wheel bearing
A grinding machine uses an abrasive wheel to final machine precision components to fine tolerances ,it is possible to achieve accuracy down to less than .001mm.There are 3 general types of grinding machine,Internal which machines bores,external which grinds outside diameters.and surface which grinds flat surfaces on components.There are other types of specialized grinding machine like gear/spline grinders etc . The grinding wheel rotates at high speed and is "dressed/trued up" by passing an industrial diamond over its surface. The wheel is then bought into contact with the work piece which will also be rotating when internal or external grinding or moving from left to right beneath the wheel when surface grinding.The work piece is now moved accross the face of the wheel to remove fine amounts of material until the required size is reached. Ther are many factors to take into account when grinding.ie type or grade of wheel used,rotational speed of wheel,speed of work piece,speed that wheel is moved/traversed accross workpiece.The way the wheel is dressed/trued up will affect how it cuts, and the surface finish achieved.
Creepfeed grinding is a grinding process that can, in most cases, be used as an alternative to reciprocating surface grinding. The main difference is: Reciprocating grinding - the machine table speed is fast (800-1600"/min), and the grinding wheel infeed amount is very small (0.0002-0.002"/pass). ie removing small amounts of material while the table moves quickly back and forth. Creepfeed grinding-the machine table speed is slow (2-50"/min), and the grinding wheel infeed amount is high (up to .25"/pass). ie removing a large amount of material in one (or a few) slow pass. Creepfeed grinders generally require: high rigidity, full machine enclosure, high horsepower spindle drive, high volume/pressure coolant
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Creepfeed grinding is a grinding process that can, in most cases, be used as an alternative to reciprocating surface grinding. The main difference is: Reciprocating grinding - the machine table speed is fast (800-1600"/min), and the grinding wheel infeed amount is very small (0.0002-0.002"/pass). ie removing small amounts of material while the table moves quickly back and forth. Creepfeed grinding-the machine table speed is slow (2-50"/min), and the grinding wheel infeed amount is high (up to .25"/pass). ie removing a large amount of material in one (or a few) slow pass. Creepfeed grinders generally require: high rigidity, full machine enclosure, high horsepower spindle drive, high volume/pressure coolant
lower ball joints need lubed up or probably replaced.
minimum wind speed is 15km/s but when high speed of wind rotates the blade of windmill .it rotates fasteer than before .so the energy is change
High speed vibration is often an indication of a wheel that is out of balance or a bent rim. It can also be a bent driveshaft or bad U-joint. Vibration when you brake at high speed is almost always a warped rotor on the disk brakes.
Without more detail, my first guess would be that you have worn down your break pad to the metal on the side that is grinding. What your hearing is the metal from the pad grinding on the rotor. If this is the case then you may hear it get worse when you apply pressure to the breaks. You will want to replace the pads on "both" sides of the car and you might need to replace the rotor or have the rotor turned that is on the grinding sound side ASAP.
It could be a shifted belt in one of the tires.
It is the sound of the gears grinding against each other. Because it is at a high speed, it sounds like a rattling instead of a grinding.
Nitrogen is not always used in tubeless tyres, but it is quite common to use nitrogen to fill tyres from race cars, this is because nitrogen is lighter than air, therefore creating less centrifugal force when the wheel rotates at high speed.