A New or Improved Machine Tool particularly applicable for Refacing or Turning Commutators of Electric Generators and the like.
Year: 1899

page_text: Date of Application, 24th Feb., 1899
Complete Specification Left, 24th Nov., 1899-Accepted, 24th Feb., 1900
A New or Improved Machine Tool particularly applicable for Refacing
or Turning Commutators of Electric Generators and the like.
I, DAVID HONEYWOOD, of Grove Works, Harleyford Road, Vauxhall, London,
S.W., Engineer, do hereby declare the nature of this invention to be as follows:-
Heretofore machines for turning, grinding or truing up the face of electric
commutators for example, have been heavy, complicated and faulty in their
design inasmuch as one has been unable to deal with the entire surface between
the Hanges of such, much difficulty and inconvenience being experienced when
nearing said flanges especially when the working surface of the commutator is
much smaller in diameter thereby producing a deep flange. Furthermore such
machines have hitherto been very expensive.
The object of my present invention is to so construct a machine to overcome these
difficulties and produce a more useful and inexpensive article.
For this purpose I construct the machine as follows:-
To a base, which forms an adjustable clamp by which the machine is fixed to
the bedplate of a dynamo or the like, I fix to or form part thereof, a bearing
within which is mounted a bar or barrel of circular section hereinafter referred to
as the barrel. Upon this barrel I mount or clamp two standards carrying bear-
ings which bearings are made capable of being raised or lowered according to
required circumstances; within these two last named bearings rotates or is
mounted the spindle, upon the overhanging end of which is fixed the emery
wheel whereby the truing up is to be effected. The bearing nearest to the emery
wheel has placed between it and the clamp or slide connection with the barrel
an ordinary V slide and screw by which it can be traversed across the aforesaid
barrel thereby providing an efficient means for regulating the cut with which it
is desired to work. These bearings as before stated are capable of adjustment,
being made with a telescopic or socket fixing interposed between them and the
barrel; the clamps or fixings to the barrel are kept in line by means of two
feathers or keys (held within them) which are fixed in a keyway or groove by
means of set screws when and where desired.
The aforesaid barrel is provided with a U shaped slot longitudinally therewith
within which is fixed a screw by means of which the bearing and standard carry-
ing the emery wheel are traversed to and fro on the barrel; a semi-nut being
provided within the cap or lower half of the clamp which embraces the barrel.
The outer end of the aforesaid screw is supported by means of an adjustable
column from the floor, this column is preferably provided with an adjustable stay
by means of which rigidity of the overhanging part of the machine is ensured.
It will be obvious that the spindle carrying the emery wheel must be provided
with a long key-way or groove so as to enable said spindle to pass through the
driving pulley of the machine which pulley is held next to the opposite bearing.
When commutators are very badly worn it is sometimes found a convenience
to substitute for the emery wheel a milling cutter or sometimes I dispense with
the spindle and bearings and substitute therefor, in the standard ordinarily used

page_text: for carrying the bearing next to the emery wheel, a cutter-holder within which
is fixed any ordinary turning tool the traversing motion being effected by the
same means as that already described for the emery wheel, the ordinary V slide
serving for regulating the cut.
The machine may be driven from any suitable source but I sometimes provide
an electric motor therewith for the purpose. A convenient method of fixing
same is as follows:-To the driving end of the barrel I clamp or otherwise afix
a bracket by which the motor is carried. This necessitates the motor being
comparatively near to that part of the machine to be driven so to lengthen the
drive sufficiently to ensure proper driving power. I provide on this bracket a
standard or column to which is fixed guide pulleys over which the belt passes on
its way to the driving pulley.
It will be obvious that by a similar contrivance the machine could be driven
from the dynamo itself.
Dated thin 92nd day of Tahmiami AD 1900.
A New or Improved Machine Tool particularly applicable for Refacing
or Turning Commutators of Electric Generators and the like.
I, DAVID HONEYWOOD, of Grove Works, Harleyford Road, Vauxhall, London,
S.W., 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: —
Heretofore machines for turning, grinding or truing up the face of electric
commutators for example, have been heavy, complicated and faulty in their
design inasmuch as one has been unable to deal with the entire surface between
the flanges of such, much difficulty and inconvenience being experienced when
nearing said flanges especially when the working surface of the commutator is
much smaller in diameter thereby producing a deep flange. Furthermore such
machines have hitherto been very expensive.
The object of my present invention is to so construct a machine to overcome these
difficulties and produce a more useful and inexpensive article.
For this purpose I construct the machine as follow:-Reference being had
to the accompanying sheet of drawings in which Figure 1 represents a front
elevation, and Figure 2 a sectional elevation or end view of a machine constructed
in accordance with my invention.
To a base A, which forms an adjustable clamp A1 by which means the machine
is fixed to the bedplate of a dynamo or the like, I fix to or form part thereof,
a bearing B within which is mounted a bar or barrel C preferably of circular
section, herein after referred to as the barrel. This barrel C is held rigidly in
the bearing B by means of the clamping set screws B. Upon this barrel CI
mount or clamp two standards D and E carrying bearings D¹ and E¹, which bear-
ings are made capable of being raised and lowered according to required circum-
stances, within these two last named bearings D' and E¹ rotates or is mounted
the spindle F upon the overhanging end of which is fixed the emery-wheel .G
whereby the truing up is to be effected.
Interposed between the bearing E¹ and the clamping device E2, which forms
the sliding connection of the standard E with the barrel C, is placed an ordinary
V slide and screw H by which it can be traversed across the aforesaid barrel C

page_text: thereby providing an efficient means for regulating the cut with which it is
desired to work.
The bearings D¹ and E¹ as before stated are capable of adjustment being pro-
vided with a telescopic or socket attachment D3 and E³ interposed between them
and the barrel C, the clamping devices D2 and E2 or attachments to the barrel C
are kept in line by means of two feathers or keys K (held within them) which are
fixed in a keyway or groove C₁ by means of set screws or otherwise when and
where desired.
The aforesaid barrel C is provided with a U shaped slot L extending longitu-
dinally therewith, within which is fixed a screw M by means of which the bear-
ing E and stanard E carrying the emery wheel G are traversed to and fro on the
barrel C to the desired extent of the width of the surface to be operated upon:
a semi-nut E being provided within the cap or lower half of the clamp E2 which
embraces the barrel C. The outer end or overhanging portion of the aforesaid
barrel C carrying the screw M is supported by means of an adjustable column N
resting on the floor, this column N is preferably provided with an adjustable stay
by means of which rigidity of the overhanging part of the machine is insured.
It will be obvious that the spindle F carrying the emery wheel must be pro-
vided with a long key way or groove FI so as to enable said spindle F to pass
through the driving pulley O of the machine which pulley is held next to
the bearing D.
Interposed between the bearing D¹ and the clamping device D2 I provide, in
place of the V slide and screw as in the opposite end of the machine, a pair of
Tslots P within which T bolts P¹ are free to slide to and fro crosswise of the
barrel C which affords a ready means for roughly adjusting this end of the
machine in alignment with or parallel to the axis of the surface to be operated
upon.
When commutators are very badly worn it is sometimes found a convenience
to substitute for the emery wheel G a milling cutter or sometimes I dispense with
the spindle F and bearings D1 and E' and substitute therefor, in the standard E
ordinarily used for carrying the bearing E¹ next to the emery wheel G, a cutter-
holder within which is fixed any ordinary turning tool, the traversing motion
being effected by the same means as that already described for the emery wheel,
the ordinary V slide H serving for regulating the cut.
The machine may be driven from any suitable source but I sometimes provide
an electric motor therewith for the purpose. A convenient method of fixing same
is as follows: To the driving end of the barrel, that is to say the end support-
ing the bearing D¹ carrying the driving pulley O, I clamp or otherwise afix a
bracket not shown in the drawings by which the motor is supported or carried.
This necessitates the motor being comparatively near to that part of the machine
to be driven so to lengthen the distance between the driving and driven centres
and insure an efficient driving power I provide on this bracket a standard or
column to which is fixed guide pulleys over which the belt passes on its way to
the pulley O driving the machine. It will be obvious that by a similar con-
trivance the machine could be driven from or by the dynamo itself.
Similar letters of reference relate to like parts of the drawings.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. In a machine tool for refacing or turning commutators or the like the
employment of a barrel upon which is adjustably mounted standards and bearings
carrying a spindle upon which is fixed an emery-wheel, milling cutter or its
equivalent substantially as and for the purpose specified.
2. In a machine tool for refacing or turning commutator faces or the like, the
employment of a barrel upon which is adjustably mounted standards, carrying
a spindle, within which rotates an emery wheel, said barrel being provided with

page_text: a slot within which is fixed a screw and nut for the purpose of enabling said
emery wheel to be traversed to and fro, parallel to the surface to be operated
upon substantially as described and illustrated in the drawings.
3. In a machine tool for refacing or truing up commutator surfaces and the
like the employment of a barrel upon which is mounted adjustably an emery
wheel, milling cutter or tool holder, having interposed between it and the barrel
means for regulating the cut operating substantially as described, and for the pur-
pose specified.
D. HONEYWOOD,
Applicant, Grove Works, Harleyford Road, Vauxhall, S.W.