CAT-SET

BORING | Inserts

Corner Radius

The corner radius of replaceable inserts is very important in finish machining. Large corner radii ( 0.8 mm (0.031")) or higher allow for high feed rates with good surface quality. The expected surface quality can be esƟmated by using the funcƟon of corner radius and feed rate formula. Surface Finish

1. The larger the corner radius and the lighter the feed rate is, the beƩer the surface quality.

2. If the feed is approximately 1/3 of the corner radius, the beƩer the machining Ɵme and surface finish will be in finish machining applicaƟons.

3. A larger corner radius increases radial forces, which can negaƟvely affect dimensional accuracy. Large corner radii also require increased depth of cut.

Depth of Cut (a p )

Formulas

General Formulas

Minimum depth of cut (a p ) should at least match the corner radius. This minimizes the radial forces.

D x π x n 1000 V c x 1000 D x π

Cuƫng Speed (m/min)

V c =

I

RPM (min -1 )

n =

Feed Speed (mm/min)

V f = f x n

Key

Machining Ø (mm)

D

Feed (mm/rev)

f

Cuƫng Speed (m/min)

V c

RPM (min -1 )

n

B10-I: 49

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