Improvements in Boring Bars.
Year: 1896

page_text: Date of Application, 15th July, 1896
Complete Specification Loft 31st Oct 1896 Accented 12th Dec. 1896
Improvements in Boring Bars.
WILLIAM HENRY TURTON 42 Heavitree Road Plumstead Kent Chief Foreman
Royal Gun Factories Woolwich Arsenal do hereby declare the nature of this invention
to be as follows:-
The boring bar is a hollow tube with a detachable (head or tool-holder), the head is
attached to the bar by a square double thread of coarse pitch cut on the shank of the
head; the head being eccentric with the bar so as to give plenty of space for the
shavings or cuttings.
The boring cutter is fitted into a pocket in the head at an angle of 45° degrees
with the axis of the bar. A small tool V shaped at the cutting point is fixed in the
face of the head for the purpose of cutting one or more grooves in the face of the
steel forging which is to be bored, now when the boring cutter commences to cut,
the shavings come away in two or three pieces, this facilitates their removal from the
bore by water pressure, the water passing through the hollow bar directly on to the
boring cutter thereby keeping the (tool or cutter) cool, lubricating the head and
washing away the shavings.
Dated this 13th day of July 1896.
WILLIAM HENRY TURTON.
Improvements in Boring Bars.
I WILLIAM HENRY TURTON of 42 Heavitree Road Plumstead in the County of
Kent and Chief Foreman in the Royal Gun Factory Woolwich 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 object of my invention is to bore long holes in solid steel or wrought iron
forgings and to overcome the difficulties of the cuttings jambing and causing raking
and frequent withdrawals and renewals of cutters and burnishers.
The bar consists of a hollow tube or any other shape fitted with a detachable head
or tool holder which travels endways for "feeding" while the forging to be bored
revolves. The bar or tube is screwed into or onto the shank of the head or may be
socketed plain with a cotter.
The bar is eccentric with the hole to be bored so as to allow more room for the
shavings to be washed away.
The head is fitted with two or more hardened steel burnishers or bearing pieces.
The boring cutter is fitted into a pocket in the head at an angle of about 45 degrees
to the axis and without set screw or wedges, sometimes packings are required.
A small dividing cutter with V shaped point is fixed in the face of the head and is
adjusted by a screw for cutting one or more grooves in the face of the forging (which
is being bored) and in advance of the main cutter so that the shavings or cuttings are

page_text: broken up into pieces which fall down and are washed away down the bore by a
strong force of water or soap and water supplied through the centre of the bar.
The water is conducted into the bar by a flexible hose pipe or through a fixed gland
and stuffing box into which the bar or pipe slides.
The continual flow of water keeps the cutters and burnishers cool and washes the
cuttings away.
DESCRIPTION OF DRAWINGS.
Fig. 1, is a lengthway section.
Fig. 2, is a side elevation.
Fig. 3, is an end view of the head.
Fig. 4, is a view of the dividing cutter.
Fig. 5, is a dividing cutter. for two, grooves.
Fig. 6, shows the. groove as. cut in the face before. the main cutter. has commenced
to cut.
The same letters indicate like parts.
A is the bar or tube. B is the head. CC are the burnishers or bearing. pieces.
D is the main boring cutter. E is the dividing cutter. F is the flexible water pipe.
G'is a fixed gland and stuffing box.
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.
The eccentric hollow boring bar with cutters arranged for breaking up the cuttings
and washing them away substantially as described and set forth.
Dated this 31st day of October 1896.
W. HUDSON,
53 Ellescombe Villas, Charlton, S.E., Agent for the Applicant.