Remove Seized on chuck ??

Gallery, Projects and General > How do I??

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micktoon:
Hi lads thanks for the in put so far .
Stig, I have tried the windy impact gun on the about 30mm hex bar no luck, it is good windy gun and will shift most stuuborn bolts on Landrover etc.

Mike , I have ran out of oxygen , I dont want to damage the backplate by tig ing if I can but will if I have to.

Andrew, both lathe and chuck have been in the same place forever so will have been same temp, the inverted tool is good idea and I can probably try but to be honest
I have had real force applied to the backplate , I would say lots more than a cutting tool would produce ?

Norman, when I say I have give it some welly I mean really I have large copper hammer full belt onto inch bar wedged through M12 bolts through backplate with spindle locked via gears and the 3 feet long bar also jerked down with full weight until its flexing and it was a hardened steel bar. if the lathe was not frightened it must be hard as nails lol

Stuart, the wood clamp idea had crossed my mind its on the possible list but hoping not to have to make something complicated.

Pete, I think your idea gets the vote so far , mainly in part , what happens when this happens again, also as you say cutting all gears etc out the chain..........the last thing I wanted was another bloody project to make something to do a job......... but I should have known lol

Thanks again for the ideas so far................. so does anyone think they know exactly how it has become so stuck from putting on by hand, what is stuck to what ??

Cheers Mick

BaronJ:

--- Quote from: tekfab on June 04, 2014, 02:12:03 PM ---Strip it back to the backplate as in your third picture and use heat, don't piss about with a blowlamp either use oxy/acet or a tig set up will keep the heat more concentrated and it should spin off no problem.

Mike

--- End quote ---

I agree this is the way I would go. Lock the gears and use a wooden wedge as well ! Use a long bar as a lever and apply some rapid intense heat around the backplate but keep away from the spindle bore. You want to expand the backplate not the spindle. Apply a high pressure to the bar whilst you heat it up.

I would suspect that the backplate was probably hot when it was screwed on.

HTH.

PekkaNF:
Bummer....Can't really use too much impact because fear of brineling the bearings or breaking gears. Propably impact wrench with limited pressure would be least detrimental. Can't use too heat, because of the seals, bearings, hardened parts etc.

To me intermitent cut + some sort of bar inside the chuck to prevent the chuck (or back blate) bouncing around sounds worth trying, maybe a little heat from hot air gun outside the back plate and then cold spray inside the spindle .... it's not much, but combined effect might be enough. Here we probably want maximum diameter and plenty of extension from the chuck to make it walk out of the lock. You have penetrating oil, you need a little movement there.

I have had some joints I was pretty sure will not come out without a angle grinder but few days of penetrating oil and heat/cold cycle got them eventually undone. I know this is not rust, but situation is pretty much the same.

I'm really really reluctant to hit anything on lathe spindle if it has AC-bearings or such.

Pekka

Bigbadbugga:
Id say awemason might have touched on the answer, if the chuck and register were hot and cold compared to one another then a snug fit could easily have become an interference fit once they equalise.

BillTodd:
Do not engage the gears - hold the spindle in neutral with a split bar gripper thing inserted into the rearof the spindle.

protect the bed with wood so nothing can hit it.

bolt a short bar to the back plate (get every thin a stiff as possible) and hit it hard n fast with a good size hammer .

Or

just machine it off - it would be a real shame to damage that beautiful restoration.

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