WakelessFoil
Aluminum
- Joined
- Aug 18, 2020
We test fired our Cincinnati No. 2 horizontal mill today. We had a large 8 inch, 32 tooth (HSS?) cutter that we were gonna use to cut a simple 1/2” deep slot in a piece of steel. We chose a very conservative chip load with low spindle RPM and even lower feed rate; well under book recommendations.
When we went to make a cut, it sounded as if the cutter was not concentric with the spindle. We listened to the sound of what appeared to be an interrupted cut.
Brrrp… Brrrp… Brrrp…
This led us to take a runout on the spindle in a couple of places. Right in front of the cutter we got 0.005” total RO. Not good but it got even worse when we moved out dial to the end part of the spindle that sticks out past the head; .015” TRO!
Could this be a bent arbor? Or maybe worn out spindle bearings? What does it sound like to you? This is a 70+ year old machine.
When we went to make a cut, it sounded as if the cutter was not concentric with the spindle. We listened to the sound of what appeared to be an interrupted cut.
Brrrp… Brrrp… Brrrp…
This led us to take a runout on the spindle in a couple of places. Right in front of the cutter we got 0.005” total RO. Not good but it got even worse when we moved out dial to the end part of the spindle that sticks out past the head; .015” TRO!
Could this be a bent arbor? Or maybe worn out spindle bearings? What does it sound like to you? This is a 70+ year old machine.