(navigation image)
Home American Libraries | Canadian Libraries | Universal Library | Community Texts | Project Gutenberg | Children's Library | Biodiversity Heritage Library | Additional Collections
Search: Advanced Search
Anonymous User (login or join us)
Upload
See other formats

Full text of "Modern Mechanical Engineering Vol-I"

THE TOOLS

191

rule the teeth have no front rake, but clearance only, generally with two

or three facets, one being the " land " for grinding.    Formed teeth are

numerous, in which the backs of the teeth are struck from a centre eccentric

in   relation   to   the

cutter centre. These                          '"*

are reground on the

front faces only, and

retain their sectional

shapes   until   worn

thin.   These belong

to the profile group,

used for gear teeth

and allied shapes.

The Forms of
Cutters. — These
include edge, side,
end, and formed
cutters, both angular
and curved, solid
tools and those with
inserted teeth.

Edge and Side
Mills. — In these
(figs. 21, 22) the

teeth are cut on the peripheries, and on one or both ends respectively.
When cut on both ends they are used for slitting and grooving.    The

SIDE ELEV.

SECTIONALjEDGE £L£V.

Fig. 21.—Two Interlocking Slotting Cutters clutched so that Teeth overlap
and Width can be preserved after Wear

t

JOINT
FAC£

SECTIONAL EDGE ZLEV.
Fig. 22.—Interlocking Cutters in which each Alternate Tooth interlocks
cutters, in figs. 21, 22, have provisions for preserving the width. Edge
mills when over i in. in diameter are provided with spiral teeth, usually
at an angle of 10°, except in some cutters for roughing, in which this angle