Enter Cutter Diameter and Surface Speed to Calculate the R.P.M. For deep slots reduce the Ft./Min. By 20 to 40%. All Harvey Tool products are fully-supported with their own Speeds & Feeds designed to provide the best tool possible for various applications. Save time and money by downloading and printing the Speeds and Feeds table for your specific tool, and simulate its running parameters and tool paths by accessing our complete library of simulation files.

Key Cutter Feeds And Speeds

KEO…

Is the recognized world leader in performance solid cutting tools since its inception back in the 1940s, with plants located in Warren, Michigan, and sister company KEO Milling Cutters, in Athol, Massachusetts. 9,000+ Standard tools are produced here and ready to ship! Click one of the listings on the navigation bar above to solve your cutting tool needs or use the search option at the top if you have a specific KEO tool number in mind.

A Name You Can Trust

The KEO brand is synonymous with quality and our products are used by the most successful machining businesses around the world. Over seventy years of commitment to providing the best value is evident in our extensive product offering and our competitive pricing. Whether we are producing our standard catalog offering or quickly turning a special order for our customers, all tools are produced here in the USA by our highly skilled and prideful associates. In today’s global market you need quality, precision and speed; that’s what you get from KEO, an American made product and a name you can trust.

T Slot Cutter Sizes

Standard Tools…

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Speeds & FeedsSpeeds & Feeds - CarbideClimb MillingDrill Time FormulaTool Coatings

Speeds & Feeds

Modern milling cutters capable of operating at higher feeds and speeds, and moving more cubic inches of metal per minute, require greater machine rigidity and more power.
Therefore it is important to determine that enough power is available to handle the desired depth and width of cut at the higher feeds and speeds.

T= Number of teeth in cutter
D= Cutter diameter in inches
RPM= Revolutions per minute
SFM= Surface feet per minute
F= Feed in inches per minute

f= Feed per tooth in inches
W= Width of cut
d= Depth of cut
HP= Motor horsepower
C= Machinability constant

Machinability constant values for various materials are based on removing one cubic inch of metal per minute per horsepower with 60% power efficiency at the spindle nose and a 25% allowance for cutter dulling.
Aluminum, Magnesium, Dural – 4.0 plus
Brass – 2.5
Soft Bronze, Copper – 2.0
Cast Iron – 1.5
Steel up to 150 Brinell, Malleable Iron – 0.75
Steel, 300 Brinell, Hard Bronze – 0.6
Steel, 400 Brinell – 0.5

Climb Milling

In conventional milling, the cutter revolves opposite to the direction of table feed. Therefore the width of the chip starts at zero and increases to a maximum at the end of the cut. This can lead to accelerated tool wear under some conditions – conventional milling is recommended for hot rolled steel, surface hardened materials and steels with a surface scale. In climb milling, the cutter revolves in the same direction as the table feed. The tooth meets the work at the top of the cut, producing the thickest part of the chip first. In horizontal applications the resultant force created by climb milling can act as a clamping force, acting toward the machine table. It is important to make sure that the machine tool has no leadscrew backlash. Normally climb milling improves product surface finish and increases tool life.

Advantages of Climb Milling

Longer Tool Life: Since the chips produced are deposited behind the cutter, tool life can be substantially increased.

Ease of Fixturing: Climb milling exerts a downward clamping force on the workpiece and not an upward force as in conventional milling, which results in simplified fixturing.

Improved Surface Finish: Since the chips are not carried by the cutter, less likelihood of marring the machined surface.

Lower Power Requirements: A higher rake angle can be utilized, lowering power consumption.

Better Chip Evacuation: Easier and faster chip removal since chips are deposited behind the cutter.

Drill Time Formula

Speeds & Feeds – Formula

Find:	Have:	Formula:
Revolutions per minute (RPM)	SFM	(SFM x 12) / (Diameter of drill x 3.1416)
Surface feet per minute (SFM)	RPM	(Diameter of drill x RPM x 3.1416) / 12
Feed rate per RPM (FR)	SFM and FM	(Diameter of drill x FM x 3.1416) / (SFM x 12)
Feed rate per RPM (FR)	RPM and FM	FM / RPM
Feed rate per minute (FM)	FR and RPM	RPM x FR
SFM	RPM and drill dia.	.26 x RPM x drill diameter
RPM	SFM and drill dia.	3.8 x (SFM / drill diameter)

Drill Speeds

Material	SFM*
Aluminum and Aluminum Alloys	150-300
Brass and Bronze (free cutting)	150-300
Brass and Bronze (high tensile)	70-120
Cast Iron (soft)	80-120
Cast Iron (medium)	60-90
Cast Iron (hard)	30-70
Copper	70-100
Magnesium	200-400
Nickel Base Alloys	20-50
Plastic and Related Materials	100-200
Wood	200-300

*Surface feet per minute

Drilling Time Formula

Time (Minutes) = Travel(in.) / RPM x Feed (per rev.)

Travel = Sum of: Depth of Hole, 1/3 Drill Diameter, Approach Clearance, Over Travel (through cavities) / Total Travel (in.)

Drill Speeds (Steel)

Material	SFM*
Alloyed – under 200 B.H.	60-90
Alloyed – 200 – 300 B.H.	40-70
Alloyed – over 300 B.H.	20-30
Cast and Forged	40-70
Heat Treated – 35 – 40 R.C.	30-40
Heat Treated – 40 – 45 R.C.	20-30
Heat Treated – over 45 R.C.	10-20
Mild – .2 – .3 Carbon	70-100
Mild – .4 – .5 Carbon	50-80
Stainless – 300 Series	20-50
Stainless – 400 Series	30-70
Tool – over 1.0 Carbon	40-60
Titanium Alloys	20-50

*Surface feet per minute

Drill Feeds

Diameter (in.)	Light Feeds	Heavy Feeds
1/8	.0005 – .0010	.0015
3/16	.0010 – .0015	.0020
1/4	.0015 – .0020	.0025
5/16	.0020 – .0025	.0030
7/16	.0025 – .0030	.0035
1/2	.0035 – .0040	.0045
5/8	.0045 – .0050	.0055
3/4	.0055 – .0060	.0065

The above are suggested ranges. Due to many variable in an operation, more optimum speed may be established through trial.

Tool Coatings

TiN – General purpose coating for Steels, Stainless Steels and Inconel. Excellent wear characteristics in roughing applications.

TiCN – High performance in Die and Mold Steels, Hardened Materials, Steels and Stainless Steel. Ability to run at increased Feeds and Speeds over TiN coated tools.

TiALN – Best results in Dry Milling applications at high temperatures. Works well in Hardened Materials, Titanium Alloys, Stainless Steels, Cast Irons, Graphite and HSM applications.

T Slot Cutter Speeds And Feeds Aluminum