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This is getting infectious - stuck chuck

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PekkaNF:
Every now and then I see someone asking advice on stuck chuck. Being avid MT user I though I'm already old hand and stuff does not stop me right on track anymore.....you saw it coming.

I have 3-16 mm drill chuck in B16/MT3 arbor that has M12 thread.

Usually I use a slide hammer on M12 thread and a bar chucked into the chuck. Few blows and no drama. I had lend slide hammer to my brother and right now he is away. I tried to use 200mm long  bolt, but it just did not have enough impact.

How about freezing and heating? Chuck it into freezer for half a day and then applied hot air gun into chuck + makeshift impact hammer. No progress.

I had to make wedges. Two hours in total, I had to cleanup etc. After fitting wedges , short application of freeze spray into arbor and two exploratory thumps with a mallet separated them.

Phew.

Pekka

awemawson:
.... now if it had been an R8 self releasing taper . . . .   :lol:

PekkaNF:

--- Quote from: awemawson on June 28, 2014, 04:08:19 PM ---.... now if it had been an R8 self releasing taper . . . .   :lol:

--- End quote ---

Wow. Never heard of R8 used between drill chuck and MT3 arbour :lol:

Still happy of B18 taper now it has proved to be reliable for drilling. Just to clarify - the lot came off easy from the lathe, but I was trying to remove drill chuck from the MT3 arbour.

Pekka

awemawson:
Should have said so then  :ddb:

vtsteam:
My homemade mating slotted wedges are in their own special little drawer just above the lathe -- so I won't misplace them as I do so many other things that aren't often used. This forum was my introduction to using wedges for stuck taper separation.

Their specialty is the Jacobs taper......


And ironically enough -- I can't keep the Jacobs chuck ON my drill press spindle for more than a 2 month period, much as I wish it to stay there. It usually falls off at some inopportune moment drilling a fine hole in some important machined part, snapping the drill bit in the hole.

I've cleaned the tapers with acetone before installing, everything perfectly clean, and tapped it in place with a brass hammer. But sooner or later, out it comes. Unlike the 3 donated ball bearing Jacobs Super chucks I received which required beating on the wedges with a sledge over concrete before coming free.  :doh:

Must be a case of Jacobs Law.

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