A New or Improved Cutting, Milling, or Grinding Machine for Reproducing Articles to Templet.
Year: 1888

page_text: Date of Application, 20th June, 1888
Complete Specification Left, 20th Mar., 1889
Complete Specification Accepted, 25th May, 1889
PROVISIONAL SPECIFICATION.
A New or Improved Cutting, Milling, or Grinding Machine for
Reproducing Articles to Templet.
I, HENRY DAVIDSON, of No. 86, Mayfield Road, Dalston, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the construction of a novel and simple machine whereby
articles of all kinds can be reproduced to templet in a simple and expeditious
manner.
or
My new or improved machine comprises a mandril mounted in suitable bearings
and provided with a circular cutter. On the bed plate of the machine is a holder
"form"
carrying by means of a universal joint, a bar on which is placed a
fac simile of the article to be produced, the feed or traverse of this bar is effected
by means of a screw on the bar working in a nut in the universal joint; the
material from which the article is to be made is carried on the end of the bar.
An adjustable gauge rest is provided on the bed plate against which rest the "form"
is pressed as the work proceeds.
Motion is communicated to the mandril and to the bar by hand or power.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
A New or Improved Cutting, Milling, or Grinding Machine for
Reproducing Articles to Templet.
I HENRY DAVIDSON of 86 Mayfield Road, Dalston in the County of Middlesex
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 invention has for its object a machine for reproducing articles to templet or
model in a simple and expeditious manner.
It is best described by aid of the accompanying drawings, in which
Fig. 1 is a front elevation of the machine.
Fig. 2 a plan thereof.
Fig. 3 a cross section on line A B figure 2, showing the construction of the
universal joint.
Fig. 4 a cross section on the line C D figure 2, showing the templet or model and
the rest by means of which the axis of the mandril is regulated as regards its proximity
to the cutter.
In these, A is the bed plate or framing of the machine, B the poppet head con-
taining a rapidly rotating spindle C, and cutter D; E a pulley for driving the spindle
and cutter aforesaid.
F is a mandril made to receive at one end a cylindrical sleeve G having a screw
thread of suitable pitch cut thereon. This is secured by a feather or its equivalent so
that it rotates with the mandril aforesaid. The screw G can easily be removed so as
to substitute, when required, a screw of coarser or finer pitch.
The screw G is mounted at one end in a universal joint H constructed so as to
allow the mandril F perfect freedom of motion in every direction, within certain
limits. The joint H comprises a holder mounted upon the bed plate A and adjustable
thereon by means of the slots a a and bolt and nut a'. The shank of the gimbal h' is
socketed in the holder and can freely rotate therein. It is retained in the holder by
the set screw 2 which engages a groove in the shank of the gimbal h¹.
A screwed nut 3 having a pitch equivalent to the screw G is pivotted in the gimbal
by the set screws hand receives the said screw. G' is a handle for rotating the
mandril F.
The other end of the mandril F carries a model or "form" J of any suitable shape
and it is supported on the model rest K. k is an angle plate mounted on the bed
plate A to which the model rest aforesaid is secured.

page_text: The article or blank L it is desired to operate upon is attached to the end of the
mandril, and its proximity to the cutter D is regulated by the rest K, which can be
moved back or forth by loosening the nut . The end of the mandril might for
example, be screwed so as to facilitate the attachment of the blank.
In figures 1 and 2 1 is the article or blank which is being operated upon, and is
intended to represent a cork or stopper for bottles upon which a screw thread is being
cut such as is described in the specification of Letters Patent No. 9784 dated
August 18, 1885. I wish it however to be understood that the stopper aforesaid is
only an illustration of what the machine is capable of performing.
The mode of action of the apparatus is as follows;-
The model whose shape it is desired to duplicate is placed on the mandril F and
secured in position by the collars j, the blank to be operated upon is then secured to
the end of the mandril aforesaid. The rest K is adjusted to bring the blank in close
proximity to the revolving cutter D. A screw and nut of suitable pitch are placed on
the end of the mandril F which is a lapted to receive them and the latter is engaged
by the gimbal h¹ of the universal joint. The mandril aforesaid is rotated by the
handle G. When the handle G¹ is turned, the mandril F, model J, and the blank are
rotated, and are moved slowly forward by the screw G. The universal joint H allows
the mandril F sufficient freedom of motion, so that the outline of the model in con-
junction with the rest K guides the blank against the rotating cutter D and reproduces
a duplicate of the model.
The model J is pressed against the rest K while the blank is being operated upon
by the cutter, either by the hand or by any suitable device.
If a screw thread is to be cut upon the blank L, a screw G and nut ³ are employed
having a pitch equivalent to the screw thread it is desired to cut. When the
handle G is rotated and the blank L pressed against the rotating cutter, a spiral
thread is formed upon the blank L. The outline of the model can be reproduced
and the screw thread cut on the blank at one operation, if the cutting edge of
the cutter D is made of a suitable shape such as that shown on the drawings.
The mandril F can, of course, he power driven if desired, instead of being rotated by
hand.
In some cases the screw G might be dispensed with and the mandril
by a plain collar or sleeve pivotted in the gimbal h¹.
supported
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. A machine for reproducing articles to templet consisting of a rapidly revolving
spindle and cutter CD, and a slowly rotating mandril F approximately parallel to the
spindle aforesaid and carrying at one end the blank to be operated upon, and in
proximity to the blank a facsimile the said mandril being moved slowly forward by a
screw such as G supported at its rear end in a universal joint H which allows
sufficient freedom of motion to enable the facsimile or model when pressed against the
rest such as K to guide the article operated upon against the rotating cutter D
substantially as and for the purposes described.
2. A machine for reproducing articles to templet having the combination with a
rotatable mandril F carrying at one end the blank to be operated upon and supported
at the other by a universal joint H of a model or fac-simile blank mounted on the
mandril aforesaid and a rest or tracer K supporting and bearing against the said
model and capable of being moved back or forth so as to adjust the proximity of the
andril to the revolving cutter substantially as described.
3. A machine for reproducing articles to templet having the combination with a
rotatable mandril F carrying at one end the blank to be operated upon, and in
proximity thereto a fac-simile thereof, of a cylindrical screw threaded sleeve such as G
mounted at the other end of the mandril aforesaid, so as to revolve therewith, but
dapted to be easily taken off when required, and replaced by other screws of coarser

page_text: or finer pitch, and a nut such as ³ which receives the said screw and is pivotted in a
universal joint H so that it can be replaced by other nuts having their respective
pitches equivalent to those of the screws employed substantially as and for the purpose
set forth.
4. The machine for reproducing articles to templet combined and arranged as a
whole substantially as described.