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G1005Z Mill/Drill
-21-
Failure to follow RPM and Feed Rate
Guidelines may result in ejected parts or
broken tools
. Parts ejected at high speeds
can cause serious injury!
Choosing Milling
Speeds
It is essential to closely follow the proper cutting
speed and proper feed to reduce undue strain on
all moving parts and for operator safety.
Prior to machining, you need to determine the
RPM needed to cut your workpiece, and then set
the speed on the machine.
To determine the needed RPM:
1. Use the table in Figure 16 to determine the
cutting speed required for the material of your
workpiece.
2. Measure the diameter of your cutting tool in
inches.
3. Use the following formula to determine the
needed RPM for your operation:
(Cutting Speed x 4) / Tool Diameter =
RPM
Note:
For carbide cutting tools, double the cut-
ting speed. These values are a guideline only.
Refer to the MACHINERY'S HANDBOOK for
more detailed information.
Choosing Drilling
Speeds
Using the Drill Bit Speed Chart
The chart shown on Page 22 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/Cast Iron ...........................................None
Plastics ........................................... Soapy Water
Brass .............................. Water-Based Lubricant
Aluminum ......................Paraffin-Based Lubricant
Mild Steel ..............................Oil-Based Lubricant
Cutting Speeds for High Speed Steel (HSS)
Milling Tools
Workpiece Material Cutting Speed (sfm)
Aluminum & alloys 300
Brass & Bronze 150
Copper 100
Cast Iron, soft 80
Cast Iron, hard 50
Mild Steel 90
Cast Steel 80
Alloy Steel, hard 40
Tool Steel 50
Stainless Steel 60
Titanium 50
Plastics 300-800
Wood 300-500
Figure 16. Cutting speeds for HSS cutting tools.