Gallery, Projects and General > Oooops!
Stuck Collet Chuck Arbor
philf:
Jonny,
See the attached drawing which perhaps explains my proposed method better than words.
Cheers.
Phil.
PekkaNF:
How about putting it into tension like above illustration shows and spraying inside of the collet chuck with cold spray. On that sort of situation combination of static pull and thermo shock has opened up stuff. Another thing that has helped me a lot is to open drawbar just a little before giving it whack to it. I think that there must be pretty many thread to transmit the blow. Same thing on steering joint tappers on auto.
Once I was despairing with my fly rod, it simply refused to open and four piece rod is not very handy to transport when one ferrule in middle won't open. Not ideal situation in Oaxaca when had to go home next day. Tried everything and finally hosed it down with a cold water. It came unstuck - practically with no force.
PekkaNF
ukazak:
I tried today,
Turned a close fitting sleeve and washer. it turned a few lines of thread, than came to a point that looked like trying to unscrewing a welded bolt.. wouldnt turn more. maybe I have to try to apply more power to it with a friends help.
one thing is for sure, one can easily depend his life on it. I did not put the chuck in there, it came on with the machine. it may have set a couple of years before it was sold to me, and I used couple of years and not removed once. So, it may be frozen until the death apart. There are no bending or twisting evidence on it, for it is spinning really like you wouldnt know it was spinning, if if you didnt hear the machine running. if there was a twist it would wobble a bit..
may be they had placed the chuck right after test run (while machine and spşndle hot) snd there was a piece or two dust in it.. than sit there for couple of years and get rusted..
Tomorrow I will try again with doubled force to give turn or two more... if not, I may be to take down the head and get the spindle out to take it to a press shop.. hpefully, we get it out without bending the spindle or demage it someway..
ukazak:
who ever discovered this "Morse Cone" thing, did realy a good job, I must say. Could never thought theoraticaly is possible that thing works..! no bolting, no screws, no glue, no welding.. but, it holds. It is amazing..!
philf:
Ukazak,
I forgot to mention to grease the threads, washer and sleeve to convert more of your turning effort into trying to extract the taper.
I think someone has mentioned trying to rapidly cool the internal taper. I have some freezing spray for fault finding in electronics but you can also get freezing sprays for plumbing. I think you'd have to put as much tension as possible with the nut and then quickly cool the chuck.
I've found the opposite works on a stuck crank on a bike - tighten up the extractor as much as you dare (the threads are quite fine and only into aluminium) and then pour a kettle of boiling water over the crank. It may be difficult to get enough heat into the spindle quickly enough without damaging anything and cooling the chuck may possibly work better.
Good Luck.
Phil.
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