Onsrud AMC703502

• AFS: Aluminum Finisher Short
• Solid Carbide End Mill
• Open Flute Geometry Optimized for Slotting Applications
• Chip Former on Flute Face for Optimal Chip Removal
• Polished Flutes for Better Chip Removal
• Application: Slotting, Pocketing, Profiling, High Material Removal
• Usage: ISO N Non-Ferrous, Aluminum, Brass, Bronze, Copper

• Upcut Flute: Provides the best surface finish and allows for good chip extraction./li>
• l₁ Overall length: 3"
• l₂ LOC: 1"
• d₁ Cutting diameter: 3/4"
• d₂ Shank diameter: 3/4"
• Corner Radius: Square
• Flute count: 3

• SFM = RPM x .262 x tool diameter
• RPM = (3.82 x SFM) / tool diameter
• Feed Rate IPS (inches per second) = (chip load x flute count x RPM) / 60 (to work in IPM inches per second use the formula: chip load x flute count x RPM
• Chip Load (this is per flute) = see table below

• Required information: SFM, RPM, Feed Rate, Pass Depth, Chip Load



Definitions:

SFM = "Surface Feet per Minute" = The speed of the end mill moving past the workpiece and is a constant value and not dependent on end mill diameter.

RPM = "Revolutions per Minute" = The speed at which the end mill is spinning.

Feed Rate =

Pass Depth =

Chip Load =




Example:

Finishing in aluminum = 1000 (if we are going to use the median)

In this example we will be full slotting in aluminum.




Step 1: determine RPM.

We know RPM = (3.82 x SFM) / tool diameter, therefore:

(3.82 x 1000) / .75 =

3820 / .75 =

5093

RPM = 5093




Step 2: determine Feed Rate in IPS.

We know Feed Rate IPS = (chip load x flute count x RPM) / 60 therefore:

(.0085 x 3 x 5093) / 60 =

129.87 / 60 =

2.16

Feed Rate IPS = 2.16"




Step 3: Determine Pass Depth. I run only cold air, no lubricant, therefore I stick to .005 - 0075" Pass Depth

Typical material settings are as follows:

• Aluminum ( SFM Range: min 500, median 1000, max 1500)
• Full Slotting: .0085
• Heavy Profile: .0090
• HEM Profile: .0119
• Finishing: .0195

• Brass / Bronze ( SFM Range: min 500, median 700, max 900)
• Full Slotting: .0069
• Heavy Profile: .0080
• HEM Profile: .0097
• Finishing: .0158

• Copper Alloys ( SFM Range: min 700, median 850, max 1000)
• Full Slotting: .0040
• Heavy Profile: .0046
• HEM Profile: .0056
• Finishing: .0092

• Magnesium ( SFM Range: min 500, median 700, max 900)
• Full Slotting: .0085
• Heavy Profile: .0090
• HEM Profile: .0119
• Finishing: .0195