email: tony@lathes.co.uk
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Myford Super 7 Plus "Big Bore"
Photo Essay
Myford Home Page  Myford Super 7




Although designed in the late 1950s, it was not until the Summer of 2001 that the last (Mk. 3) version of the Super 7 lathe was introduced. Although the garish colour scheme might not have found universal approval, the machine was welcomed as a long-overdue development of this classic lathe: it had a larger and stiffer spindle able to pass a 1-inch diameter bar (formerly limited to 0.75"), a M42.5 x 2 mm pitch nose and a 4 Morse taper socket. The greater convenience of the larger bore, the ability to carry a 5-inch diameter chuck and the increased mass of the headstock casting all contributed to a markedly-improved model. Another significant and important change was made to the countershaft unit - the 2-step motor-to-countershaft belt and pulleys were changed to a Poly-V type giving much smoother running on top speed (a feature often lacking on earlier models) and extended belt life. However, on the ordinary "Big Bore" the drive from the countershaft swing-head to the spindle remained as before - a standard A-section V-belt that could be expected to give years of reliable service. To improve the feel of the cross-feed when using hand feed a needle roller thrust bearing was fitted to the cross-slide end bracket. The opportunity was also taken to improve the security and safety of the changewheel and countershaft belt guards - the inner and outer out sections were made much thicker and fitted with positive-action, 1/4-turn catches to replace the former rather weak spring-held closures that could easily be knocked open by a light blow in the right direction.
Fitted with numerous extras as standard, the top-of-the-range version was given the slightly embarrassing title of  "Connoisseur". This version featured an inverter-controlled, variable-speed drive from 26 to 3000 r.p.m. , a spindle clutch, screwcutting gearbox, hardened bed, spindle indexing (by use of the backgear bullwheel), Poly-V drive to the headstock spindle and ready-mounted on the late-type industrial stand. Another small but useful option was introduced concurrent with the Plus models, a micrometer collar on the tailstock spindle..

An immaculate, privately-owned Myford Super 7 Plus

To take advantage of the improved clearance through the spindle a 5-inch diameter chuck was fitted as standard.

Poly-V drive from motor to countershaft and (as before) an ordinary A-section V-belt to the spindle

Poly-V drive from motor to countershaft. Late-models lathes had a steel instead of (easily distorted) aluminium motor pulley

Note the pressed-steel bracket to take the changewheel guard locking mechanism

The Norton-pattern screwcutting and feeds gearbox held hardened and ground gears running in an oil bath

Power-feed apron complete with Euro-neurosis full-disc safety handwheel

Chemically-blacked fastenings persisted to the end

A feature of all late-model Myford Series 7 lathes, all the carriage components were fully machined

Standard-fit long T-slotted cross slide. The bolt head on the saddle wing is the carriage lock - a proper handle would have been appreciated

Graduated handle to the leadscrew end - a standard fitting on Super 7 lathes from the very first made

On modern motors the cheap plastic capacitor covers can rattle. Padding them out with strips of felt or cloth is a good idea

Rear view showing the line of tapped holes along a machined section of the bed to allow the fitting of a taper-turning attachment

Three lubrication points for the tailstock spindle and its feed screw

Another improvement - a graduated micrometer handwheel to the tailstock spindle

The large-bore spindle and heavier changewheels guard cover are clearly evident

Long an (expensive) option on Myford lathes, the hardened bedways promised a greatly lengthened life




email: tony@lathes.co.uk
Home   Machine Tool Archive   Machine-tools Sale & Wanted
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Myford Super 7 Plus "Big Bore"
Photo Essay
Myford Home Page  Myford Super 7