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Possibilities for programming CNC lathe SP280SY.
Vondrák, Jan ; Kalivoda, Milan (referee) ; Polzer, Aleš (advisor)
Bachelors thesis is devoted on the shop oriented programming parts with numerical controlling system Sinumerik 840D. The first part includes analysis possibility shop oriented turning. Next part includes program of designed rotary part in ShopTurn with description used technology and graphic compare with programming in contours editor EMCO WinNC in system Sinumerik 840D and quantifier differences reach mechanical times at application instrumental equipment two producers. Final part includes technical documentation of designed rotary part and instrumental equipment.
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New model of precession, valid in time interval 400 thousand years
Vondrák, Jan
New model of precession, expressed in terms of long-periodic trigonometric functions of time is developed, based on numerical integration of motions of the Solar system bodies. Its validity is +/- 200 thousand years from the basic epoch J2000, with the accuracy below one milliarcsecond in the central part and gradually decreasing to a few arcminutes towards both ends of the interval of validity.
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