By way of example, In case the nominal value of a shaft intended to suit into a bearing is 20mm, a shaft larger than This may not fit. Therefore, machinists only allow the deviation for such a shaft around the more compact side. Precision machining, through CNC turning and milling, https://metalworkingmachines33085.humor-blog.com/30960717/getting-my-cnc-machining-centers-for-sale-to-work