RRC[

Rat Rig Community [Unofficial]•3y ago•

26 replies

ptegler

A resonance study - test series

...was having an alternate conversation and a few points were brought, correcting my (misguided?) insight that was based on what i'd been seeing in my setup.

So off i went to run a bunch of tests. Using my scale pull test to set a calibration point on my meter I set my belt tensions to 1 lbs, 2 lbs, 5lbs, and 10 lbs. running belt tension tests ate each tension. 'THE' tuning video says you should have two peaks per belt tension. BUT... I'm now running into manufacture specs vs end user prescriptions that do not agree. At 1-2 lbs, I kind of get a sloppy graph with a second peak for each belt. but I can watch the belts vibrate badly and slap the frame and even the gantry on this VC500 at those low tensions. At 5lbs (which is still well below the manfuactures suggested tension) I get one sharp peak, and no secondary peak as the video suggests.
At 5+lbs, (apparently I was running at around 6.5 lbs) is my highest acceleration suggestions when running input shaper.

So my conundrum now is which do I follow. The mfr spec, or the wisdom of those that have gone before me, and the rest of the masses.
examples follow...left is two lbs, right is five lbs of tension