Inspect the machine and its guards
. Check the machine’s speed with a tachometer before mounting grinding wheels. NEVER USE A DAMAGED MACHINE. Clean arbor and flanges before mounting a grinding wheel.
What operation should be performed to a grinding wheel before mounting and why?
Grinding wheels must be
inspected and “ring-tested”
before they are mounted to ensure that they are free from cracks or other defects. Wheels should be tapped gently with a light, nonmetallic instrument. A stable and undamaged wheel will give a clear metallic tone or “ring.”
Why wheel balancing should be done before mounting the grinding wheel?
Wheel Balance:
Out-of balance and out-of-round wheels result
in vibrations and poor surface finish
, faster wheel breakdown and sometimes even cause injury to the operator. For this the wheel is mounted at the centre of a perfectly straight and round spindle, the assembly is then rested on level knife-edge ways.
What should every grinding wheel have to prevent cracking when mounting?
OSHA requires that
grinding wheels be ring tested before
mounting them. This simple step prevents the inadvertent mounting of a cracked grinding wheel. Ring-Testing involves suspending the grinding wheel by its center hole, then tapping the side of the wheel with a non-metallic object.
What should be done before mounting an abrasive grinder wheel to ensure that it is free from cracks or other defects?
All abrasive wheels shall
be closely inspected and ring-tested
before mounting to ensure that they are free from cracks or defects. Grinding wheels shall fit freely on the spindle and shall not be forced on. The spindle nut shall be tightened only enough to hold the wheel in place.
How a grinding wheel is marked?
The type of the wheel is marked as an ISO number and
signifies the wheel’s shape
. For example, ISO Type 52 is a spindle-mounted wheel. The size of the grinding wheel is marked as dimensions in mm. … This represents the wheel’s diameter x thickness x hole size.
What are the points to be inspected when mounting a wheel?
Pay attention to the coating when mounting a wheel, ensuring that
there are no cracks in the finish or rust underneath it
. After making sure all mounting surfaces are clean, you should look for damage, including any bending or irregularities in the bead seat or flange wear and corrosion. Also, check the disc wheel.
What is the process of balancing a grinding wheel?
The balancer is a system that controls the
intensity of the vibrations
on the grinding wheel to automatically compensate for any imbalances and improve the quality of the parts produced, specifically the surface finish (roughness) and geometry (ovality and trilobate form).
What is mounting of grinding wheel?
Proper steps in mounting a grinding wheel are as follows:
Handle and store grinding wheels in a careful manner
. … Check the machine speed against the maximum operating speed of the grinding wheel. The speed of the grinding wheel must be equal to or greater than the machine’s speed. NEVER OVERSPEED A GRINDING WHEEL.
What materials Cannot be ground on a grinding wheel?
Don’t jam the work into the wheel. Don’t grind material for which the wheel is not designed. Do not grind/
sand wood, plastic
, or any other non-metallic materials.
Do not use a grinding wheel that is?
Do not tighten the mounting nut excessively. Do not put the grinder on the floor or working surface until the wheel has stopped turning. Do not use a wheel
with a maximum RPM that is lower than the RPM rating of the grinder
. Do not keep any materials close to the grinding wheel when it is not in use.
What are the main components of grinding wheel?
The Three Elements of Grinding Wheel
A grinding wheel consists of three elements:
abrasive grain, bond and pore
, as shown in figure 1. As the wheel turns in high speed, its innumerable grains quickly grind workpiece to beautiful finish and precise measurement. This process is called grinding process.
What is the material called that holds the abrasive wheel together?
The wheels are generally made with
composite material
. This consists of coarse-particle aggregate pressed and bonded together by a cementing matrix (called the bond in grinding wheel terminology) to form a solid, circular shape.
What happens when grinding a wheel is chosen with a bond strength that is too hard?
The firmer the grip the harder the grinding wheel will be. What happens to grinding wheels with hard or very hard grades after prolonged use.
They will eventually become dull and the wheel takes on a glazed appearance
.
