Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Stephen Albert Tobias"'
Publikováno v:
International Journal of Machine Tool Design and Research. 23:39-51
An electromagnetic pulse excitation technique for the determination of receptance data is presented. The relative performance of this in relation to the conventional stepped and swept sine methods was established in tests carried out on a horizontal
Publikováno v:
Journal of Engineering for Industry. 105:187-196
The dynamic behavior and the cutting performance of a horizontal milling machine, the structure of which was fabricated by bonding, are compared with those of a machine of nominally identical specification but containing cast structural components. T
Publikováno v:
International Journal of Machine Tool Design and Research. 19:237-252
A theoretical analysis is given of the dynamics of a single-acting impact forming machine with the aim of establishing the relationship between the efficiency of energy transfer and that of the clash load and the machine/process parameters. The machi
Publikováno v:
International Journal of Machine Tool Design and Research. 16:301-318
The noise generated during an upsetting process on a laboratory drop hammer is measured, analysed and predicted from first principles. The theory developed relates the modes of vibration of the hammer structure with the noise perceived by an operator
Publikováno v:
International Journal of Machine Tool Design and Research. 15:129-152
The dynamic conditions arising in a particular high speed cropping machine are investigated with the aim of establishing the basic design parameters for a larger improved version. The dynamics of the cropping process is investigated with the aid of a
Autor:
Stephen Albert Tobias, H.M. Shi
Publikováno v:
International Journal of Machine Tool Design and Research. 24:45-69
A non-linear theory of machine tool chatter is presented. It is shown that even when the machine tool structure is linear or only slightly non-linear (as appears to be the case), large non-linearity is introduced by two causes. Firstly, by the chatte
Publikováno v:
International Journal of Machine Tool Design and Research. 17:1-18
A dimensional analysis is presented of the orthogonal steady state metal cutting process. This yields explicit mathematical expressions for the chip thickness ratio, the force ratio and the termination of the built-up-edge in terms of the rake angle,
Publikováno v:
Journal of Engineering for Industry. 98:919-929
Machine tool chatter is essentially a statistical phenomenon. The dynamic characteristics of machine tools as well as the dynamic coefficients of the cutting process are statistical quantities which show scatter when determined in repeated tests. The
Publikováno v:
International Journal of Machine Tool Design and Research. 20:9-24
The reliability of the finite element prediction of the compliances of machine tool structures is investigated, with special reference to grinding machines. The structural model used assumes that the machine subassemblies are rigidly connected with e
Autor:
Stephen Albert Tobias
Publikováno v:
International Journal of Machine Tool Design and Research. 25:105-197
Of the many HERF hammers developed in the 50's and 60's three types have survived: Dynapak, CEFF and Petro-Forge. Dynapak and CEFF machines are pneumatically actuated devices. They continue to be used in industry, having found a segment of the market