Grizzly G0794 User Manual
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Model G7943/G7944 (Mfg. 10/02+)
Choosing Speeds
Twist/Brad Point Drill Bits
Soft Wood
Hard Wood
Plastic
Brass
Aluminum
Mild Steel
1/16" – 3/16"
3000
2500
2500
2500
3000
2500
13/64" – 3/8"
2000
1500
2000
1250
2500
1250
25/64" – 5/8"
1500
750
1500
750
1500
600
11/16" – 1"
750
500
1000
400
1000
350
Spade/Forstner Bits
Soft Wood
Hard Wood
Plastic
Brass
Aluminum
Mild Steel
1/4" – 1/2"
2000
1500
9/16" – 1"
1500
1250
1-1/8" – 1-7/8"
1000
750
2–3"
500
350
Hole Saws
Soft Wood
Hard Wood
Plastic
Brass
Aluminum
Mild Steel
1/2" – 7/8"
500
500
600
600
600
500
1" – 1-7/8"
400
400
500
500
500
400
2" – 2-7/8"
300
300
400
400
400
300
3" – 3-7/8"
200
200
300
300
300
200
4" – 5"
100
100
200
200
200
100
Rosette Cutters
Soft Wood
Hard Wood
Plastic
Brass
Aluminum
Mild Steel
Carbide Insert Type
350
250
One-Piece Type
1800
500
Tenon/Plug Cutters
Soft Wood
Hard Wood
Plastic
Brass
Aluminum
Mild Steel
3/8" – 1/2"
1200
1000
5/8" – 1"
800
600
Using the Drill Bit Speed Chart
The chart shown in
Figure 25 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.
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.
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.
some type of lubrication is necessary.
Lubrication Suggestions
Wood ...........................................................None
Plastics ........................................... Soapy Water
Brass .............................. Water-Based Lubricant
Aluminum ......................Paraffin-Based Lubricant
Mild Steel ..............................Oil-Based Lubricant
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 25. Drill bit speed chart.