Just a curious response from a drop-in to this string: has anyone though about the possibility of a moiré-like pattern -- a beat frequency -- caused by a nonintegral ratio between number of steps in each axis?
Straightening long slender shafts is a tricky business - I spent years in the shockabsorber business as well as using the rod straightening facilities for straightening (lightly) bent motorcycle fork legs bent in racing mishaps. (don't try fixing badly bent fork legs.)
Using a hydraulic bench or arbor press can only get you so far - you reach a point where it will flex and accomplish nothing and then going just a couple of thou further will bend it the other way - often worse than it was.
Ultimately you have to hit it with a soft hammer or lead thumper - use aluminum supports or covers to strike points if using a steel hammer.
Start over the full length - then half and half - go back to full length - repeat until you get 0.001" TIR
Easy if you have the skill - practice on a similar diameter round barstock first just to get a feel for how hard you need to smite it.
Regards, Ken
Just a curious response from a drop-in to this string: has anyone though about the possibility of a moiré-like pattern -- a beat frequency -- caused by a nonintegral ratio between number of steps in each axis?
Hopefully the final update on this. I've installed the new leadscrew, the run-out or sag at the middle is about 0.07mm which is better than the original. I adjusted the half nuts to make sure there is no change or deflection when the nuts are closed. This along with the new adjustable brass gibs on the back and front of the carriage basically fixes the issue. Nice shiny round parts and no visible banding anymore
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