بس ملحة الحمد لله الصلاة والسلام على رسول الله الطلب الأعزاء السلام عليكم ورحمة الله وبركاته وأهلا ومرحبا بكم في هذا الجسة الثلث من المحور السادس لمدة نظريت الألات والذي بي عنوان جيرس سنجد أن يكون بمفتح some features of Bivalgears Bivalgears are useful when the direction of a shafts rotation need to be changed يكون يمانونهم بالشافة التي يكون بمفتح some features of a shafts that are 90° but can be designed to work at other angles and use the transmetrotary motion between intersecting shafts so here we have intersecting shafts with 90° teeth on Bivalgears can be stride, spiral or high point Hammамен wool Butterfly في العممكات الlaim ومعطونة في المعلومات و some features of warm gears here we have a warm gear system warm gears are used when large gear reduction are needed it is common from a fourth warm gears to have reduction of 20 in to 1 even up to 300 even to 1 or greater so it makes a high ratio of reduction many warm gears have an intersecting property that no other gear set has the warm gear can easily turn the gear the warm sorry can easily turn the gear but the gear cannot turn the warm warm gears are used widely in material handling and transportation machinery, machine tools also in automobiles they are used for transmitting motion between none parallel and none the transmitting shafts