Grizzly G9969 - Manual (Page 25)

G9969 Radial Drill Press
-23-
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 19 is intended as a
guide only. Always follow manufacturer's speed
recommendations if provided with your drill bits,
cutters, or hole saws. Exceeding the recommend-
ed 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.
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 work-
piece to the table to prevent injuries.
Figure 19. Drill bit speed chart.