ðə ʃˈæft ˈɔːlsoʊ ɹoʊtˈeɪts ðə sˈʌbstɹeɪt æɾə pɚtˈɪkjʊlɚ spˈiːd sˌoʊ ðætðə fˈɪlm ɪz jˈuːnɪfˌɔːɹmli dᵻpˈɑːzɪɾᵻd ɔnðə sˈʌbstɹeɪt.
The shaft also rotates the substrate at a particular speed so that the film is uniformly deposited on the substrate.