Problem with 'swishing' noise on my Bridgeport

HI All:

I have another issue with my bridgeport (series 1 varispeed 2hp) . . . :scratchchin:

It makes a swishing noise when in low speed. IN high speed it's not so noticeable although it seems to still be there.

I found a video that seems to duplicate the noise but the fix is something I don't understand. That is, the fella that posted the video presumes a level of knowledge that is different than mine so I don't quite get what he's talking about when he explains why what he does works to fix the problem. :dunce:

I've put the 3 videos in this post.

These first two give an example of the kind of noise my machine is making:

#1

Bridgeport Milling Machine - Still Loud - YouTube

#2

Bridgeport Milling Machine - Noise Diagnosing - YouTube


This third video shows the fix:

#3

Bridgeport Milling Machine - (Noise) Problem SOLVED! - YouTube

The noise is pretty much identical to the noise my Bridgy makes. It's a swish swish swish at each revolution most noticeably at low speed; louder than the video it seems.

Can someone explain what he means in the fix video when he talks about why changing the diameter on the pins works? :bowdown:

Or is this not an example of a problem with a vari-speed due to the different pulley arrangement?


Thanks,

Psient