You get what you pay for. There are ball screw sets out there that at "rolled" and others that are "ground." Check to specs to see how accurately they have been made which sldo means how accurately they will make parts. This assumes rotary encoders on the motors vs linear scales on the table.
Ball screw conversions are very common on series 1 machines. If you have ever ran one, they are slick! Be carefull when climb milling though, the machine will have a tendency to run away. But I have NOT seen a series 2 conversion and I have serviced Bridgeports for 23 years. It may exist but demand would be very low and thus pricing high. The old Bridgeport NC2s had ball screws on the X, Y, and knee. The Series 2 Specials sold by Bridgeport as the EZTRAK 2 has ball screws on the X and Y and on the quill if it is the 3 axis version. What you are trying to do may not be practical. But good luck!
George W. |