The variable speed angle grinder is a versatile tool that is present in every metal shop.
There are some grinders that can turn at extremely high rpm's but this is only ideal for cutting.
This high speed is not always the optimum level of performance that is need when using a grinder.
With a tool that has variable speeds it can function at, the versatility of the tool increases.
Polishing and sanding are mainly for finishing work of a metal's surface.
This is when a slower speed is needed.
If the speed is too fast, the finish can be adversely effected.
This can be seen when an angle grinder is fitted with a polishing pad.
If not done correctly or is at too high of a speed, the paint on the surface of metal can be burnt.
A good angle grinder that is variable in speed can turn as slow as 2500 rpm's while still being capable of reaching a top speed of 11000 rpm's.
This makes it ideal for jobs from polishing to cutting and all types of grinding needs in between.
Many users are always prepared for the sudden disc jamming while a grinder is being used, but this situation is also dangerous.
The better angle grinders have a kickback shut off to help prevent any injury in situations like disc binding occur.
There are two different types of switches for choosing the speed that is desired.
The set switch that will turn your grinder at a preset speed and the sliding switch in which the user has more control over the speed but are harder to reproduce from use to use.
The right variable speed angle grinder for your specific needs will be determined by the way you need to use it and the job at hand.