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Feeds and Speeds - Armor Mills and Drills

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


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:

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 © 2018, 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 © 2018, 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.




Broken Tap Removal Tools - Tips

Armor Mill™

Use the Armor Mill when the tap or drill is broken off below the surface of the workpiece or when the broken tap or drill has an uneven top surface that would cause the Armor Drill tip to walk or deflect.  These tools are manufactured in house with a Premium, Ultra Fine, Nano Grade, Solid Carbide for maximum tool strength.

Armor Mill Tool for drilling out broken taps and drills

Order Armor Mills Here
If possible, use a punch to make the top surface of the broken tap/drill flat before drilling. Drill at 1,200-2,500 RPM. Feed extremely slow (especially when first contacting uneven surface).

Armor Mill for Removing Broken Taps

Remove Broken Taps with Armor Mill



Armor Drill

Use the Armor Drill when the tap or drill is broken off above the surface of the workpiece or when the broken tap or drill has a flat top surface that will not cause the drill tip to walk or deflect. These tools are manufactured in house of a Premium, Ultra Fine, Nano Grade, Solid Carbide for maximum tool strength.

Armor Drill Tool for drilling out broken taps and drills

Order Armor Drills Here
Remove excess drill/tap material to create as flat a surface as possible. Spot drill the broken tap with the largest dia. Armor Drill. Drill at 1,200-2,500 RPM. Drill down through the broken tap. Use coolant if possible, peck and flush out chips with air blast. Remove remnants of broken tap with pick.

Armor Drill to Remove Broken Taps

Remove Broken Taps with Armor Drill Tool

Broken Taps Removed Using Armor Drill Tool

It is recommended that both the Armor Drill and Armor Mill tools be used in rigid machines (machining centers, knee mills, lathes) with the parts held securely. Using the hand wheel at the lowest speed, feed very slowly and keep a steady feedrate. Peck or stop frequently to remove chips from the hole. If the part needs to be drilled with a hand drill, operate the drill at faster rpms, use a strong, steady force, and keep the drill as straight as possible. It is important to prevent the tools from walking or deflecting, especially when first contacting the uneven part surface.

As with all machining, it is necessary to take appropriate safety precautions.

 

 

 

 

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