# B10-H_US-EN

BORING | Inserts

Technical Information Surface Finish | General Formulas

A

The corner radius of replaceable inserts is very important in finish machining. Large corner radii (0.031" (0.8 mm) or higher allow for high feed rates with good surface quality.

B

The expected surface quality can be estimated by using the function of corner radius and feed rate formula.

C

2

R th

125 x f

[ m]

r

r

f

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

D

R th

E

2. If the feed is approximately 1/3 of the corner radius, the better the machining time and surface finish will be in finish machining applications.

F

G

H

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

r

f z =1/3xR

I

J

General Formulas

Vc = D x π x n 1000

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

Cutting Speed

(m/min)

K

n = Vc x 1000 D x π

RPM

(min -1 )

Feed Speed

V f = f x n

(mm/min)

L

D = Machining Ø

(mm)

f= Feed

(mm/u) (m/min)

r

V c = Cutting Speed

n = RPM

(min -1 )

M

ap min

INDEX

B10-H: 38

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