Most bridgeports only have 1.5 hp motors for their mills so 1.5 hp is all you need. Also you will have to deal with the extra weight of the bigger motor on the mill head. The 3 phase motors are lighter than the single phase ones that I used. I went with the 1.5 hp so I could use 110volt single phase input on the VFD drives. If you go more hp you have to go up to 220 single phase. Thats where the cutoff point is. The lathe can handle more HP and it might be an advantage in some machine operations. As for the mill spindle bearings their is nothing for the bottom bearing to catch on it comes straight out the bottom of the spindle. It is just a piece of junk and should always be replaced if you are serious about your machine and a VFD drive is only for the serious user. |