Hi there,
I'm fairly new to the CNC world and currently in the process of constructing my own CNC Mill. I'm using a Box steel frame filled with epoxy granite or concrete; I haven't decided yet. Right now, my main focus is on designing the frame, specifically the X-axis. I'm drawing inspiration from the Grizzly G0759, but I'm building the frame from scratch and opting for linear rails instead of dovetails.
As I explore various DIY CNC mills online, I've noticed a common approach where the rails are fixed and not moving in the X-direction, but only the bearing blocks move. Similar to what Seabass Engineering does in his build: link. I hope it is clear what I'm trying to say; English is not my first language.
I'm grappling with the decision on the best design option. Initially, it seems that the first approach might offer more rigidity. The spindle always stays in the middle of the bearing blocks, ensuring maximum rigidity, and it could potentially allow for longer travel with the same length of rails since the bearing blocks don't need to be as far apart.
However, I can't help but wonder why this design choice isn't more widespread. Am I missing something crucial here? I'd greatly appreciate any advice or insights you might have on this matter.
Thanks.