Does anyone have any information or ideas on making a parallellagram style of manual tracer/copier for a plasma setup. I can't afford a CNC table but want the ability to trace a template and then have it scaled for the tourch thru a set of articulating arms. Seems I remember a set of adjustable linkages that articulated so one end follows the other but can't think of the name for the life of me. All I can think of is the spring loaded boxing gloves in cartoons. This is something I want to make with adjustment so on one side can be traced and the other side can be scaled for the plasma gun to cut out 2x size (or 1/2 size). I will figure out how to turn on the gun etc. just need help with the linkages.

Thanks in advance.