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Clicking in Nova 1624-44

T

Tim Passmore

Joined
Apr 14, 2014
Messages
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Location
Winchester, IN
I purchased a Nova 1624-44 a couple of months ago and have been very pleased, however recently I've noticed a clicking sound in the motor. It is not as evident when the belt tension is released. Any ideas would be appreciated.
 
More details would be helpful. You probably have checked some or all of the following, but knowing how any of these affect the noise would be useful in troubleshooting:


  • Do you hear it with the belt removed completely from the motor pulley?
  • Does the ticking change with belt tension? If so, how (rate loudness, etc)?
  • How about different pulley ranges -- do they change the rate or loudness of the noise?
  • Have you checked the pulley to see it it is solidly locked down on the motor shaft?
  • If there is a setscrew, verify that it is tight -- before you do that, check the exploded parts diagram to determine if it has a jam setscrew sitting on top of another.
  • If there is a Woodruff key, check to verify that it is wedged in solidly.
  • With the power off and the belt removed, rotate the motor shaft by hand slowly to see if the noise is still there. Do the same thing for the lathe spindle.

If the ticking were related to the motor, then the ticking would be more like a low frequency buzz since the motor rotates at about 30 revolutions per second. If the ticking is such that there are several ticks per second, but you are able to distinguish individual ticks. then there might be a defect in the belt. If you suspect the belt, remove it, turn it inside out and examine for breaks and cracks in the ribs.

The problem is more likely to be in the spindle than the motor, but the source of sounds can be difficult to diagnose unless the troubleshooting procedure breaks things down into isolated components.
 
Thanks guys------ further inspection seems to indicate that the two sets of pulleys don't quite line up. I loosened the grub screw but was un able to slide the pulleys---- it does have a key. More input needed--- I don't want to mess up a new lathe. Which pulley would you suggest moving? Tips to properly do this. Sorry for my ignorance.
 
my .02 worth

I had something similar and I retightened both pulleys. In September last year I upgraded to the variable speed up grade and now I no need to make pulley changes. If you bought your lathe on sale the upgrade plus the sale price of the lathe will be approximately a DVR on sale on sale price. I did mine in these two stages because I could not afford the total price all at once. The upgrade will also give you more hp.
 
Tim Passmore said:
Thanks guys------ further inspection seems to indicate that the two sets of pulleys don't quite line up. I loosened the grub screw but was un able to slide the pulleys---- it does have a key. More input needed--- I don't want to mess up a new lathe. Which pulley would you suggest moving? Tips to properly do this. Sorry for my ignorance.
Click to expand...

I think they have double set screws. Take the screw all the way out and see if there is a second one under it.
 
Tim Passmore said:
Thanks guys------ further inspection seems to indicate that the two sets of pulleys don't quite line up. I loosened the grub screw but was un able to slide the pulleys---- it does have a key. More input needed--- I don't want to mess up a new lathe. Which pulley would you suggest moving? Tips to properly do this. Sorry for my ignorance.
Click to expand...

Did you remove the setscrew so that you were able to verify that there was not another one beneath it? Is the keystock straight or tapered? If it is eithered a tapered or a round Woodruff key, it may need to be removed before you can remove the pulley. In some cases that may mean moving the pulley towards the motor face to expose more of the key. One thing that you absolutely should NOT do is try tapping on the pulley or motor shaft to remove it. Doing so is an absolutely guaranteed way to trash the motor bearings. If you do not have the proper type of puller for removing the pulley or if all this unfamiliar, give strong consideration to letting a machine shop do the job. Learning by trial and error on expensive machinery can turn into an expensive education.

Before proceding, how great is the misalignment? Was it measured with a straightedge across the end of one of the sheaves? While the ideal condition is perfect alignment to minimize belt wear, very small angular or lateral misalignment are acceptable and perfect alignment is, in reality, never quite perfect.
 
I do have a 1624-44 and I've had the same issue in the past. Have to say you got good responses.
I did contact customer support and checked alignments, etc.
Ended up just replacing the drive belt and noise was gone--jus' lucky I guess.
 
Last edited:
I had a similar sound from my DVR XP but since it uses no belts it couldn't be that. I found the source was the index pin lightly touching it's indexing wheel. Lifting the pin eliminated that very faint clicking. Adjusting it's depth screw took care of that problem.

Maybe if all else fails with the belt and pulley proceedure?...?

Jim
 
Thanks everyone for your helpful hints. There is only one set screw and the pulleys won't move when it is loosened. The indexing pin is not hitting. I'm convinced the pulleys being slightly out alignment is the issue and it seems to increase when tension is increased. All that being said, I'm confident that it isn't something that's going to be "fatal" for the lathe. I don't think it's worth having the pulleys removed and realigned.
 
Tim Passmore said:
Thanks guys------ further inspection seems to indicate that the two sets of pulleys don't quite line up. I loosened the grub screw but was un able to slide the pulleys---- it does have a key. More input needed--- I don't want to mess up a new lathe. Which pulley would you suggest moving? Tips to properly do this. Sorry for my ignorance.
Click to expand...
Make sure your motor mount nuts and studs didn't come loose before you start messing around with the pulleys.
 
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