- Joined
- Apr 8, 2013
- Messages
- 1,986
The boring bar pictured below sings like a canary and I can't seem to stop it. It bores "OK" but although I can't feel the chatter with my fingernail in the bored surface I can see the herringbone. I've got a project coming up that requires boring to a square shoulder that has to seal against 40,000 psi and I know if that bar is singing now when it gets to that shoulder it's gonna dance. I've tried lots of feed/speed and tool height combinations with no luck. The machine is a Grizzly G4003G and it parts like a champ so I know it's rigid. My other bars cut great but won't fit in a .458 hole. It sings with the amount of projection shown in the photos and that is approximately the depth I'll need for the project. The bar looks to have 15 degree negative rake built into it via flats on the top & bottom. If the rake angle is the problem I can make a holder that will allow changing the angle. Any thoughts?