I’ve been updating by MPCNC to the 525 mod with the T8 lead-screw and a anti-backlash nut
The neck and spring on the anti-backlash are thicker than the standard nut and I don’t think there is enough material left in the C-XYZ-T8 to open up the bore to swallow the anti-backlash nut. I wound up just flipping it around. There does not seem to be a lot of wall thickness in the C-XYZ-T8 component and I thought it would be less prone to failure if I put it in compression. I re-modeled the C-Spacer in FreeCad so I could use M3X40 cap screws with self-locking nuts.
One problem that I had was that heads of the M3 bolts semi-interfered with the spring. I found a washer in my junkbox that fit nice over the nut and seated over the cap screws. It seems like this should work.
The T8 lead screw I bought off amazon came with the coupling and bearings with flanges Originally I was just going to with the MPCNC stock bearing assembly but I was having a problem fitting lead-screw through bearings. So I think I’m going go with the flange bearings.
At this point, I’m inclined use the flange bearings that I got off amazon. whats sort of neat about them is that the bearing ID is extended and has two set screws to secure the lead screw. I’m thinking that this will take the thrust load off the z stepper motor…
At this point, I’m thinking my next steps are to:
Redo and extend the z-axis pipe to accommodate the length of the T8 lead screw.
Mod C-Z_lower to accept the flange bearing.
Either Flip C-Z_lower and use the existing C-ToolMount (which is easy but might cause some clearance issues for my router) or mod the C-ToolMount to have a pad to mount the lower bearing (but that’s a lot of work for me to reverse engineer.)
This is still a work in progress.
Any thoughts, would be appreciated.