I'd try the easiest thing first.
Never had it go back and forth, but have had it act like it had hit a hard stop and shudder in place while #s climbed.
Unplug machine and computer from power/leave for a few minutes/replug and start Desktop and then computer and SB3.
During power down blow out all USB connections and check wires for abrasion/cracked insulation/new crimps/etc.
(I had voltage spikes before UPS was installed..and since had a loose HDMI connection/and behavior like that Just before a keyboard and a mouse die)
Run another file as an air cut...then the suspect file.
If still problems...do a UR...and aircuts again.
If Still problem...do a TS...and aircuts.
Sometimes on our late 2013 and early 2014 Desktops, code got scrambled by shutting machine down and immediately shutting the computer off.
Now in the habit of starting machine/Then computer....and shutting down SB3, then computer, Then machine.
Yep, 24/7 365 days Support when someone was always on call...was one of the reasons we went Shopbot.
scott
also check all power saving settings/updates/etc. are turned OFF.
Hope it works for you Bud...bearing blocks ain't cheap!
A good weekly oiling of the felt wipes(and cleaning the rails) is way cheaper.
Last edited by scottp55; 09-05-2021 at 05:54 AM.
scott P.
2013 Desktop/spindle/VCP 12.0*
Maine