CLASSIFICATION OF GRINDER II (grinding mill)
Jig grinder
A jig grinder(grinding mill) is a machine tool used for grinding complex shapes and holes where the highest degrees of accuracy and finish are required.
The
jig grinder is very similar to a jig borer, in that the table
positioning and spindles are very accurate (far more so than a manual
milling machine or lathe). It is almost exclusively used by tool and die
makers in the creation of jigs or mating holes and pegs on dies. There
are usually many peripheral elements to a large jig grinder, including
separate hydraulic motors, air compressors, and various cooling systems
for both the hydraulic circuit and supplying coolant to the work and
machine itself.
The machine operates by a high speed air spindle
rotating a grinding bit. The air spindles are removable and
interchangeable to achieve varying surface speeds. Some spindles are
fixed speed (60000 rpm), others are adjustable (30000-50000 rpm), and
still others are very high speed (175000 rpm). The machines have a
standard X-Y table with the notable exception of knee travel. All axes
are indexed to .0001" via a vernier scale on the handwheels, with higher
accuracy available with the use of measuring bars. The machine head has
two vertical travels, one rough head adjustment and the other a precise
spindle adjustment. The spindle to which the detachable air spindle
mounts also rotates at a variable speed and can typically outfeed .100"
while running, again with an accuracy of .0001" on the handwheel or
greater, for very precise hole, peg and surface grinding. A well-kept
jig grinder will reliably position work to a higher degree of accuracy
than is possible with handwheels alone. These features are all critical
in positioning a hole and peg system a precise distance from a reference
surface or edge.
The most important factor on a jig grinder is the
dual-spindle configuration. The main spindle is roughly positioned with
between 1" or 2" of travel for setup, and then the .100" of outfeed is
used during machine operation to outfeed into the work. A spacer bar may
be used between the grinder and main spindle, allowing large (9" radius
or larger) work to be completed. The main spindle has a wide range of
speeds to ensure proper grinder feed rates are maintained.
Grinders (footwear)(grinding mill)
Grinders
is a footwear line established in 1965 in the United Kingdom. Famous
for their air cushion sole and leather footwear for both men and women,
Grinders have become one of the leading "Street Fashion Footwear" brands
from the United Kingdom. Utilising some of the best craftsmen in
England, Grinders are renowned for welted sole footwear. The sole unit,
which is patented to Grinders, is heat sealed to the welt, giving the
Grinder footwear range the strength and lasting durability of the
Goodyear welt process. The unique air cushion sole enables flexibility
and ensures guaranteed long lasting quality to every pair.
Grinders
brand boots and shoes have been particularly popular in the UK and
eastern Europe, especially among certain subcultures, such as rivetheads
and skinheads. Famous musicians who have worn Grinders boots include
members of Guns N' Roses, The Prodigy, Funeral Dress and E-17. Like Dr.
Martens, Grinders are now made in China unless you buy them from the
British Boot Co who have them made especially in Northamptonshire so the
Grinder can retain the Made in England stamp.
Wet grinder(grinding mill)
Wet
grinders are very popular tools in the South Indian kitchen used to
make paste out of soaked grains and lentils. At one time, a wet grinder
consisted of a large rock with a pit in it, where a cylindrical rock
with a wooden handle fit in. The grain or lentil was poured in with
water and the cylinder rotated by the handle on the top to grind it in
to paste or batter. The ground paste is used for various food items like
idli, dosa, sevai and vada. The evolution of grinders have a dramatic
change in the working. The earlier form of wet grinder called "Attu
Kallu" used mechanical energy in which the user has to rotate the top
stone called "Kullavi" to grind the medium. The invention of electricity
has led to the development of electric-powered wet grinders. Mr.
Krishnamurthy of Lakshmi Grinders revolutionized the grinders by fitting
the motor to it and made it automatic. In his version, the kulavi was
connected to the motor. These grinders were used by home based
businesses or restaurants only. People took their rice or other grains
to these home businesses and got them ground.
The next revolution of
the grinders was made possible by Mr. Duraisamy of Santha Grinders. He
was thinking about making the grinders compact and more user friendly.
He replaced the single kulavi (which was heavy and too cumbersome to
clean) with two smaller roller stones. The first model he made worked
well except that it was splashing the dough out the grinding vessel. He
was thinking hard and one day, he noticed the roller on the water well
retaining the water when people drew water. He got the idea and made the
roller stones with grooves that kept the dough contained within the
vessel and gave good results. Also in his version, the drum was
connected to the motor and it rotated.
The next big revolution was
created by Mr. L. Varadarajulu of ELGI Ultra grinders. He was thinking
why the grinder has to be so bulky and needs a man to clean it. He came
up with the Ultra Grind+ grinders where the drum was detachable and the
stones were light weight women could handle it easily.
Now Coimbatore
is the hub for the wetgrinders and 95% of the wetgrinders made in India
are made there. These grinders are also exported to all over the world.
In
the original stone grinder, there were dips and bumps and the grains
were ground by crushing action. By constant use, the spots where the
kulavi meets the attukkal became smooth. This reduced the efficiency of
the grinder. One had to hire a person to resurface the stone with chisel
and hammer (they came to people's houses and worked on the attukkal as
it was too heavy to be transported).
Now the grinders have smooth
bottom stone and smooth roller stones. The grains are ground by shearing
action or crushing action depending on the manufacturer. And these
grinders do not need any resurfacing.
Grinder's Stand(grinding mill)
Grinder's
Stand was the stand, or inn, located on the historic Natchez Trace
where Meriwether Lewis died. A replica can be visited today at the
Meriwether Lewis Park, located on the Natchez Trace Parkway south of
Nashville, southwest of Columbia, and east of Hohenwald, Tennessee.
The
tavern is believed to have been established in 1807. Its proprietors
were Robert Evans Grinder and Priscilla Knight Grinder. The original
stand consisted of two rough log cabins adjoined at right angles with a
dogtrot between them. Both rooms had doors facing the Natchez Trace; one
room also had a door facing the dis-joined kitchen behind the stand. A
barn and stable were also located on the property, although the original
locations of these two buildings have not been discovered.
According
to tradition, Robert Grinder sold whiskey to the Indians, whose lands
came within a few feet of the cabin. The proper use of the stand was to
provide food and lodging to the travellers of the Natchez Trace.
In
the 1930s, the Civilian Conservation Corps built a replica cabin less
than twenty feet from the remains of the original stand. The current
cabin does not authentically match the design of the original.
Surface grinder
A
surface grinder is a machine tool used to provide precision ground
surfaces, either to a critical size or for the surface finish.The
typical precision of a surface grinder depends on the type and usage,
however +/- 0.002 mm (+/- 0.0001") should be achievable on most surface
grinders.
The machine consists of a table that traverses both
longitudinally and across the face of the wheel. The longitudinal feed
is usually powered by hydraulics, as may the cross feed, however any
mixture of hand, electrical or hydraulic may be used depending on the
ultimate usage of the machine (ie: production, workshop, cost). The
grinding wheel rotates in the spindle head and is also adjustable for
height, by any of the methods described previously. Modern surface
grinders are semi-automated, depth of cut and spark-out may be preset as
to the number of passes and once setup the machining process requires
very little operator intervention.
Spark out is a term used when
precision values are sought and literally means "until the sparks are
out (no more)". It involves passing the workpiece under the wheel,
without resetting the depth of cut, more than once and generally
multiple times. This ensures that any inconsistencies in the machine or
workpiece are eliminated.
As with any grinding operation, the
condition of the wheel is extremely important. Diamond dressers are used
to maintain the condition of the wheel, these may be table mounted or
as the first image shows, mounted in the wheel head where they can be
readily applied.
The machine has provision for the application of coolant as well as the extraction of metal dust (metal and grinding particles).
Depending
on the workpiece material, the work is generally held by the use of a
magnetic chuck. This may be either an electromagnetic chuck or a
manually operated, both types are shown in the first image.
Flick grinder
A
flick-grinder is a rough and ready surface grinder or tool and cutter
grinder, its usage is varied but it may be used where great accuracy is
not required, but a machine better than a bench grinder is required.
Besides
the grinding wheel, the machine is hand powered on all axis. The
machine may be used to cut die punches to length or to perform grinding
operations such as grinding flats or other shapes on punches etc.
Cylindrical Grinder(grinding mill)
Cylindrical grinder is a class of grinding machines used on the work pieces that are symmetrical about an axis of rotation
Types of Cylindrical Grinder
OD grinder
An
OD grinder grinds the outer diameter (OD) of the work piece, held on
one or both ends. Usually, the work piece is held between centers or
chucked and rotated against a faster spinning grinding wheel,great care
should be taken as the OD comes closer to finished size as its too easy
to over grind the tool.
ID grinder
An ID grinder grinds the inside
diameter (ID) of a work piece but usually this tends to be a longer
process than OD grinding as the ID grinding stone is smaller and
requires the operator to make smaller cuts from the tool to ensure that
the ID grind is perfect and to the correct size.
Centerless grinder
A
centerless grinder is a type of OD grinder where the workpiece, rather
than being supported on either end, is held against the grinding wheel
by a second smaller wheel, turning at a slower RPM and known as a
regulating wheel, while resting on a workblade.
Bench grinder
A bench grinder or pedestal grinder is a machine used to drive an abrasive wheel (or wheels).
Depending
on the grade of the grinding wheel it may be used for sharpening
cutting tools such as lathe tools or drill bits. Alternatively it may be
used to roughly shape metal prior to welding or fitting.
A Wire brush wheel or buffing wheels can be interchanged with the grinding wheels in order to clean or polish work-pieces.
Organ grinder
The
organ grinder was a musical novelty street performer of the 19th
century and the early part of the 20th century, and refers to the
operator of a street organ.
Period literature often represents the
grinder as a gentleman of ill repute or as an unfortunate representative
of the lower classes. Newspaper reporters would sometimes describe them
cynically or jocularly as minor extortionists who were paid to keep
silent, given the repetitious nature of the music. Later depictions
would stress the romantic or picturesque aspects of the activity.
Whereas some organ grinders were itinerants or vagabonds, many were
recent immigrants who chose to be street performers in order to support
their families. Those who actually owned their barrel organs were more
likely to take care of them and pursue the "profession" more seriously. A
few organ grinders still remain, perhaps most famously Joe Bush in the
United States.
Angle grinder
An angle grinder is a handheld power tool used for cutting, grinding and polishing.
Angle
grinders can be powered by an electric motor, petrol engine or
compressed air. The motor drives a geared head at a right-angle on which
is mounted an abrasive disc that can be renewed when worn. Angle
grinders typically have an adjustable guard and a side-handle for
two-handed operation.
Angle grinders may be used both for removing
excess material off a piece or simply cutting into a piece. There are
myriad different kinds of discs that are used for various materials and
tasks, such as cut-off discs (diamond blade), abrasive grinding discs,
grinding stones, sanding discs, wire brush wheels and polishing pads.
The angle grinder has large bearings to counter side forces generated
during cutting, unlike a power drill, where the force is axial.
Angle
grinders are widely used in metalworking and construction, as well as
in emergency rescues. They are commonly found in workshops, service
garages and auto body repair shops. There is a large variety of angle
grinders to choose from when trying to find the right one for the job.
The most important factors in choosing the right grinder are the disc
size and how powerful the motor is. Other factors include power source
(pneumatic or electric), rpm's, and arbor size. Generally disc size and
power increase together. Disc size is usually measured in inches. Common
disc sizes for angle grinders include 4, 4.5, 5, 6, 7, 9 and 12 inches.
Discs for pneumatic grinders also come much smaller. Pneumatic grinders
are generally used for lighter duty jobs where more precision is
required. This is likely because pneumatic grinders can be small yet
remain powerful, while it is harder for an electric grinder to maintain
adequate power with smaller size. Electric grinders are more commonly
used for larger, heavy duty jobs. There are also small electric grinders
and large pneumatic grinders.
Meat grinder
A meat grinder or meat
mincer is a culinary tool for grinding meat. Several varieties of the
tool are available, although most people conjure the image of a
hand-powered grinder which is cranked.
Most meat grinders function by forcing the meat against and through small holes as it is cut. They can be run on electricity.
grinding mill machine for industrial.
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CLASSIFICATION OF GRINDER II (grinding mill)
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