First cut from my 8520...what is this god awful noise coming from...

Also, you have that end mill hanging way to far out of the collet; it may be better to use end mill holders that fit directly in the spindle.
 
Agree with John, whatever else may be wrong, that endmill/toolholding arrangement is hanging too far out
 
You're missing a retaining clip. Do you have the exploded diagram of the head assembly? Go to vintagemachinery and download the manual.

I thought of something else. Have you adjusted the play in the quill? I still think it's the brake ring rattling against the inside of the pulley, but if things are loosey-goosey in the top of the head that will amplify the problem. Make sure that the pulley sleeve is tightened down to the top of the head, the bearing retaining clips are properly installed, and that the spline follower plate is tight on the top of the pulley. There are also a couple of spring-loaded "plugs" (557-007) in the plate (556-020) that grip the splined spindle shaft, keep it from rattling, and also keep the quill where you put it when they're properly adjusted. Check for play in all of the bearings, too. I was fortunate and the quill bearings in mine were still good, but I replaced all of the other bearings anyway. They're cheap, and I figured that since I already had it apart I might as well install new ones.
 
Post 7 the end mill looks crooked when zoomed in, is the collet snapped into the nut before installing onto the chuck ,
Just looks funny.
Edit are you sure it’s turning cw looks ccw when stoping. Sounds like a train whistle,May be a optical thing
 
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Agree with John, whatever else may be wrong, that endmill/toolholding arrangement is hanging too far out

Thanks for the tip. My work piece (which is not shown in the video) requires a depth of cut of 1.500" which is why my end mill sticks out so far. There's an additional .500 of clearance required for a jig so the end mill length needs to total 2.000". Not making excuses, it's just I need the length.
 
Post 7 the end mill looks crooked when zoomed in, is the collet snapped into the nut before installing onto the chuck ,
Just looks funny.
Edit are you sure it’s turning cw looks ccw when stoping. Sounds like a train whistle,May be a optical thing

Yes, it's snapped in and yes, I'm 100% positive that it's turning cw.
 
You see the brake handle shaking in sync with the noise? The brake ring is bouncing against the inside of the pulley. It's probably broken, like mine was. I silver brazed the ductile iron ring back together, shimmed it to fit closely around the head, bored and sleeved the worn pulley back into close tolerance, and mine only occasionally rubs now. Not the best design, though. If the ring breaks again (and it probably will) I figure I'll make a new one that fits better.

I'm pretty sure it's not the brake. I held it firmly with my left hand and manipulated the X with my right hand and the noise was still there.
 
I reduced my speed from 1900 to 600 and the noise has SIGNIFICANTLY reduced....almost non-existent. At this point, I'm guessing it's the pulley rattling at higher speeds since it's not secured correctly?
 
I thought of something else. Have you adjusted the play in the quill? I still think it's the brake ring rattling against the inside of the pulley, but if things are loosey-goosey in the top of the head that will amplify the problem. Make sure that the pulley sleeve is tightened down to the top of the head, the bearing retaining clips are properly installed, and that the spline follower plate is tight on the top of the pulley. There are also a couple of spring-loaded "plugs" (557-007) in the plate (556-020) that grip the splined spindle shaft, keep it from rattling, and also keep the quill where you put it when they're properly adjusted. Check for play in all of the bearings, too. I was fortunate and the quill bearings in mine were still good, but I replaced all of the other bearings anyway. They're cheap, and I figured that since I already had it apart I might as well install new ones.

I'll take this thing apart when I have some free time. This is the worst part of the year for me with kids being home, vacations, work, etc. but I'll get to it. Thanks for the reply. These retaining clips are standard I take it...
 
I'll take this thing apart when I have some free time. This is the worst part of the year for me with kids being home, vacations, work, etc. but I'll get to it. Thanks for the reply. These retaining clips are standard I take it...

My kids are long gone and I still don't seem to have enough time :).

Like I said, download the manual from Vintage Machinery and check out the head assembly diagram. There might not be any screws in the 990-061 Pulley Sleeve Assembly, in which case you will need three #10-24 x 1/2 socket head cap screws. If they are (heaven forbid!) broken, your life just got a lot more interesting all of a sudden. If the pulley sleeve is loose it would explain the racket. Since there is a little radial slop in the assembly I shimmed the gap around the spline shaft to make sure it was centered before tightening the screws (and used Loc-Tite).
 
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