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8" Grinder having problems
Hello guys
I have a 8-in chi-won grinder that I have been using for sharpening my tool bits. As of recently , I have noticed that the wheels have quite a bit of run out. This grinder is not new, Ive had this thing for about 25 yrs now. Just recently I replaced both wheels, and noticed that the new wheels woobled left to right, and hoped up and down. Thought hmm, I must have gotten what I paid for down at the local Princess Auto.
I figured I should just replace the wheels, could get lucky and get a truer running set. I pulled the wheels, and put on a set that I had run on this grinder before. I fired it up, and got the same results. I thought OK maybe somthing else is going on here, so I figured I,d best have a look.
First thing was look at the plastic bushings thats in the centre of the wheels.
These where pretty loose fit to the shaft, about .015 bigger than the shaft.
I thought that may be the cause of the wheel hopping, but shoun,t have anything to do with the side to side wooble. I started looking for other things that had a loose fit, and found the washers , probly not the correct name, had a loose fit on the shafts as well. The shaft also shows a slight groove a few thou deep on the inboard side, this is where the washer sits against the shoulder. The out board sides show no marks or wear. Kinda strange, but none the less , they are there.
First thing I thought was to machine bushings to fit the bore of the wheels, and get rid of most of the .015 play that exists now with the plastic bushings.
I wonder if its safe to do this, or is the plastic bushing in there for a purpose that I,m not aware of?
The next thing I was thinking, was to make up a new set of washers. I don,t know if they can be damaged from possibly over tightning, or not. I see that there is signs of wear on the washer, where it butts up against the shoulder on the shaft. Could this be the source of the wobble? These washers look to me as they are just stamped out , and not a machined peice.
This leads to the next question. Again, is it safe to machine my own, or are the stamped out stockers done this way for other reasons? One last thought was to machine up new inboard washers, with the bushing as one part.
I would think in doing it this way , the inboard side washer / bushing as a assembly would have to run much truer than being seperate items.
I could be way off base here guys, and would really like to hear your thoughts on this. And yes the bearings on the grinder seem ok, and the shaft has no play that I can feel.
Cheers Paul
I have a 8-in chi-won grinder that I have been using for sharpening my tool bits. As of recently , I have noticed that the wheels have quite a bit of run out. This grinder is not new, Ive had this thing for about 25 yrs now. Just recently I replaced both wheels, and noticed that the new wheels woobled left to right, and hoped up and down. Thought hmm, I must have gotten what I paid for down at the local Princess Auto.
I figured I should just replace the wheels, could get lucky and get a truer running set. I pulled the wheels, and put on a set that I had run on this grinder before. I fired it up, and got the same results. I thought OK maybe somthing else is going on here, so I figured I,d best have a look.
First thing was look at the plastic bushings thats in the centre of the wheels.
These where pretty loose fit to the shaft, about .015 bigger than the shaft.
I thought that may be the cause of the wheel hopping, but shoun,t have anything to do with the side to side wooble. I started looking for other things that had a loose fit, and found the washers , probly not the correct name, had a loose fit on the shafts as well. The shaft also shows a slight groove a few thou deep on the inboard side, this is where the washer sits against the shoulder. The out board sides show no marks or wear. Kinda strange, but none the less , they are there.
First thing I thought was to machine bushings to fit the bore of the wheels, and get rid of most of the .015 play that exists now with the plastic bushings.
I wonder if its safe to do this, or is the plastic bushing in there for a purpose that I,m not aware of?
The next thing I was thinking, was to make up a new set of washers. I don,t know if they can be damaged from possibly over tightning, or not. I see that there is signs of wear on the washer, where it butts up against the shoulder on the shaft. Could this be the source of the wobble? These washers look to me as they are just stamped out , and not a machined peice.
This leads to the next question. Again, is it safe to machine my own, or are the stamped out stockers done this way for other reasons? One last thought was to machine up new inboard washers, with the bushing as one part.
I would think in doing it this way , the inboard side washer / bushing as a assembly would have to run much truer than being seperate items.
I could be way off base here guys, and would really like to hear your thoughts on this. And yes the bearings on the grinder seem ok, and the shaft has no play that I can feel.
Cheers Paul
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