- Joined
- Oct 24, 2013
- Messages
- 149
This is my latest mod to improve the performance of my LMS 3990 Mini Mill. I added 4-1/2 in. CRS hex rods between the reinforced table top [via 1/4X2X2 in. steel angle] & various places on the column. The two on the rear of the column are mounted opposite each other in the holes for the original torsion spindle return spring to help reduce twisting & the two on the sides help reduce swaying. The rod ends are 1/2-20 thread & have left-hand threads on one end so I can simply loosen the lock nuts on the ends & turn the rods one way to lengthen them on both ends or vice-versa.
I also implemented PetCNC's earlier post about shim-free tramming. I trammed the column first then adjusted the length of each rod so the rod ends lined up with the mounting holes before fastening them. I haven't had an opportunity to try it yet but anticipate at least a slight improvement.
I also implemented PetCNC's earlier post about shim-free tramming. I trammed the column first then adjusted the length of each rod so the rod ends lined up with the mounting holes before fastening them. I haven't had an opportunity to try it yet but anticipate at least a slight improvement.