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G8220 Wet/Dry Bench Grinder -11-
SECTION 5: Operations
The dry wheel supplied with the G8220 is an 80
grit Aluminum Oxide wheel good for heavy mate-
rial removal and for roughing in to approximate
dimensions. The wet wheel is a very fine 1000
grit which, along with the water supply, allows
fine grinding and honing to very precise edges.
Choose the wheel and grinding method appro-
priate for your grinding needs.
naturally generated during the grinding process.
Secondly, the water acts as a lubricant for the
grinding process improving the cutting character-
istics of the fine grit wheel. As you begin grinding,
adjust the water flow so there is a steady drip
onto the surface of the wheel, close to the inner
edge. Make sure the drain pipe coming out the
underside of the water tray is directed so it is
going into some type of container.
Plug the machine in and turn the motor on. Allow
the wheel to get up to full operating speed before
beginning the grind. Introduce the item to the
wheel slowly and carefully, making sure it is fully
supported against the tool rest and miter gauge.
For some types of grinds, it may be necessary to
sweep the item across the wheel surface by slid-
ing the tool rest across the holder. Always lift the
item off the surface when returning to the starting
point of the sweep. Do not let the workpiece get
too hot during grinding. If heat is increasing, slow
down the rate of grind, or turn up the water flow.
High heat will destroy the temper of the metal
and will make it impossible to hold an edge.
Use extreme caution when sharpening any
type of knife, both during and after sharp-
ening. Make certain the knife is fully sup-
ported by the rest before bringing it into
contact with the wheel. Failure to exercise
care while working near knives could result
in severe injury.
Overview
Wet Wheel Grinding
There are three adjustments necessary to get the
proper grinding angle. Tool rest height, tool rest
angle, and miter gauge angle must all be adjust-
ed to get the proper angle of attack on the grind-
ing wheel. Be sure the machine is off and
unplugged. Lay the item to be ground on the rest
and lay it against the stationary wheel. Adjust all
three elements until the blade contacts the wheel
in the proper orientation. A typical set up for a
bevel tip chisel is shown in Figure 6.
The water reservoir allows the operator to drip
water onto the wheel during the grinding process.
The water serves two purposes. One is to provide
a certain amount of cooling for the heat which is
Figure 6. Typical wet wheel grinding operation.