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Feeds and Speeds

Feeds and Speeds for Armor Mills and Armor Drills & Broken Tap Removal


Reference the below tables for general Feed and Speed Rates

TABLE 1 - Feeds & Speeds

Armor Mills - for Granite, Armor Plate, Hard Materials



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:

Cutting the below piece of granite, 2L used:
Material Recommended Speed (SFPM) and Feedrates (IPT) 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 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 (hand wheel 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.

 


TABLE 2 - Feeds & Speeds

Armor Drills

Material Recommended Speed (SFPM) and Feedrates (IPT) Cutter Diameter = .078" Cutter Diameter = .125"
Granite
Stone
50- 125 SFPM
0.0001-0.0005 IPT
1500-2500 RPM
F5.0 IPM
Plunge = 1.5 IPM
1500-2500 RPM
F6.0 IPM
Plunge = 1.5 IPM
Broken Taps and Drills
Armor Plate
Hardened Steel 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.

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

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

To remove broken taps and drills, it is recommended to feed the tools by hand (hand wheel 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= 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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