1. Lub tshuab txais yuav nrog synchronous siv tsav thiab tawv iav lub ntsej muag iav lub thawv.Lub thawv iav txais yuav nrog synchronous siv tsav txhua pawg luam ntawv siab precision planetary iav qhov cub (360º kho lub phaj)
iav tsav lub xovxwm luam ntawv roller (tuaj yeem luam tawm ob sab hloov dua siab tshiab).
2. Tom qab luam ntawv, qhov chaw ua haujlwm ntev, nws tuaj yeem ua rau tus number case kom qhuav yooj yim, zoo dua.