This is what I was trying to caution against. In my situation, that I shared, the rings did not turn by hand check as you describe. Could be that my grip is not strong but I am rather fit. There was pressure but not sufficient. I know it was a freak situation but can happen.
On Jul 1, 2023, at 9:29 AM, Joe Calhoon via groups.io <joecalhoon@...> wrote:
?A very simple method to avoid a spun shaft is to get in the habit of griping the shaft by the spacers and or cutter before turning on the machine to make sure they don¡¯t turn. Now in the case of using bushings on adjustable groovers you have to be more careful as the spacers could be tight but you could have movement in one of the groovers. Using bushing with these should be avoided if possibly.
A spun shaft will make a particular noise when starting up. If you can recognize this and shut down right away you can usually avoid damage. Don¡¯t ask how I know this. Joe