My first version will not have the Power Supply that @Gero has, but I have been assuming that the motor Mounts should be designed as the Weak Link / Failure Point.
I got the impression, from @Gero’s description, that his weak point was (unfortunately) the frame itself… resulting in a major repair job.
Others have mentioned the internal failure of the motor gear reduction box… I don’t want that to be my failure point because the Motors are currently hard to come by and I feel that the point of failure/repair could be cheaper than that.
Frankly, I’m surprised that I’ve not noticed more reports of the linkage mounts on the sled being destroyed… maybe the only mode with any real failure risk is the “Pull tight” calibration step?
Has anyone seen structural failure during Milling operations ? or just during Calibration?
Assuming the motor mount is a good choice for failure point, has anone already done the math to figure out a good shear-strength limit for the motor mounts?