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Feeds and Speeds - End Mills

Feeds and Speeds for 2L End Mills and Armor Mills


Reference the below tables for general Feed and Speed Rates


TABLE 1 - Feeds & Speeds

End Mills

Material SPEED [SFM] D=1/8” D=1/4” D=1/2”
Aluminum/Aluminum Alloys 600-1200 0.0005 0.002 0.004
Brass/Bronze 200-350 0.001 0.002 0.003
Copper/Copper Alloys 450- 850 0.001 0.002 0.002
Cast Iron, Soft 300- 750 0.001 0.002 0.003
Cast Iron, Hard 125- 350 0.0004 0.0008 0.002
Ductile Iron 150- 450 0.0005 0.001 0.002
Malleable Iron 300- 550 0.0005 0.001 0.003
Magnesium/Magnesium Alloys 1100-1600 0.001 0.002 0.004
Monel/High Nickel Steel 225-350 0.0005 0.001 0.002
Nickel Base Hi-Temp. Alloys 50-125 0.0004 0.0008 0.001
Plastics 900-1800 0.0015 0.003 0.006
Plastics, Glass Filled 400-1000 0.0015 0.003 0.004
Steel, Low Carbon 300- 600 0.0005 0.001 0.003
Steel, Medium Carbon 150- 450 0.0006 0.0015 0.002
Steel, Hardened 50- 225 0.0002 0.0005 0.001
Stainless Steel, Soft 250- 500 0.0005 0.001 0.002
Stainless Steel, Hard 75- 275 0.0002 0.0005 0.001
Titanium, Soft 175- 400 0.0005 0.001 0.002
Titanium, Hard 75- 250 0.0003 0.0005 0.001
Copyright © 2017, 2L inc., www.2Linc.com

Please note as with all machining, it is important to take appropriate safety precautions.

RPM = (SFM x 3.82) / D
IPM = (No. of teeth) x IPR x RPM

FOR SLOTTING APPLICATIONS:  Reduce Speed to approximately 80% of the lower values for the particular material being machined.

AXIAL DEPTH OF CUT:  These recommendations are for axial depths of cuts not to exceed 1 times the cutter diameter. On tougher materials, depths per pass as low as 0.001" are not uncommon.

RPM= Spindle Speed.
D = Diameter of tool.
IPR = Inches per rev.
IPM = Inches per minute.
IPT = Inches per tooth.
SFM and SFPM = Surface feet per minute.

 

Note:  Variations in the above table may be required depending on material being machined and cutting conditions. Consider the above recommendations as a starting point.




TABLE 2 - Feeds & Speeds

Armor Mills


Armor Mills are designed for use with rigid cnc machines when cutting or engraving granite or other hard materials.

Control of the depth of cut, the spindle speed, and the cutting feedrate is critical to achieve maximum tool life.

Cutting granite or other extremely hard materials may not be possible with the use of a hand operated tool or the life of the tools may be significantly reduced.

2L inc. has tested the armor mills on granite with a rigid cnc machine and a rigidly held workpiece. 

Feedrates are below:

Material Recommended Speed (SFPM) and Feedrates (IPT) Cutting the below piece of granite, 2L used:
Cutter Diameter = .078"

Depth of Cut per pass = .020"
Cutter Diameter = .125"

Depth of Cut per pass = .030"
Granite
Stone
Armor Plate
Hardened Steel
50- 125 SFPM

0.0001-0.001 IPT
6000 RPM
F5.0 IPM

Plunge = 2.0 IPM

6000 RPM
F6.0 IPM

Plunge = 2.0 IPM
Broken Taps
and Drills
50- 125 SFPM

0.0001-0.0005 IPT
1500-2500 RPM

Plunge = 0.1 IPM
1500-2500 RPM

Plunge = 0.1 IPM
Copyright © 2017, 2L inc., www.2Linc.com

Please note as with all machining, it is important to take appropriate safety precautions.

Use of coolant is typically recommended  and will extend the life of the engraving tool bit.

The sample of granite shown below was machined at the specific feeds and speeds listed above in the table. The Armor Mills successfully machined for 30 minutes at the above conditions to complete the sample.

Armor Mill and Armor Drill, for milling and drilling hard materials, stone, granite, armorplate, brick, high speed steel, hardened steel.

Note: Consider the above feeds and speeds as a reference point. Variations in the above table may be required depending on material being machined and cutting conditions.

To remove broken taps and drills, it is recommended to feed the tools by hand (handwheel on lowest feedrate) until the tool has plunged far enough into the broken tool to encounter a stable cutting condition.

In other words, as the tool begins cutting into the uneven jagged surface of the broken tool, feed extremely slowly to prevent the tool from walking which will put high side loads on the cutting tool and lead to breakage.

Once the tool is fully into the cut and seems stable, feeding with the cnc control at the above feeds and speeds is possible.

Stones such as granite and marble have different machining properties among different varieties and even at different spots within the same piece of stone.


RPM = (SFPM x 3.82) / D
IPM = (No. of teeth) x IPT x RPM
 

RPM= Spindle Speed.
D = Diameter of tool.
IPR = Inches per rev.
IPM = Inches per minute.
IPT = Inches per tooth.
SFM and SFPM = Surface feet per minute.

 

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