Choosing the Right Motor

I'm building a concave cutter. (Or I'm trying to build one.)

But I'm having trouble choosing a motor for the cutter.

I'm shopping for a reversible DC motor, but I don't really know how much torque I need.

I've been looking at torque conversion tables, but I'm a bit overwhelmed.

I'm planning on buying this motor: https://www.oyostepper.com/goods-1465-Oukeda-PM-Permanent-Magnet-Linear-Stepper-Motor-15-Deg-023A-4-Phase-%CE%A625x16mm.html

Will this be enough or will it be overkill?

Thanks in advance for your advice!