Countersink chattering???

[tkatc]

I have 2 countersink cages as most builders recommend at least 2. I have found that one of my cages has a tendency to leave "chatter" marks as opposed to a smooth cut. The other one is just fine. Any idea why this happens?

The "good" cage is a "pressed" design and you cannot access the bearings whereas the "bad" cage has a removable clip that I assume gives access to those bearings. Is there some sort of adjustment to be made? I hate chucking up different size countersinks and adjusting for depth each time. I'd rather set it and forget it...

[Sid Lambert]

Your pilot hole may be too big or the pilot is worn out. Try under drilling by a size or 2 on some scrap and see if it still chatters.

[jrs14855]

try a slower r/m on the drill.

[Ron B.]

Did you try lubricant?

[JanRV6UK]

if you swap over the cutters - does the same cage still chatter ? If so it sounds like the bearing or bush is worn out. I have several that I bought on ebay - Running at 2900rpm or faster .. Never a problem with chatter if the bearing is tight - Can you wobble the shaft side to side if you push on the cutter nose ?

[tkatc]

Yeah, even if I change bits it still chatters. Those same bits work fine in the other cage so I've narrowed down the problem to the cage. Worn bearings?

[JanRV6UK]

I would say so - Does it have a bearing or a bush ? The shaft itself could also be worn ... Take it apart and have a look - You may be able to get a new bearing for it or a new bush ..