a high cutting speed and make many passes
will retain the shape of the wheel longer and is slow

creep feed grinding:
softer wheels and abrades itself faster but there is a crush dresser takes large DOC at low feed rates
wheres out fast yet dresser maintains needed doc

Question 16

type of grinding: cutting off

Answer 16

for slicing/slotting parts

Question 17

centered cylindrical grinding

Answer 17

grinds outside dia of the cylindrical workpice

workpiece is mounted and rotated on a longitudinal axis

grind wheel on same axis but opposite direction

Question 18

non centered cylinidrical grinding

Answer 18

piece can be ground internally or externally

work piece between two wheels a grinding wheel and a speed regulating wheel

Question 20

advantages and diasdvantages of noncentered grinding

Answer 20

adv:
rapid
little operator skill
heavy cuts can be made

diasdv:
special machines that cant do any other work
work must be round

Question 21

tool grinding

Answer 21

mill cutters reamers, and single point tools all require sophisticated grinding porvided by a tool grinder that differs from a universal cylindrical center type grinding

headstock can move vert and horz
wheel head can be raised and lowered and rotate about the vertical
tabe motions are manual

Question 22

give me 2 other grinding tools

Answer 22

mounted wheel/points to finish work

coated abrasives such as sheets and disks and belts

Question 23

honing and superfinishing

Answer 23

removes small amount of material and produce desired surface finish

like honing but typically on a flat surface

Question 24

lapping

Answer 24

where abrasive media is embedded into a softer material calleld lap
removes material very slow

Question 25

types of free grinding

Answer 25

waterjet cutting
ultrasoning
air jet cuttinf
abrasive water jet cutting