Calculating Spindle Speed For Drilling - Grizzly G0779 Owner's Manual

Calculating Spindle Speed for Drilling

Using the Drilling Speed Chart
The chart shown in Figure 24 is intended as
a guide only. Always follow the manufacturer's
speed recommendations if provided with your
drill bits, cutters, or hole saws. Exceeding the
recommended speeds may be dangerous to the
operator.
The speeds shown here are intended to get you
started. The optimum speed will always depend
on various factors, including tool diameter, drilling
pressure, material hardness, material quality, and
desired finish.
Often, when drilling materials other than wood,
some type of lubrication is necessary.
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Lubrication Suggestions
Wood ...........................................................None
Plastics ............................................Soapy Water
Brass ...............................Water-Based Lubricant
Aluminum ..................... Paraffin-Based Lubricant
Mild Steel ............................. Oil-Based Lubricant
Larger bits turning at slower speeds tend
to grab the workpiece aggressively. This
can result in the operator's hand being
pulled into the bit or the workpiece being
thrown with great force. Always clamp the
workpiece to the table to prevent injuries.
Figure 24. Drilling speed chart.
Model G0779 (Mfd. Since 09/14)