Operation Of Leadscrew Nut, Etc.; Fitting Instructions; Preparing The Lathe - Myford ML7 Instructions For Installation And Operation With Pictorial Parts List

MYFORD QUICK CHANGE GEARBOX

OPERATION OF LEADSCREW NUT, ETC.

ML.7, ML.7-R and SUPER 7 Lathes are fitted with a stop screw to the
leadscrew nut to control the depth of engagement with the leadscrew, and if
your Lathe is not arranged with this feature it
is recommended that you carry out the modifications as shown at Fig. 11
below.
The screw should be so adjusted that there is minimal backlash
between leadscrew and nut but without causing any binding.
Furthermore, we recommend that when the gear box has been Fitted
and lined up, the right hand leadscrew bracket should be dowelled to the
Lathe bed. Please see Fig. 12 below,
Fig. 11. Diagram showing stop screw and spring fitted to leadscrew nut.
Fig. 12. Diagram showing dowelling of leadscrew
bracket.
14
MYFORD QUICK CHANGE GEARBOX
FITTING INSTRUCTIONS Where paragraph numbers are duplicated, The letter
S denotes Super 7 and the letter M denotes ML.7 except as shown below.
For ML.7 Lathe serial number K1087186 and higher numbers ignore ML.7
instructions and treat as though Super 7, e.g. paragraphs 1. 2, 3, 4S, SS etc.
For ML7-R lathe, treat as though later ML7 lathe (K108718B) and higher
numbers, i.e. paragraphs 1, 2, 3, 45. 5S etc.
For Super 7 Lathe SK108891B and higher numbers, packing strip
reference 230 is no longer required and must not be used.
For Super 7 Lathes fitted power cross traverse (SK115830 and higher
numbers) treat as though ML-7. e.g. paragraphs 1, 2, 3, 4M, 5M etc.

Preparing the Lathe

FIG. 13
1 Open changewheel guard. Remove
the changewheel quadrant and change
wheel guard backplate.
Note On earlier ML.7 models it will be
necessary to remove the tumbler
reverse assembly to facilitate backplate
removal.
2 Fit the 24T gear to the tumbler sleeve
gear. Fig. 13.
i
Note A 24T gear in high tensile steel s
provided with each gearbox.
3 Remove the tailstock from the machine
FIG. 14
See notes in heading
45 With the carriage adjacent to the
right-hand leadscrew bracket, engage
the clasp nut to support the leadscrew,
and tighten the clamp bolt at the rear of
the saddle. Fig. 14.
FIG. 15
5S Remove the Simmonds nut, lead-
screw handwheel and driving pin from
the leadscrew. Release the caphead
screws which secure the leadscrew
bracket, and remove the bracket.
Fig. 15.
6S Disengage the clasp nut and with-
draw the leadscrew to the right.
7S Remove the left-hand leadscrew
bracket.
See notes in heading
4M With the carriage near the headstock
end of the bed engage the clasp nut to
support the leadscrew and tighten the
clamp bolt at the rear of the saddle.
Fig- 14, but saddle at other end of
bed.
5M Remove left-hand leadscrew bracket.
6M Remove the leadscrew guard and
shorten to the new dimensions given in
Fig. 16.