Choosing Spindle Speeds - Grizzly T31739 Owner's Manual

Using Drill Bit Speed Chart
The chart shown in Figure 21 is intended as a
generic guide only. Always follow the manufac-
turer'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.
Twist/Brad Point Drill Bits
1/16" – 3/16"
13/64" – 3/8"
25/64" – 5/8"
11/16" – 1"
Spade/Forstner Bits
1/4" – 1/2"
9/16" – 1"
1-1/8" – 1-7/8"
2–3"
Hole Saws
1/2" – 7/8"
1" – 1-7/8"
2" – 2-7/8"
3" – 3-7/8"
4" – 5"
Rosette Cutters
Carbide Insert Type
One-Piece Type
Tenon/Plug Cutters
3/8" – 1/2"
5/8" – 1"
Model T31739 (Mfd. Since 11/19)

Choosing Spindle Speeds

Soft Wood
3000
2000
1500
750
Soft Wood
2000
1500
1000
500
Soft Wood
500
400
300
200
100
Soft Wood
350
1800
Soft Wood
1200
800
Figure 21. Drill bit speed chart (RPMs).
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 workpiece aggressively. This can
result in operator's hand being pulled into
bit or workpiece being thrown with great
force. Always clamp workpiece to table to
prevent reduce risk of injury.
Hard Wood Plastic Brass
2500 2500 2500
1500 2000 1250
750 1500
500 1000
Hard Wood Plastic Brass
1500
1250
750
350
Hard Wood Plastic Brass
500 600
400 500
300 400
200 300
100 200
Hard Wood Plastic Brass
250
500
Hard Wood Plastic Brass
1000
600
Aluminum Mild Steel
3000 2500
2500 1250
750 1500 600
400 1000 350
Aluminum Mild Steel
Aluminum Mild Steel
600 600 500
500 500 400
400 400 300
300 300 200
200 200 100
Aluminum Mild Steel
Aluminum Mild Steel
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