Installation - Myford ML7 Instructions For Installation And Operation With Pictorial Parts List

MYFORD QUICK CHANGE GEARBOX
The SELECTOR (1) selects any one of the eight ratios available
from the 'cone' of gears on the lower shaft. The indexing position
of the lever is always directly below the column on the chart which
contains the thread or feed desired. (See Fig. 7).
To move the Selector it is necessary to pull the knob forward
bears against the slide provided underneath
and lift the lever until it
slide sideways to the desired position.
the cover plate, then
provides three variations of the ratio selected
The LEVER (2)
the selector (1). The position of the lever (2) is indicated on the
chart to the left of the line which contains the thread or feed
desired.
The REVERSIBLE CLUSTER GEAR (3) is changed (i.e. the
Cluster Gear is mounted with the 57T or larger gear innermost)
select the range of fine pitches. (See Figs. 8, 9 and 1D).
Reversal of Cluster Gear (3) is permitted by the Swinging
Latch which retains the Cluster Gear.
NOTE:
The TUMBLER REVERSE LEVER (4) must be set to the neutral
position, to allow easy meshing of the Cluster Gear with the adjacent
gears
on the quadrant.
The QUADRANT CLAMP (5)
alignment of the quadrant gears with the WHEEL ON THE TUMBLER
CLUSTER.
FIG. t
o 8
by
to
permits adjustment of the
MYFORD QUICK CHANGE GEARBOX

INSTALLATION

The MYFORD Quick Change Gear Box can be easily fitted to
the Lathe if the following instructions are carried out.
The Quick Change Lathe r e q u i r e s a shorter leadscrew than
standard, and whilst this item is available, it is practicable to
shorten the existing leadscrew. The leadscrew guard must also be
shortened on ML.7 machines.
During the past years minor modifications have been carried
out on ML.7 Lathes, for example, the latest changewheel guard
backplate can be removed without disturbing the tumbler reverse
assembly. All except the earliest machines (both ML.7 and Super
7) have been drilled and tapped ready to accept the gearbox.
The part numbers referred to in the FITTING INSTRUCTIONS
are those used in the PICTORIAL PARTS LIST.
IMPORTANT. It is essential that
carefully adhered to, and in particular that the GEARBOX AND
TRANSMISSION MECHANISM SHALL ROTATE WITH COMPLETE
FREEDOM.
MISALIGNMENT OF LEADSCREW OR TIGHTNESS IN ANY OF
THE BEARINGS (GEAR TRAIN-GEARBOX-OR LEADSCREW) WILL
LOADS ON GEAR
IMPOSE HEAVY THE
SERIOUS DAMAGE.
After assembly, and before operating under power, the
required freedom should be ascertained in the following
(1) Disengage tumbler reverse.
(2)
Set reversible cluster, 3 Fig. 7, in screwcutting position,
i.e. with smaller gear (19 teeth) innermost.
(3) Set lever, 2 Fig. 7, on top of box, in a position giving
disengagement of gearing.
(4) Set selector, 1 Fig. 7, in 8 T.P.I.
position.
Disengage lead screw nut (clasp nut lever in upper
position).
the 8 T.P.I. threaded portion it should be
(A) Gripping on
possible to rotate the leadscrew.
Gripping the 72 tooth wide input gear it should be
possible to rotate the input drive
the box.
9
the following
instructions are
TRAIN AND MAY LEAD TO
manner:-
gearing and the gears in