rim sprocket wobble and uneven bar wear ... I put a new rim sprocket on which is the right size, but the it seems to wobble on the splines of the clutch drum. The inside of the clutch drum has normal polish, but no groove IMHO. The reason I ask, is that the groove in the prior bar was worn unevenly - apparently the bar was never turned and the somehow the wear inside the groove favored one side over the other, leaving one rail almost twice as wide as the other.
I was wondering whether the rim sprocket might be turning sideways during rotation of the clutch drum (as the chain tightens during a pull, the rim sprocket "sets" to one side or the other), and this "set" of the rotating sprocket disk then adds a twist to the drivers of the moving chain, which then put a kind of sidewise "standing wave" within the chain, which then wears against one side of the groove ... (it's a used eBay saw, so I can't tell if it was the inside or outside rail which too the most wear.)
does that sound like what might have been happening?
is there a general rule about replacing clutch drums like there is for replacing sprockets with chains -- e.g. 2 chains per sprocket., then 2 sprockets per bar, then a new clutch drum for each new bar ?? Loosely speaking, for a prorperly maintained saw, does a clutch drum generally last as long as a bar?
I was wondering whether the rim sprocket might be turning sideways during rotation of the clutch drum (as the chain tightens during a pull, the rim sprocket "sets" to one side or the other), and this "set" of the rotating sprocket disk then adds a twist to the drivers of the moving chain, which then put a kind of sidewise "standing wave" within the chain, which then wears against one side of the groove ... (it's a used eBay saw, so I can't tell if it was the inside or outside rail which too the most wear.)
does that sound like what might have been happening?
is there a general rule about replacing clutch drums like there is for replacing sprockets with chains -- e.g. 2 chains per sprocket., then 2 sprockets per bar, then a new clutch drum for each new bar ?? Loosely speaking, for a prorperly maintained saw, does a clutch drum generally last as long as a bar?