Siezed Draw Tube Advice

[generaldisarray]

So I learned something new. You can get your drawtube stuck inside your spindle. This is on a five year old NLX2500SY.   Have any of you ever dealt with this? On Monday I will have everything in place to attempt to Enerpac this thing out. I have tried dryice, which worked for a about a minute but then it re-siezed before I could get the drawtube removed. I have been fairly successful in keeping the "maintenance" men and their hammers away. What is worrying me here on Sunday is when I put 50 tons of force on that tube, is there a chance that it will cause the spindle to swell? I mean there is a interference fit now,  something has to move. Should I dryice it and press it? Should I stop and just machine it out now and not risk it? The old Mori dealer says no problem, just use "plenty of timbers". I dont know exactly what he means , but I am not directing any force through a bearing. Only between the spindle face and the drawtube.

[gcode]

How does one get a draw tube stuck in a spindle

Did it get bent.. or too much pressure on the actuator ??

I think I'd call a professional for this one. It sounds like it would be real easy to destroy a spindle and headstock with 50 tons of pressure

[mkd]

All i can think of is coolant causing some corrosion to get it stuck. I'd be taking a long look at the spindle drawings to make sure not to apply force to bearings.

Seems like a questionable design/materials for such a new machine.

[generaldisarray]

cast iron fines. From my reading cast aluminum will also do it.

[mkd]

1 hour ago, generaldisarray said:

cast iron fines. From my reading cast aluminum will also do it.

post a Pic of the tube when you get it out. Curious to see what's going on...

[R. Van Winkle]

8 hours ago, gcode said:

How does one get a draw tube stuck in a spindle

 

Ours rusted itself to the spindle. Was on a 12 year old HAAS. 

[Brian Pallas]

I've never heard of anything like this happening.

 

R. Van Winkle - Has the machine sat for a period of time after running cast iron?  We had some Haas lathes at one shop that ran a production cast iron job like 2-1/2 weeks out of a month, and we eventually got the point where we pulled the chuck and replaced the seals after each run because of contamination.  Just wondering if you got to a root cause on why it was rusted in?

[generaldisarray]

[generaldisarray]

[generaldisarray]

These machines run 24/5. and this machine has not run Cast Iron in over a month. Draw tube seized while the last remnant of a job was being removed before setup of the next part. The chuck stopped half-way open.

The winning recipe was dry ice and about 90% of the 55 ton ram. The ram bore against the chuck bolts, even at maximum load the spindle turned like normal. After the first 3 to 5 inches the force required went down considerably. 

[mkd]

"cast iron fines"

 

looks like you called it right.

 

yearly PM from now on, eh?

[generaldisarray]

after every cast iron run im thinking. about bi- annual

[#Rekd™]

For futures are you supposed to lubricate the draw tubes or clean them?

[R. Van Winkle]

We have not run any cast iron in these machines in the year I've been here. We do run a lot of Molybdenum, which has it's own set of issues but I don't think rust is one of them.