Improvements in Capstan or Turret Lathes."
Year: 1897

page_text: "Improvements in Capstan or Turret Lathes."
I DANIEL ORME of 95 Queen's Road, Oldham, in the County of Lancaster, Gas
Meter Manufacturer, do hereby declare the nature of this invention to be as
follows.
My said Invention relates to capstan or turret lathes usually automatic in their
action, in which a capstan or turret is mounted in a bed sliding on the shears,
the said capstan carrying a number of tools which are brought successively into
action so as to machine the job held in the chuck of the fixed head. The said
capstan and its bed occupy the position usually-filled by the movable back centre
head, and consequently the job lacks the support of a back centre, and has to
depend entirely upon the grip of the chuck. In many cases too where the job is
of any length it is apt to yield to the sidelong pressure of the tool towards the
outer end. To obviate these disadvantages I propose to fix a back centre to a
compound or single slide rest, the said. back centre being capable of employment
and adjustment by manipulating the slide rest and without interfering at all with
the capstan head or tools. The said back centre may be clamped in the slide rest
like a tool and may be shaped and adjusted so as to be clear of the capstan tools.
Thus by centreing or countersinking the outer end of the job and bringing the
said back centre into position by cperating the slide rest, the iob may be steadied
and supported so as to overcome the disadvantages set forth. When such a back
centre is used, a chuck to grip the job is not always a necessity, as the job might
also be hung on a centre in the spindle of the fixed or driving head and rotated by
a carrier and driver in the ordinary manner.
:
I DANIEL ORME of 95 Queen's Road, Oldham, in the County of Lancaster, Gas
Meter Manufacturer, 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 and accompanying drawings.
My said Invention relates to capstan or turret lathes usually automatic in their
action, in which a capstan or turret is mounted in a bed sliding on the shears,
the said capstan carrying a number of tools which are brought successively into
action so as to machine the job held in the chuck of the fixed heal. The said
capstan and its bed occupy the position usually filled by the movable back centre
head, and consequently the job lacks the support of a back centre, and has to
Die R71

page_text: depend entirely upon the grip of the chuck. In many cases too where the job is
of any length it is apt to yield to the sidelong pressure of the tool towards the
outer end. To obviate these disadvantages I propose to fix a back centre to a
compound or single slide rest, the said back centre being capable of employment
and adjustment by manipulating the slide rest and without interfering at all with
the capstan head or tools. The said back centre may be clamped in the slide rest
like a tool and may be shaped and adjusted so as to be clear of the capstan tools.
I will now describe my invention more fully with reference to the accompanying
sheet of drawings.
In the said drawings.
Fig. 1 is a front elevation of so much of a capstan or turret lathe as is necessary
to illustrate my invention and showing my improvements applied.
Fig. 2 is a plan and
Fig. 3 is an end view of the back centre secured to one of the slides of the com-
pound slide rest.
The capstan lathe A is of the usual or ordinary construction but is provided in
addition with a compound slide rest B carried on the bed of the lathe.
This slide rest is capable of being readily fixed to the lathe bed by the tail
bolt h and nuts h¹.
b
Upon the top slide a of the slide rest B I bolt or otherwise suitably secure a
bracket or part 6 clearly indicated in Fig. 3.. The work d being operated upon is
carried in a centre e secured to a carrier f rotated by the spindle of the fixed or
driving head C. The work d is centred or countersunk at its outer end and by,
bringing the back centre c into position by manipulating the compound slide rest B
the work is steadied and supported.
It will be noted from an inspection of Figs. 2 and 3 that the shape of the bracket
carrying the back centre e and the method of carrying the same in the slide rest B
readily permits the turret D to be manipulated as to bring the tool g to work upon
the job. By withdrawing the turret 1) by means of the hand wheel d' each or
any of the tools g may be successively brought into action as required.
When such a back centre c is used a chuck to steady the job is not always
necessary, but may be used if desired.
Although I have shown the back centre c applied or secured to a compound slide
rest, a single slide rest or other equivalent appliance may be used to carry the
back centre.
The usual screw chasing apparatus which swings on a shaft at the back of the
lathe may also be used in conjunction with my improved back centre.
Should the nature of the work performed on the lathe at any time not require
the support of the additional back centre the compound slide rest may be readily
removed from the lathe bed.
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.
As an adjunct to a capstan or turret lathe the back centre c carried and operated
by a compound or single slide rest in the manner for the purposes and substantially
as described and illustrated
Dated this 14th day of October 1897.
For the Applicant,
E. K. DUTTON & Co.
· Chartered Patent Agents 5 John Dalton Street Manchester.