Woodstock M1001 Determining Needed RPM, Cutting Speeds for High Speed Steel HSS Cutting Tools

Page 24

M1001 6" x 26" Vertical Mill

OPERATIONS

Determining Needed RPM

Before changing speeds, you must first determine the best RPM to use with the material and diameter of your cutting tool. Using this determined RPM, you can then set the mill to match that speed.

To determine the RPM needed for your workpiece, do these steps:

1.Use the chart in Figure 22 to determine the cutting speed for your workpiece material.

2.Measure the diameter of your cutting tool in inches.

3.Use the following formula in Figure 23 to determine the best RPM for your operation.

Note: Always round to the closest RPM given on the spindle speed chart.

Example 1

You have a piece of aluminum stock, and you are using a 1/2" diameter HSS cutting tool.

Step 1:

300 (SFM from chart) x 4 = 1200

Step 2:

1200 / .5" (Diameter of cutting tool) = 2400 RPM

Result:

The best speed for this workpiece is 2400 RPM.

Example 2

You have a piece of stainless steel, and you are using a 1" diameter carbide cutting tool.

Step 1:

60 (SFM from chart) x 2 (for carbide tool) = 120

Step 2:

120 (determined SFM) x 4 = 480

Step 3:

480 / 1" (Diameter of cutting tool) = 480 RPM

Result:

The best speed for this workpiece is 480 RPM.

Cutting Speeds for High Speed Steel

(HSS) Cutting 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

*For carbide cutting tools, double the cutting speed. These values are a guideline only. Refer to the current edition of MACHINERY'S HANDBOOK for more detailed information.

Figure 22. Cutting speed chart for HSS

cutting tools.

Figure 23. Formula to determine required

RPM.

-22-

Image 24

Contents 26 Vertical Mill Page Table of Contents Introduction Woodstock Technical SupportAbout Your New 6 x 26 Vertical Mill Model M1001 Shop FOX Vertical Mill 6 X Lead Screw Info Electrical Controls and Features Safety Standard Machinery Safety InstructionsSafety Additional Safety Instructions for Vertical Mills Electrical AvailabilityFull-Load Current Rating Full-Load Current Rating atNominal Voltage 110V/120V Cycle 60 Hz Phase Nominal Voltage 220V/240V Cycle 60 Hz PhaseCircuit Information Circuit Requirements forGrounding & Plug Requirements Extension CordsVoltage Conversion SET UP UnpackingInventory Machine Placement Cleaning Machine M1001 minimum working clearancesUsing Machine Mounts Mounting Mill on Shop FloorBolting to Concrete Floors Assembly Headstock AdjustmentHandle Installation DrawbarTo begin the test run procedure, do these steps Spindle ControlsTest Run Operations GeneralPositioning Spindle Head Table Travel Longitudinal Feed ControlCross Feed Knee FeedPower Feed Controls Graduated DialsExample Micro-feed Depth Adjustment Quill TravelQuill Feed Control To use the quill feed handle, do these stepsDetermining Needed RPM Cutting Speeds for High Speed Steel HSS Cutting ToolsSetting RPM Unplug the MillSpindle Break-in Procedure Installing Tools Removing Cutting ToolsTo load a tool in the spindle, do these steps To remove cutting tools, do these stepsMaintenance CleaningTable and Base Power Feed LubricationSingle Shot Lubrication System Knee Elevating ScrewMaintenance Schedule Maintenance NotesService GibsAdjusting Backlash Longitudinal Feed AdjustmentCrossfeed Adjustment To adjust the backlash, do these stepsElectrical Safety Instructions Wiring Diagram Color KEYElectrical Parts Identification StopWiring Diagram VAC 150F CapacitorTroubleshooting Symptom Possible CauseHeadstock Assembly Base Assembly Machine Parts Lists DescriptionCross Lead Screw Machine Labels DescriptionWarranty Warranty Registration CommentsWoodstock international inc. p.o. box Bellingham, wa