Discover the competitive edge with Metal Master
Milling Cutters with Frustum Inserts
Look at it from all angles
 Frus'tum/n: **
That part of a cone-shaped solid next to the base and formed by cutting off the top with a plane parallel to the base.
Frustum is tougher, works longer
We've turned the corner to twenty first century technology. When you use Metal Master Milling Cutters with patented Frustum* inserts you don't have to sacrifice toughness and durability for speed (or vice versa) like you do when you choose between conventional inserts. In fact, Frustum inserts eliminate the need to compare positive versus negative geometries, period. Now, you just compare Frustum to everything else, and Frustum beats everything else. Because mass is relocated outside the cutting edge where it strengthens, stabilizes, and aids in heat dissipation. Even the severe shock associated with interrupted cuts is no problem. In other words, Frustum lasts longer. So, productivity climbs.
**(Webster's) *US PATENT NO. 4,621,955
| Feature |
Conventional Positive
|
Conventional Negative
|
Round / Positive
|
Frustum
|
| Metal Removal Rate (per H.P.) |
High
|
Low
|
High
|
High
|
| Operating Speed |
High
|
Low
|
High
|
High
|
| Efficiency of Power Use |
High
|
Low
|
High
|
High
|
| Heat Dissipation |
Poor
|
Fair
|
Poor
|
Excellent
|
| Number of Usable Sides |
One
|
Two
|
One
|
Two
|
| Edge Strength |
Weak
|
Strong
|
Weak
|
Strongest
|
| Insert Life |
Short
|
Average
|
Short
|
Long
|
| Work Piece Distortion |
Less
|
More
|
Less
|
Less
|
| Rigidity Requirement |
Less
|
More
|
Less
|
Less
|
| Versatility of Applications |
Limited
|
Limited
|
Limited
|
Many
|
 Going Beyond Round
Compared to other shapes, conventional round inserts have two advantages. They are inherently stronger, and, they have more cutting edges. Like other conventional geometries however, conventional round inserts still force you to choose between efficiency (positive) and insert life (negative). Frustum, on the other hand, goes beyond round. When compared to a conventional round insert design, a Frustum insert has a major advantage. A Frustum insert's cutting edge has the reinforcement of the additional mass that other round inserts don't have. When you go beyond round, you don't have to choose between efficiency and longer insert life. You get both.
Boost your productivity
When you go beyond conventional thinking you go beyond conventional results. The Frustum design eliminated angles and straight lines, flats and squares. It's more than simply round. It's a unique and stronger geometry. Moreover, this geometry allows you to lower your costs and increase the productivity of every milling machine in your shop. Not only will you see it happen-your trained ear will hear it happen.
Faster removal rates. More chips, lower costs per hour.
Frustum inserts permit significantly higher operating speed because of the high efficiency of the cutting edge. The amount of horsepower converted into cutting energy is maximized. You can operate much faster than you can with conventional tungsten carbide inserts. Productivity climbs even higher.
There are two sides to the story. More than double the cutting indexes.
|
1/2"
|
Depth of cut
|
inch
|
.03
|
.12
|
.25
|
|
mm
|
.08
|
3.2
|
6.3
|
| indexes/insert |
24
|
12
|
8
|
|
3/4"
|
Depth of cut
|
inch
|
.05
|
.19
|
.37
|
|
mm
|
1.3
|
4.8
|
9.5
|
|
indexes/insert
|
24
|
12
|
8
|
|
|
Frustum inserts can boost your productivity another way too. The Frustum double-sided design, combined with the high stability and strength of unconventional, more effective Frustum geometry, provides up to twice as many indexes as conventional inserts. |
Simplify your life
There are only five Frustum insert grades in two sizes to choose from. Two for steel cutting, one for cast iron, one for all non-ferrous materials and one for Titanium. It's that simple. With just these inserts in your arsenal of tools, you can handle virtually any milling job that comes along. You can minimize your insert investment and inventory-and maximize productivity. There's less time lost choosing and changing inserts.
Provides outstanding finish
With a large radius and no sharp corners in contact with the part being worked, Frustum inserts can provide a finish as good as 16µ " (0.4µ) Ra. You may be able to eliminate the need for grinding. So, you may boost productivity even further.
Frustum Posi-Grip Insert Specifications
Frustum Posi-Grip inserts are versatile. Name your material. Chances are Frustum inserts can handle it better and faster.
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