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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.
The danger of using a grinder single handed is that if the disk catches in the workpiece, the grinder will try to pull out of your hand and you can loose control of it and risk possible injury or damage what you are working on. This is especially dangerous if you are working off a ladder or on a height as you could loose your balance. When using an angle grinder you should always wear eye protection and try to keep your head to one side out of the plane of the disk avoiding sparks and possible fragments of the disk which will fly at high speed if it shatters.
Check with fresh batteries.. Did you sync the mouse with transciever? Push tiny button on transceiver, (maybe hold for few seconds) light flashes quickly.. then push tiny button under the mouse, light stops flashing. Try few times, maybe otherway round. If still not work consider defective.
In order to remove the glass you will need to lift the top of the grinder off. To do that is a rather complicated procedure however and I would recomend that you have a repair service come to remove the glass. Attempting to do it yourself could damage the inside of the grinder and possibly make your dishwasher not work at all.
Caffeind...the problem is likely still some bean remnants stuck in a switch which is causing the problem. Get some newspaper and open it up on a flat surface. Invert the grinder and give it a couple of thumps on the newspaper. The chips should loosen up and fix it. Remember, beans are both sharp in shape and oily in makeup...perfect for getting stuck.