Circular Milling or other Cutters.
Year: 1885

page_text: Circular Milling or other Cutters.
I HERBERT LINDLEY, of Sandon Engine Works Salford Manchester in the
County of Lancaster Engineer, do hereby declare the nature of my invention for
"IMPROVEMENTS IN MACHINES FOR SHARPENING, GRINDING, CIRCULAR MILLING OR
OTHER CUTTERS," to be as follows:-
The improved machine consists of an emery wheel mounted on a spindle and
capable of being driven by a belt cord or other means and arranged so as to revolve
at a convenient height above a planed table or platform. Secured to the table is
an abutment piece capable of being adjusted so as to lie directly under the edge of
the emery wheel and of the same shape as the edge of the emery wheel (which is
ordinarily flat though for hollow curved cutters it may be curved.
The cutter is held in a simple support preferably by means of a mandrel or
spindle such support also containing a sheet steel former plate which former plate
also lies directly under the edge of the cutter to be ground.
The cutter support or holder is planed on the underside and can be moved about
in any direction on the planed table of the machine so it follows that as the former
plate is pressed against and moves on the face of the abutment aformentioned, the
tooth of the cutter to be sharpened will perform a corresponding movement in
front of the emery wheel and then the exact form of the former plate will be given
to the tooth. In cutters having an outline of a hollow curve I use a cylindrical
abutment with an emery wheel having its edge correspondingly. shaped. A holder
is provided for a small diamond tool so that the emery wheel can be rapidly turned
up and made counterpart on the edges of the abutment pieces, whether cylindrical
or flat.
An arrangement is provided by which a cutter may be used as a former
plate and the emery used to grind and produce the former plate in cases where a
former plate is required to be made from an existing cutter.
J

page_text: Circular Milling or other Cutters.
I, HERBERT LINDLEY of Sandon Engine Works, Salford Manchester in in the
County of Lancaster 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:
The improved machine consists of an emery wheel mounted on a spindle and
capable of being driven by a belt, cord, or other means, & arranged so as to revolve
at a convenient height above a planed table or platform.
Secured to the table is an abutment piece capable of being adjusted, so as to be
directly under the edge of the emery wheel, & of the same shape as the edge of the
emery wheel, (which is ordinarily flat, though for hollow curved cutters it may be
curved).
of a mandrel or
The cutter is held in a simple support preferably by means.
spindle, such support also containing a sheet steel former plate, which former plate
also lies directly under the edge of the cutter to be ground.
The cutter support or holder is planed on the underside & can be moved about
in any direction on the planed table of the machine, so it follows that as the former
plate is pressed against and moves on the face of the abutment aforementioned, the
tooth of the cutter to be sharpened will perform a corresponding movement in
front of the emery wheel & then the exact form of the former plate, will be given
to the tooth.
.
-In cutters having an outline of a hollow curve I use a cylindrical abutment with
an emery wheel, having its edge correspondingly shaped. A holder is provided for
a small diamond tool so that the emery wheel can be rapidly turned up and made
counterpart on the edge of the abutment pieces whether cylindrical or flat. An
arrangement is provided by which a cutter may be used as a former, and the
emery wheel to grind and produce the former plate, in cases where a former plate
is required to be made from an existing cutter.
And in order that my invention may be better understood I have caused to be
appended hereunto one sheet of drawings marked with letters of reference,
indicating like parts in the various figures.
Fig. 1 is a front elevation of the machine.
in section & Fig. 3. is a plan. Fig. 4 is a plan
faced cutter. Fig. 5 shows the diamond tool
cutters.
Fig. 2 is a side view partly shown
of cylindrical abutment & hollow
holder & Fig. 6 various shapes of
A is the plane table which may be made of cast iron, and planed and surfaced
up
to a smooth flat surface, a boss B is cast on one side of the table, carrying the
rising & falling arm C, which in turn carries the revolving spindle D and emery
wheel E. F is a small band pulley, by means of which the emery wheel is rotated.
G is the abutment which is preferably adjustable, in order that its face may be
brought perpendicularly under the edge of the emery wheel as shown.
His a milling cutter, such. as is used for milling out grooves in taps & for
similar purposes. This cutter H is supported on a spindle I secured by means of a
set screw or other device in the cutter holder K, which is made with a flat &
smooth base to enable it to be slidden freely on the surface of the table A
Towards or near the lower face of the cutter holder K, is secured, as shown, a
flat steel or other suitable former L, having its projecting end shaped to the form

page_text: that it is required to impart to the teeth of the cutter. This former L is also
capable of adjustment, so that, as will be hereinafter seen, a greater or less amount
can be ground off the teeth of the cutter by means of the emery wheel E.
The abutment G, being set, as shown, perpendicularly under the edge of the
emery wheel E and the end of the former also, being adjusted so that the tooth of
the cutter overhangs it, it will be seen that by bringing the former L, up to the
abutment G, and moving the cutter holder about on the table A taking care always
to keep the former pressed firmly against the abutment G, the tooth of the milling
cutter will also be moved about in front of the face of the emery wheel, & by
reason of its slightly overhanging, the edge of the former, will be ground away, or
sharpened by the wheel until it has exactly the same shape or contour imparted
to it, that is possessed by the former.
Various shaped holders may be made to suit different sizes of cutters, so long as
in each of them is made a provision for the reception of a former, having the
required form of cutter tooth on it, as in Fig. 6 so arranged as to work against the
abutment. The machine may also be used, to sharpen straight or curved fluted
rhymers, for which purpose I mount the rhymer in centres and considerably
prolong the face of the abutment G so that the holder carrying the centers, & the
rhymer between them may easily be slidden in a straight line across the face of
the emery wheel E.
A hinged hook or tight spring M, affixed to some convenient point of the cutter
holder on the table, serves the purpose of a stop or dividor, for bringing successive
tecth into contact with the wheel.
In order to sharpen cutters having their cutting teeth of a form containing a
hollow curve I use an emery wheel of semi-circular section at the periphery.
In this case the abutment is made cylindrical, and of the same diameter as the
thickness of the wheel.
Fig. 4 shows the wheel & abutment in plan, operating on a cutter tooth of hollow
curved section.
A diamond mounted in a holder capable of sliding about on the table, in the
same manner as the cutter holder and provided with a flat edge to work against
the abutment, serves to true up the emery wheel and make it a counterpart on its
periphery, either of the flat or cylindrical abutment.
Fig. 5 shows the diamond tool applied to trueing up the emery wheel.
In conclusion I am aware that emery wheels have been used to sharpen cutters,
in conjunction with a former, but what I claim and what I believe to be
novel is
1st The provision of a plane table containing an abutment piece & placed in
proximity to an emery wheel, on which table, is permitted to slide in any direction,
a holder or support for a circular cutter, drill, rhymer or other tool, so that the
form desired to be imparted with the cutter or tool, may be copied or reproduced
from a former plate secured to the holder or support, for the purpose & in the
manner described.
2nd The construction and parts of a machine, consisting of a plane table placed
underneath a revolving emery wheel, with abutment piece, moveable cutter,
holder, or tool support, and former plate, for the purpose specified, as described
& illustrated in the drawings.
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