What is this mechanism? Help Please.

[MosFetMan]

I picked these three assemblies at the local surplus shop. The steppers are RapidSyn 23D-2102, 6 Wire Unipolar (I suspect). They are marked 5v / 1.8

The Ballscrew or Lead Screw produces exactly 1.25" of linear travel per revolution. I am trying to build a basic PCB router and I am wondering if this assembly has the resolution "as-is" of if I should start looking for a lead screw / ballscrew with more TPI.

Thanks for any help, I'm a CNC newbie
MosFetMan

[LeeWay]

That is a pretty high lead, but may work very well. Microstepping would give you decent resolution I think.
They won't have much travel, but you can design them to get the max and if your PCB's will fit the envelope, I think they would work.
I would give it a shot. You can always modify later if they don't meet your needs.
Small ball screws and precision acme in these sizes are relatively inexpensive.
Welcome to the Zone. I hope to see more of your progress.