So yesterday I finally fired up my new Jet 1221. With nothing mounted but the faceplate, I expected to hear a cool whirl and humming sound. Unfortunately that wasn't the case. There was a noticeable grinding noise accompanied by an intermittent clicking or knocking. The machine on slow speed ran silently until the speed was increased.
So with some tools in hand I went about trouble shooting it myself. Removed the faceplate and live center, thinking maybe one of them were not seated right. Then I pulled the handled. Still the same noises. I then moved the belt to another speed setting and still the same. To my ear, it sounds like bad bearings.
Next step was a call to Jet. The tech, after hearing the noise thru the phone, had me go thru the same paces I had already done as the noise wasn't usual. He then had me pull the belt and run just the motor. No noise was heard. He also had me loosen and tighten the set screws on the pulley in specific order- keyway first followed by the opposite side. Still the noise persisted. He informed me that since I purchased the lathe thru Amazon I would have to deal with them if this was in the first 30 days. However he did tell me that once a second call was placed, they would deal with it. That made me feel a bit more confident Jet wouldn't just make the claim that since it's spinning true and working, the noise is incidental.
I'm pretty confident a bearing or even both bearings are the culprit. I pulled the shaft and even though they don't make the grinding noise when spun by hand, the belt tension could surely influence this situation if the bearings were faulty.
This is a pretty basic design. Nothing complicated about it. What I'd like to do is replace the bearings with higher quality bearings rather than wait the 30 days and then make the second call to Jet. I know it's additional expense, but it's also my time and heck, if the bearings they're using aren't all that great - I believe they're NSK - sizes are 20Ă—42x12 -NSK #6004vv and 25Ă—47x12 - NSK #6005vv. Not being familiar with bearings, is there a better type of sealed bearing for this? Cylindrical bearings vs the ballbearings used? I suspect Jet went middle of the road and would actually prefer better if available.
So with some tools in hand I went about trouble shooting it myself. Removed the faceplate and live center, thinking maybe one of them were not seated right. Then I pulled the handled. Still the same noises. I then moved the belt to another speed setting and still the same. To my ear, it sounds like bad bearings.
Next step was a call to Jet. The tech, after hearing the noise thru the phone, had me go thru the same paces I had already done as the noise wasn't usual. He then had me pull the belt and run just the motor. No noise was heard. He also had me loosen and tighten the set screws on the pulley in specific order- keyway first followed by the opposite side. Still the noise persisted. He informed me that since I purchased the lathe thru Amazon I would have to deal with them if this was in the first 30 days. However he did tell me that once a second call was placed, they would deal with it. That made me feel a bit more confident Jet wouldn't just make the claim that since it's spinning true and working, the noise is incidental.
I'm pretty confident a bearing or even both bearings are the culprit. I pulled the shaft and even though they don't make the grinding noise when spun by hand, the belt tension could surely influence this situation if the bearings were faulty.
This is a pretty basic design. Nothing complicated about it. What I'd like to do is replace the bearings with higher quality bearings rather than wait the 30 days and then make the second call to Jet. I know it's additional expense, but it's also my time and heck, if the bearings they're using aren't all that great - I believe they're NSK - sizes are 20Ă—42x12 -NSK #6004vv and 25Ă—47x12 - NSK #6005vv. Not being familiar with bearings, is there a better type of sealed bearing for this? Cylindrical bearings vs the ballbearings used? I suspect Jet went middle of the road and would actually prefer better if available.