The Improved Design
DRUMMOND 3.5-INCH
Centre, Back geared, Self-acting, Sliding
Boring and Screwcutting Lathe.
_______________________________________________
Foreword.
A few words on the origin and development of the Drummond 3.5-in. lathe may be of interest, and will show how uniformly successful this design has been since its first appearance.
The original 3.5-in. centre lathe was introduced in 1902. and was the first lathe of its size designed on really efficient lines. The details of the design were gradually improved in the light of experience with lathes of this type and in accordance with current practice, and in 1912 a revised design, incorporating the results of continuous experiment towards efficiency, was marketed. This model enjoyed even greater popularity than its predecessor.
The lathe was again modified in 1921; the points in design previously found to be most desirable as giving great ease of handling, large scope for varied work, and accuracy in operation being retained, and other features incorporated in the light of further experience gained during and after the war. Here our work on precision screw production and measurement to fine limits had its effect in influencing both design and manufacturing methods. The lathe was made heavier throughout, the round belt was replaced by a flat one, ball bearings were fitted to flywheel and pitman - a special cone lock fitting to headstock - etc., etc.
Design has continued to progress, and details to be improved, and now the modern lathe, complete with the many special features described in this list, can confidently be claimed without hesitation to be in every way the finest and most complete 3.5-in. centre lathe obtainable.
______________________________________________
