My MPCNC is unfortunately suffering some major endmill chatter. The endmill chatters hard during cuts, is clearly bouncing around, and I am pretty sure it is due to an excess of machine flex. Here are my specs:
Build Size: 460mm X, 980 Y.
Conduit Size: 3/4 ID (0.922 OD) Conduit.
I have tried the following:
Belts are tight
All bearings are making good contact with their tubes
Noticed some cracks in the Top_Corner pieces, so I printed new ones and made sure they were snugged down
No obvious jiggling or looseness in any of the parts contacting the metal.
Motor mount has no looseness, seems to be held sturdily in place.
Alas, I am getting some major chatter. The chatter seems to vibrate through the mount and throughout the X and Y gantry tubes. On further inspection, I seem to be getting quite a bit of flex in my Y axis center tube (960mm length). It is fairly easy to flex and I believe this may be causing the chattering, or at least allowing it to happen.
I am in Canada and am using Columbia EMT, I believe its one of the only brands that are sold (every major chain does just that kind.) Does EMT vary from bar to bar in terms of stiffness or rigidity? Am I screwed? Is there anything else I can look for to solve this problem?