Improvements in Rotating-cutter or Milling Machinery.
Year: 1892

page_text: Date of Application, 18th Oct., 1892
Complete Specification Left, 17th July, 1893-Accepted, 26th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Rotating-cutter or Milling Machinery.
I, ANDREW BETTS BROWN, of Rosebank Iron Works, Edinburgh, in the
County of Mid Lothian, North Britain, Engineer, do hereby declare the nature of
this invention to be as follows, that is to say :-
My said invention has for its object to improve the construction and manner of
securing the tool holders or tools of rotating-cutter or milling machines.
In carrying out the invention according to one modification suitable for cutters
made of round steel rod I employ for carrying the cutters a disk which has formed
on the outer part of its face a raised annular part across which are formed a series
of grooves which are radial or nearly so and parallel-sided. Into each groove there
fits a tool holder block, which is bolted to the disk, and which is bored obliquely to
receive the cutter. The cutter which is fixed in each holder by a pair of screws
projects slightly outwards and slightly forward from its holder in such manner as
to be clear of the work except at the cutting point, the holder also having its outer
end suitably shaped to be clear.
In another modification suitable for cutters cut from bars rolled with a tapering
cross section, the cutters are placed in grooves formed across the periphery or rim
of the disk, and are fixed each by a pair of screws screwed through a ring shrunk
on the periphery of the disk. The cutters project from the front of the disk and
have their cutting points formed at the outer angle of the thicker edge, the tapered
shape giving clearance when cutting.
Dated this Seventeenth day of October 1892.
EDMUND MUNI,
Applicant's Agent,
Per pro David Ferguson.
COMPLETE SPECIFICATION.
Improvements in Rotating-cutter or Milling Machinery.
1, ANDREW BETTS BROWN, of Rosebank Iron Works, Edinburgh, in the
County of Mid Lothian, North Britain, Engineer, 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, that is to say :-
My said invention has for its object to improve the construction and manner of
securing the tool holders or tools of rotating-cutter or milling machines.
In carrying out the invention according to one modification suitable for cutters
made of round steel rod I employ for carrying the cutters a disk which has formed
on the outer part of its face a raised annular part across which are formed a series
of grooves which are radial or nearly so and parallel-sided. Into each groove there
fits a tool holder block which is bolted to the disk, and which is bored obliquely to
receive the cutter. The cutter which is fixed in each holder by a pair of screws
projects slightly outwards and slightly forward from its holder in such manner as to
be clear of the work except at the cutting point, the holder also having its outer
end suitably shaped to be clear.
In another modification suitable for cutters cut from bars rolled with a tapering
cross section, the cutters are placed in grooves formed across the periphery or rim
of the disk, and are fixed each by a pair of screws screwed through a ring shrunk
on the periphery of the disk. The cutters project from the front of the disk and

page_text: have their cutting points formed at the outer angle of the thicker edge, the tapered
shape giving clearance when cutting.
And in order that my said invention and the manner of performing the same may
be properly understood I hereunto append two sheets of explanatory drawings to be
hereinafter referred to, and showing my improved apparatus.
Figures, 1, and, 2, of Sheet, 1, of the drawings are elevations as at right angles
to each other of one modification.
Figure, 3, is a plan, and Figures, 4, and, 5, are elevations as at right angles to
each other of one of the tool-holder blocks and cutters constituting part of the
first modification.
Figure, 6, is a transverse vertical section, Figure, 7, a face elevation, and
Figure, 8, a partial edge elevation as at right angles to Figure, 7, of a second
modification.
Figure, 9, is an end elevation, Figure, 10, a plan and Figure, 11, another end
elevation of one of the cutters.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
As shown in Figures, 1, and 2, of the drawings I employ for carrying the cutters,
a disk, A, which has formed on the outer part of its face a raised annular part, B,
across which are formed a series of grooves, C, which are radial or nearly so
and parallel-sided. The disk, A, is provided with a circular series of tool-holder
blocks, D, of which, however, only three are shown in Figures, 1, and, 2, these
blocks, D, being fitted into the grooves, C, and fixed to the disk by bolts.
Each block, D, is bored obliquely at its outer part to receive the cutter, F, which
is a piece of round steel rod. The cutter, F, which is fixed in each holder, D, by
a pair of screws, G, is nearly tangential but projects outwards and slightly forwards
from its holder, D, in such manner as to be clear of the work except at the cutting
point, H, the holder, D, also having its corner, J, rounded or suitably shaped to be
clear. This modification of the improved apparatus although applicable for
other work is principally used when a large or "roughing cut is to be taken off
the work.
"
In another modification shown in Figures, 6, 7, and, 8, suitable for cutters, F, cut
from bars rolled with a tapering cross section, the cutters are placed in grooves, C,
formed across the periphery or rim of the disk, A, and are fixed each by a pair of
screws, G, screwed through a ring, K, shrunk on the periphery of the disk. The
cutters, F, project from the front of the disk, A, and have their cutting points, H,
formed at the outer angle of the thicker edge, the tapered shape giving clearance
when cutting.
Although the disk, A, is shown as fitted with only a few cutters, F, it is to be
understood that one is fitted into each groove, C; and to enable all the cutters, F,
to be set with their cutting points accurately at the same distance from the face of
the disk, A, I employ a small gauge, L, having two parallel surfaces, the one set
back a small distance from and extending beyond the other to the extent to which
the cutter is to project. The gauge, L, is adjustably fixed to the disk, A, near the
cutters, F, by a hand screw nut, M, and bolt, N, the latter of which is movable
around the disk in an annular dovetail groove, P, by which it is retained.
The cutters, F, are set to touch the gauge, L, and are fixed there by their
screws, G.
The disks, A, of both modifications may be fixed on a vertical, horizontal, or
inclined spindle and be made capable of moving in the direction of the spindle
as well.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In rotating-cutter or milling machinery a disk having a raised annular part
formed with radial or nearly radial grooves in each of which is fixed a tool-holder

page_text: block having a cutter of round steel which is nearly tangential but projects slightly
outwards and forwards, the parts being constructed and arranged substantially in
the manner and for the purposes hereinbefore described with reference to
Figures, 1, 2, 3, 4, and, 5, of the accompanying drawings.
2. In rotating-cutter or milling machinery, a disk having grooves formed across
its periphery or rim, in which cutters formed from steel bars of taper cross section
are fixed by screws screwed through a ring shrunk on, the periphery of the disk,
the parts being constructed and arranged substantially in the manner and for the
purposes hereinbefore described with reference to Figures, 6, 7, 8, 9, 10, and 11, of
the accompanying drawings.
Dated this Fourteenth day of July 1893.
EDMUND HUNT,
Applicant's Agent.