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

 

 

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.

Figure 29. Cutting speed table for HSS cutting

tools.

Failure to follow RPM and feed rate guide- lines may threaten operator and bystander safety from ejected parts or broken tools.

NOTICE

Failure to follow RPM and feed rate guide- lines will put undue strain on moving parts, shorten tool life, and create poor workpiece results.

G3358 Milling/Drilling Machine

Graduated Dials

The graduated dials on the handwheels for the table and fine feed can be indexed or “zeroed” to help make accurate and convenient movements. Each dial can be reset or locked with the set screw or thumbscrew provided.

Example:

Suppose you want to drill a series of holes in a workpiece at 0.625" centers. After locating the first hole’s placement and drilling, you can set the dial of the appropriate axis to zero while holding the handwheel. Move the table 0.625". Drill the next hole and proceed as above (Figure 30).

Graduated Dial

Thumb

 

Screw

Handwheel

 

Figure 30. Setting dial indicators to zero.

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Image 27
Grizzly G3358 owner manual Graduated Dials, Cutting Speeds for High Speed Steel HSS Cutting Tools, Example