An Improved Cutter Grinding Machine.
Year: 1891

page_text: Date of Application, 15th Sept., 1891
Complete Specification Left, 13th June, 1892-Accepted, 16th July, 1892
PROVISIONAL SPECIFICATION.
An Improved Cutter Grinding Machine.
We, JOHN HENRY STOREY of 46 Hatfield Street, Blackfriars, in the County
of Surrey, Engineer, HENRY JESSE BAMFORD of 61 Somerville Road, New
Cross, in the County of Kent, Engineer and ARTHUR MARTIN of Fern Villa,
Old Charlton, in the County of Kent Engineer, do hereby declare the nature of
this invention to be as follows:-
Our invention relates to an improved machine for grinding cutters, and it has for
its object, enabling cutters of any shape and size to be ground with speed and
accuracy, and saving many valuable cutters which are now thrown aside through
the inability to regrind them after they have become dull.
We construct our improved machine in the following manner:-On a suitable
pedestal or frame is mounted-in suitable bearings-a spindle driven by any
suitable over-head gear, and adapted to carry on one of its ends the cutter to be
ground.
On the side of the pedestal or frame, under the end of the spindle adapted to
carry the cutter to be ground, is a table adjustable vertically with respect to the
pedestal or frame. On this table is a transverse slide-plate or rest operated by a
screw in the usual manner. On this slide-plate or rest is mounted a plate capable
of rotating in the horizontal plane on the said slide-plate or rest. This plate
carries a second slide-plate or rest. On this second slide-plate or rest is mounted a
second plate capable of rotating in the horizontal plane. This second rotating
plate carries a third slide-plate or rest, on which is mounted a bracket carrying the
grinding emery wheel, which is mounted on a spindle carried in a suitable bearing
and operated by a band from the overhead gear. The plates adapted to rotate in
the horizontal plane are each provided with a locking device whereby they may be
fixed to the respective slide-plates or rests carrying them. It will thus be seen
that owing to the compound slide-plates or rests and the rotating plates, the
grinding wheel may be constrained to move in any desired path, thus enabling
cutters of any shape to be accurately ground. To hold the cutter to be ground
in any position for grinding its teeth along their true cutting edges, we mount on
the slide-plate or rest carrying the grinding wheel an adjustable arm carrying at
its end a vertical spring arm having a catch on its free end, which engages with
the teeth of the cutter to be ground, and moving as it does with the grinding wheel,
it causes the cutter to move correspondingly if the teeth of the said cutter are
helical. When one tooth of a cutter is ground, the cutter is rotated by hand until
the catch on the spring arm engages with the next tooth, and so on until all the
teeth are ground.
Dated this 16th day of Sentember 1801

page_text: Old Charlton, in the County of Kent, 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 :-
Our invention relates to an improved machine for grinding cutters, and it has
for its object enabling cutters of any shape and size to be ground with speed
and accuracy, and saving many valuable cutters which are now thrown aside
through the inability to regrind them after they have become dull.
We construct our improved machine in the following manner :--On a suitable
pedestal or frame is mounted-in suitable bearings a spindle driven by any
suitable over-head gear, and adapted to carry on one of its ends the cutter to
be ground. On the side of the pedestal or frame, under the end of the spindle
adapted to carry the cutter to be ground, is a table adjustable vertically with
respect to the pedestal or frame. On this table is a transverse slide plate or
rest operated by a screw in the usual manner. On this slide plate or rest
is mounted a plate capable of swivelling or rotating in the horizontal plane
on the said slide plate or rest. This plate carries a second slide plate or rest.
On this second slide plate or rest is mounted a second plate capable of swivelling
or rotating in the horizontal plane. This second rotating plate carries a third
slide plate or rest, on which is mounted a bracket carrying the grinding emery
wheel or wheels mounted on a spindle carried in suitable bearings and operated
by a band from the overhead gear. The plates adapted to swivel or rotate in the
horizontal plane are each provided with a locking device whereby they may he
fixed to the respective slide plates or rests carrying them. It will thus be seen
that owing to the compound slide plates or rests and the rotating plates, the
grinding wheel may be constrained to move in any desired path, thus enabling
cutters of any shape to be accurately ground.
To hold the cutter to be ground in the desired position for grinding its teeth along
their true cutting edges, we mount on the slide plate or rest carrying the grinding
wheel, or on the slide plate or rest on the table of the pedestal, an adjustable
arm carrying at its end a vertical spring arm having its free end adapted to engage
with the teeth of the cutter to be ground. When fixed in the former position it
moves with the grinding wheel, and thus imparts to the cutter a corresponding
movement if the teeth of the said cutter are helical. When one tooth of the cutter
is ground, the cutter is rotated by band until the end of the spring arm engages
with the next tooth, and so on until all the teeth are ground.
In order that our invention may be fully understood we will more particular
describe it making reference to the accompanying drawings, in which
Figure 1. Sheet No. 1. is a view in perspective on a small scale showing our
improved machine grinding the teeth of a round nosed cutter.
Figure 2. Sheet No. 2. is a view in side elevation thereof, and
Figure 4. Sheet No. 3 is a view in plan thereof.
Throughout these views similar parts are marked with like letters of reference.
On a suitably shaped pedestal A is mounted in suitable bearings A¹, A', an axle
or spindle B carrying. pulleys adapting it to be driven from any suitable overhead
gear. The one end of this axle or spindle B is preferably adapted to carry a
grinding wheel Crotating in a trough A, and the other is adapted to receive a
spindle to carry. the cutter to be ground.
On to the pedestal or frame A under the end of the spindle adapted to carry the
cutter to be ground, is mounted so as to be adjustable vertically a table D, on
which is mounted a transverse slide plate or rest E operated by a screw E' in the
usual manner.
On this slide plate or rest E is mounted a plate F adapted to swivel
or rotate on a central pine carried by the slide plate or rest E. This plate F
carries a bed F¹ for a second slide plate or rest Ġ operated either by the usual
screw, or preferably by two thumb screws f,f, threaded into links f',', fulcrated
to the side of the bed F. On this slide plate or rest G is mounted a plate H
adapted to rotate or swivel on a pin or stud g carried by the slide plate or rest G.

page_text: This plate H carries or forms a bed H for a third slide plate or rest J operated
by a screw J¹ in the usual manner. On this slide plate or rest J is formed or fixed
a bracket L carrying bearings 1, 1, for the spindle M carrying the emery grinding
wheels N, N. The spindle M is driven from the overhead gear by a band or its
equivalent. In the plate F is cut or formed a segmental alot f, through which
one or two locking bolts ff, threaded into the plate or rest E pass, and provide
a means for locking the said plates the one to the other in any desired position.
The plate H may also be provided with a similar segmental slot and locking bolt,
but we prefer to provide it with a hole through which a bolt h may be passed and
screwed into the plate or rest G, thus providing a means of locking the one to the
other. When it is desired to lock this bed in any other position with respect to the
plate H we prefer to use the thumb screws h¹, h, threaded into links h³, h³,
fulerated to the side of the plate H.
To hold the cutter to be ground in its true position for grinding we mount in the
bracket L an arm O capable of adjustment therewith by means of the set screw P.
On the end of this arm is a vertical spring finger O' adapted to engage with the
teeth of the cutter to be ground. As this spring finger moves with the grinding wheel
we sometimes mount the arm carrying the spring finger in a bracket Q having a
stem Qadjustable vertically in a socket R fixed to the slide plate or rest E, in
which case the said spring finger will not move with the cutter. When using this
spring arm, the other spring arm may be either removed or placed on the other side
of the grinding wheel as shown by Figures 2, 3, and 4 of the accompanying
drawings.
It will be seen that with our improved grinding machine, cutters of a circular
or semicircular form, either convex or concave, can be accurately ground, and
that the machine can also be used for grinding all other types of cutters, reamers
or taps.
We wish it to be particularly understood that we do not limit ourselves to
the precise details of construction.hereinbefore described and illustrated by the
accompanying drawings, but that we hold ourselves at liberty to make such
changes and alterations as fairly fall within the spirit and scope of our invention.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:
1. The improved cutter grinding machine, as hereinbefore described and
illustrated by the accompanying drawings.
2. In a cutter grinding machine, the combination of the three slide rests or
plates, two of which are also capable of a rotary or swivelling motion in the
horizontal plane, as and for the purpose set forth..
3. In a cutter grinding machine, the combination with a spindle adapted to
receive the cutter to be ground, of three slide plates or rests two of which are
capable of rotating or swivelling with respect to one another and to the third slide
plate or rest, of a bracket mounted on the top slide plate or rest and carrying
a spindle adapted to carry to grinding wheel or wheels, as and for the purpose set
forth.
4. In a cutter grinding machine, the combination with a spindle adapted to carry
the cutter to be ground and to be driven by any suitable gear, of a horizontal table
capable of vertical adjustment with respect to the said spindle adapted to carry the
cutter to be ground, of a slide rest or plate adapted to traverse the said table at
right angles to the spindle adapted to carry the cutter to be ground, of a plate
pivotted on the said slide plate or rest so as to rotate or swivel thereen and adapted
to carry a bed for a second slide plate or rest, of a second slide plate or rest
adapted to traverse the said bed, of a plate pivotted on to the second slide plate or
rest so as to rotate or swivel thereon and adapted to form or carry a bed for a third
slide plate or rest, and of a third slide plate or rest adapted to traverse the said bed

page_text: and having formed on or fixed to it a bracket carrying bearings for the spindle
carrying the grinding wheel or wheels, all combined arranged and operating as and
for the purpose set forth.
Dated this 13th day of June 1892.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicants.