Improvements in and relating to Tools for Cutting Metals.
Year: 1894

page_text: Date of Application, 19th Jan., 1894-Accepted, 10th Mar., 1894
COMPLETE SPECIFICATION.
Improvements in and relating to Tools for Cutting Metals.
We, CHARLES RISBEE IORNS of Altrincham, Cheshire, Engineer, and
GEORGE RICHARDS & Co. LIMITED of Broadheath, Cheshire, Engineers do
hereby declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This invention relates to circular steel cutting tools, several of which can be fixed
to a circular head or bush, and used as a boring or milling tool, or a single one can
be fixed to a bar, and used as a planing or turning tool, and consists of features and
details of construction hereinafter explained, by which presenting a new cutting
edge without removing the tool or re-grinding till the circular disc has made a
complete revolution, thus using the whole edge of the tool, and effecting a large
saving of time in accurate boring or milling operations.
Referring to the drawings, Sheet 1, Fig. I shows a section and plan of one of these
discs fastened by a bolt and nut to its head. Figs. 2, 3 and 4, Sheet 1, show &
boring head constructed with these disc cutters.
&
A, B and C represent the disc cutters; D the circular head or bush, and E
finishing cutter presenting a long cutting edge, which removes the slight circular
grooves left by the circular discs, thus finishing the job smooth and straight.
In looking at the plan Fig. 2, it will be noticed that B is set a little advance of A,
and C about the same in advance of B, while E is only slightly in advance of C.
This arrangement gives each cutter a proportionate amount of work to do, and
enables a quicker feed to be used in boring.
Sheet No. 2, Figs. 5 and 6 show a face-milling head constructed with these disc
cutters. In this, there are eight cutters similar to F, fastened to the circular head G
by means of the bolts H.
It will be seen that both in this, and the boring head, that when the bolt holes
are bored true, and in their right places, and the discs are kept to one diameter,
that by revolving the discs as the edge gets dulled, that a cutter may be maintained
a true size for a considerable time. When the discs are worn under size, they are
used for a smaller cutter head, and so on till the steel is used up.
Sheet 2, Figs. 7 and 8 show the cutter as arranged for a planing or turning tool.
I represents the disc held to the bar K by the bolt L. It will be seen the bar can
be any form to suit a tool rest of any description.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is ;-
1. Circular discs for cutting metals, substantially as described in accompanying
drawings.
2. The method of attaching the circular discs to the head or tool-holder,
substantially as before described.
3. The method of maintaining the same size of cutting edge by revolving the
disc in the head or tool-holder, substantially as described.

page_text: 4. The application of the improvement to any form of boring, planing, turning
milling, facing and similar machines.
317
Dated this Eighteenth day of January One thousand eight hundred and
ninety-four.