I am designing a CNC for light aluminum work. I have made 5 examples and cannot figure out which one to use. It's my first build/revision for all 5 of them. I like V5 the most, but it's probably the least strong of them all (Next would be V2).
To increase rigidity you must decrease torque where linear guides mount to frames. You also need to increase the distance between two sides of structural beams. What this translates to is reducing the total distance between the cutter and the X axis rail as much as possible, it also means the further apart the top extrusion is from the bottom one on either side of the ball screw the better for rigidity. Finally and most obviously, 40mm is better than 30mm or 20mm. You'll need to take a closer look at your drawings to determine which best fits these descriptions, and weigh it against carriage mass and cost.
if u make a cnc to look nice and have no utility , then u can use the most beauty contest components , but if u make a cnc to work with it , u need to make it the most stiffnes u can achieve with stock u have .
I don't think any of them will be much good for aluminium. For wood and plastics, maybe OK. For 3 mm cutters, maybe.
The root of my dislike is the weakness and flex in all those aluminium extrusions. They are just not strong enough.
CNC X Axis Opinion
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