When it works it works good.
A grinder that growls when you start it usually means the bearings are worn out or very dry. You can try a little WD40 spray in the bearing area and if that seems to work use some heavier oil to keep it running. It's good to oil the bearings every so often I find.
SOURCE: Bench Grinders Safety issues
Goggles or safety glasses need to be worn to protect the operator's eyes from the sparks and metal filings that result. Depending on the workpiece and time of exposure, hearing protection may also be required, the dust produced is also potentially hazardous. The toolrest (or workrest) should be mounted slightly below the center of the grinding wheel with less than 3 mm clearance from the wheel. This prevents the work from jamming between the toolrest and the wheel. Grinding wheels designed for steel should not be used for grinding softer metals, like aluminium. The soft metal gets lodged in the pores of the wheel and expand with the heat of grinding. This can dislodge pieces of the grinding wheel. Wire brushes require particular attention for the safety of the operator and bystanders as the metal wires may become dangerous projectiles as they could bind with the object being brushed and so throw it away with great energy. The machine needs to be securely mounted to a pillar or a bench to be used safely and effectively, often with an emergency stop switch or pedal fitted close by the machine, for use in emergencies.
SOURCE: delta 23-880 bench grinder
You should be able to hold the grinding wheel with a pair of leather gloves on your hands and lossen the bolt. Look very carefully at the threads to make sure you are trying to lossen and not tighten. Some are left handed threads on bench grinders.
SOURCE: older black & decker bench grinder
Usually a new wire wheel comes with different size bushing just for the problem you are describing. Either that or take it back and get one specifically for your tool.
SOURCE: I need a wiring diagram for a Craftsman 6
Go to;
http://www.searspartsdirect.com/partsdirect/getSubComp.pd?modelNumber=152.211521&productCategoryId=0721100&brandId=0247&modelName=GRINDER&diagramPageId=00001&documentId=P0410025&pop=flush
and click on "View full size" at the top.
SOURCE: NEED ON/OFF SWITCH FOR BUFFALO BENCH GRINDER
You can get a replacement toggle switch at any hardware store look in the electrical department.
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