Originally Posted by
ofcsilencer
i have looked at building one of these machines for a while, but i am hung up on a few questions i came up with. bare with me i know they are probably very easy questions......
resolution - what actually sets the resolution of the router. something has to know the conversion to how many rotations of the servo/stepper are required to move the axis one inch. i used one of the preassmebled units from denver very briefly but i didn't see how it actually knew how big an inch was. is this preset in the software, set in the controller, or some specific gear ratio with the drive screws.
anti-backlash nuts - my understanding how ever wrong it may be is that these are used to stop shock forces from tearing up the machine, wouldn't this degrade the accuracy of the servo?
connections - do any of these machines / interfaces connect with anything newer than parallel or serial?
stepper/servo size - how do you determine the size of the servo needed. i noticed harbor freight has a few small cnc machines for a few hundred bucks. i also looked into buying the parts to assemble one but i wasn't sure what size servos i would want or how to determine the necessary size.
stepper/servo speed - this isn't really important since i really just have to watch but im assuming the motors have a higher chance of error at the higher rates of speed depending on the material.
well those are my questions im sure i have the idea all wrong but im hoping someone will point me in the right direction