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Atlas milling machine with a stuck arbor

 

Check your tapers. After some use the tapers tend to rough up and stick or not hold. A #2 Morse taper finishing reamer gently applied will solve the problem!


On Fri, Jul 5, 2024 at 8:54?AM Jon M via <macgahan=[email protected]> wrote:

[Edited Message Follows]

Several times I have had a MT2 part (end mill holder, drill chuck, etc.) stuck? in the spindle of my Atlas mill.? Each time I was able to beat it out from the back with a 1/2" round rod and a hammer.? It was not pretty.? I worried about damaging the spindle bearings.

The problem was caused by me tightening the draw bar too much, not from leaving the part in the spindle.? You want the draw bar just snug - don't honk down on it.? I insert the MT2 taper, give it a moderate tap with a lead hammer, then tighten the draw bar just snug - not much more than hand tightening.? MT2 tapers have a propensity for getting stuck.

Revised to correct a mistake... spindle not arbor.

 



On Sun, Jul 7, 2024 at 7:59?AM Bill Williams via <BWMSBLDR1=[email protected]> wrote:
Check your tapers. After some use the tapers tend to rough up and stick or not hold. A #2 Morse taper finishing reamer gently applied will solve the problem!

On Fri, Jul 5, 2024 at 8:54?AM Jon M via <macgahan=[email protected]> wrote:

[Edited Message Follows]

Several times I have had a MT2 part (end mill holder, drill chuck, etc.) stuck? in the spindle of my Atlas mill.? Each time I was able to beat it out from the back with a 1/2" round rod and a hammer.? It was not pretty.? I worried about damaging the spindle bearings.

The problem was caused by me tightening the draw bar too much, not from leaving the part in the spindle.? You want the draw bar just snug - don't honk down on it.? I insert the MT2 taper, give it a moderate tap with a lead hammer, then tighten the draw bar just snug - not much more than hand tightening.? MT2 tapers have a propensity for getting stuck.

Revised to correct a mistake... spindle not arbor.

 

Time is your friend in this situation.
Use Kroil several times a week combined with hitting the end with a lead hammer every time you go by.
the shock will aid in penetration and one day it will fall out when you hit it.
Attempting “Brute Force” will end up with bruised knuckles and/or broken machinery.
Don’t ask how I know.

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