Advantages and Disadvantages of Using a 45-degree Face Mill vs. a 90-degree Face Mill
To achieve greater productivity and problem-free milling, use a lead angle cutter whenever possible. Chip thickness is affected by the lead angle. The greater the lead angle, the greater the chip-thinning effect.
Lead Angle Thickness
Feed Per Tooth
.707 x A
.070" x .010" = 0071"
Well-balanced axial and radial cutting forces.
Less breakout on workpiece corner.
Entry shock is minimized.
Less radial forces directed into the spindle bearings.
Higher feed rates possible.
Reduced maximum depth of cut due to lead angle.
Larger body diameter can cause fixture clearance problems.
No 90-degree corner milling.
Can cause chipping or burring on exit side of cutter rotation.