Re: Bridgeport Series 1 CNC Questions
Yes, that is Ericson tooling, I have the same on my machine. Looks like #30. NMTB tooling fits, but may require a little trim on the flange. I have not found the tooling to be too rare, I have scrounged about 30 tool holders locally over the years at almost scrap prices. You can also buy it new from Kennametal, but it's a bit pricey.
The options for a controls retrofit are endless. While it's possible to use the original steppers, new closed loop steppers or servos are so cheap today it's really not worth the hassle of using the original steppers. I would look at DMM Tech or Clearpath for motors. I've had good results from both.
Jim Dawson
Sandy, Oregon, USA