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First of all I must warn you of the dangers bench grinders can represent. Here in Britain no one connected with a business is allowed to carry out any maintenance on any none-portable grinding machine unless they have attended and passed a course on the subject and every employer must keep a register recording what maintenance has been carried out and by whom. Grinding machines have been responsible for many industrial "accidents".
Householders and private individuals are exempt from the Law but cannot afford to be less well informed even though the five and six inch bench grinders sold to the domestic user represent a somewhat reduced risk, great care and precautions are still required, not the least of which is the use of good eye protection even if the grinder is fitted with shields.
The first problem about dressing the grinding wheel of a grinder intended for the domestic market is the tool rests are usually too small and insubstantial for the vibrating star-wheel type wheel dressing tool to be used correctly.
A demonstration would be the best way to learn how to dress a grinding wheel and there are many available on Youtube and here is a link to a particularly good video.
Finally, it is best to be aware of one little thought about problem. There is an optimum speed range when a grinding wheel works efficiently and small domestic grinders barely turn fast enough for them to be properly efficient, probably because it is reckoned price and user safety takes priority over efficiency.
The speed that is of concern is the surface or peripheral speed of the grinding surface rather than the rpm of the spindle and should that speed fall too low the wheel will not be able to operate efficiently, will become dull more quickly with a greater tendency to clog and the wheel will become hot in use and hot grinding wheels soon become dangerous.
I hope you will be able to see that by reducing the diameter of a grinding wheel by dressing it also reduces the surface speed of the grinding surface even though the spindle speed remains the same. The relationship between surface speed and spindle speed is why small grinding points need to spin at 20,000 rpm and an eight foot wheel at just a few hundred rpm - in both cases the surface speed is similar.
A domestic grinder should not be used for heavy work but as the size of the wheel is reduced it should be used only for increasingly light work and if it is desired to carry out "normal" grinding operations it would be better to replace the wheel sooner rather than later.
Locate the adjustment screws near the carburetor labeled with an "H," an
"L," and an "LA." The "H" screw adjusts the high speed fuel-air
mixture; the "L" screw adjusts the low speed fuel-air mixture; and the
"LA" screw adjusts the idle speed.
i woulkd take switch off and rewire it. It is not a very difficult thing to do. As you take it apart just pay atention to where the speed control wires are running from and go from there. If it still dosent work than the switch is burnt out
Unless the motor is a brush type universal unit, there is commonly no way to change the speed of an induction motor. There are AC motor speed control units available, but cost more than the grinder as they change the frequency as well as the voltage. There are speed controllable grinders available that use brushes so that simple electronics can control speed. Hope this helps!
All abrasives are marked with a maximum speed rating. Always check the rated speed of the tool you are mountin the abrasive on and be sure the rated speed on the wheel is equal to or higher than the rated speed of the tool. Never remove a guard to mount a larger wheel on a grinder than it is rated, even if the speed rating is ok!
The RPM rating of the die grinder is the deciding factor in the tool’s usage. A die grinder with a lower RPM is best used for fine grinding and finishing work. Speeds lower than 10,000 RPM are best for this function. A die grinder with an RPM between 10,000 and 20,000 is great for creating rough finishes and minor buffing jobs. If the die grinder will be used to remove metal burrs or to cut metal, it must have an RPM rating of over 20,000 and a no-load speed of at least 30,000 depending on the RPM rating.