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Principles and applications of spark machining
VOL.2 (1958/59)
LITERATUREAND CURRENTEVENTS Authors’
2.37
Abstracts
Note on the Wear of Teflon Sliding on Teflon
D. G. FLOM (General Electric Research Laboratory, Schenectady, New York) J. AppZ. Y&s., 28 (1957) 1361; (I fig., z ref.). Short note: load 108 g, speeds 95 and 189 cm/set. Initial wear rate 7.10-~ cma/cm, independent of speed.
Abrasion of the Insect Cuticle by Aqueous Suspensions of Small Particles
V. B. WIGGLESWORTH(Agricultural Research Council, Unit of Insect Physiology, Depart of Zoology, University of Cambridge) - Nature, 181 (1958) 780; (I fig., 5 ref.). Abrasion produced by drying suspensions ot hard particles on surface of cuticle. Extensive
abrasion was revealed by silver staining.
Principles and Applications of Spark Machining
D. W. RUDORFF-Proc. Inst. Mech. Engrs. (Lolzdort), r71 (14) (1957)495-511; (26fig., 15 ref.). The historical background of electro-erosion technique is briefly outlined and the difference between spark and arc discharges is defined. The underlying principle of the relaxation-type spark circuit as employed in industrial machines is explained, and development trends are discussed. The various factors bearing upon the efficiency of spark-erosion operations are enumerated. The mechanical features of a typical spark-erosion machine are described, and the range of machining operations for which spark cutting machines can be designed, is outlined. Typical samples of work produced on a commercial unit are described and illustrated, spark-machined surfaces are discussed.
and the properties of
The Friction of Wood
D. ATACK (Pulp and Paper Research Institute of Canada) and D. TABOR (Research Laboratory on the Physics and Chemistry of Solids, Department of Physics, University of Cambridge) - Proc. Roy. Sot. (London), A, 246 (1958) 539-555. Earlier work, especially on metals, has shown that the friction of unlubricated solids is largely due to strong adhesion occurring at the regions of real contact; in addition part of the friction may arise from the ploughing of the softer surface by asperities on the harder. This paper shows that the friction of wood may be explained in a similar way, that is, it arises from an adhesion term and a deformation or ploughing term. In particular, it is found that the moisture content may have a profound effect - not necessarily a collateral one - on each of these terms. The friction was studied between balsam wood (Abies balsamea) and surtaces of
LITERATUREAND CURRENTEVENTS Authors’
2.37
Abstracts
Note on the Wear of Teflon Sliding on Teflon
D. G. FLOM (General Electric Research Laboratory, Schenectady, New York) J. AppZ. Y&s., 28 (1957) 1361; (I fig., z ref.). Short note: load 108 g, speeds 95 and 189 cm/set. Initial wear rate 7.10-~ cma/cm, independent of speed.
Abrasion of the Insect Cuticle by Aqueous Suspensions of Small Particles
V. B. WIGGLESWORTH(Agricultural Research Council, Unit of Insect Physiology, Depart of Zoology, University of Cambridge) - Nature, 181 (1958) 780; (I fig., 5 ref.). Abrasion produced by drying suspensions ot hard particles on surface of cuticle. Extensive
abrasion was revealed by silver staining.
Principles and Applications of Spark Machining
D. W. RUDORFF-Proc. Inst. Mech. Engrs. (Lolzdort), r71 (14) (1957)495-511; (26fig., 15 ref.). The historical background of electro-erosion technique is briefly outlined and the difference between spark and arc discharges is defined. The underlying principle of the relaxation-type spark circuit as employed in industrial machines is explained, and development trends are discussed. The various factors bearing upon the efficiency of spark-erosion operations are enumerated. The mechanical features of a typical spark-erosion machine are described, and the range of machining operations for which spark cutting machines can be designed, is outlined. Typical samples of work produced on a commercial unit are described and illustrated, spark-machined surfaces are discussed.
and the properties of
The Friction of Wood
D. ATACK (Pulp and Paper Research Institute of Canada) and D. TABOR (Research Laboratory on the Physics and Chemistry of Solids, Department of Physics, University of Cambridge) - Proc. Roy. Sot. (London), A, 246 (1958) 539-555. Earlier work, especially on metals, has shown that the friction of unlubricated solids is largely due to strong adhesion occurring at the regions of real contact; in addition part of the friction may arise from the ploughing of the softer surface by asperities on the harder. This paper shows that the friction of wood may be explained in a similar way, that is, it arises from an adhesion term and a deformation or ploughing term. In particular, it is found that the moisture content may have a profound effect - not necessarily a collateral one - on each of these terms. The friction was studied between balsam wood (Abies balsamea) and surtaces of