Grizzly G0517g - Manual (Page 22)

-20-
Model G0517 Mill/Drill
Drilling 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 31 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 by large amounts 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 or Cast Iron .......................................None
Plastics ........................................... Soapy Water
Brass .............................. Water-Based Lubricant
Aluminum ......................Paraffin-Based Lubricant
Mild Steel ..............................Oil-Based Lubricant
Figure 31. Drill bit speed chart.
If the workpiece is not clamped down, the
operator's hand could get pulled into the bit
or the workpiece can be thrown with great
force. Clamp the workpiece to the table
before drilling.