Harrison l5 lathe manual chuck12/31/2022 ![]() This is the same design backplate that is stuck on my spindle, showing the register and rear face that is butted tight to the shoulder on the spindle. The actual one on the lathe is clean and spottless and oiled. This is a samller bore Harrison spindle of the exact same design showing the thread, register and shoulder, then the chrome cover, note the shoulder sticks out the chrome cover a small amount. ![]() Here are some photos of what I am dealing with. I am assuming the rear face is seated against the spindle shoulder and the 'lock' is between this and the threads, will this be the case ? I think it must be as this chuck has been on and off many times before and I know the register is clean and oiled as are the threads. I know 100% the threads are clean, there is film of light oil and the chuck has not been tightened other than by light hand pressure. It would seem totally impossible that it has become stuck this tight. ![]() The force used so far and the hits have gradually reached the point where something is likely to break if any more force used so looking for ideas. ( only thought of this after the other attempts ) Replacing chuck and chucking large hex bar then trying to loosen with large socket and windy gun. ![]() Heating the backplate up with propane torch and trying to shift while hot, then when cooled again, tapping all around trying to break seal Removing the chuck from the backplate, incerting 3 bolts through backplate holes and levering with 3 feet long 1 inch bar, hitting said bar to shock The usual realeasing oils etc, left over night and also repeated after heat applied Large hex bar in the chuck and big spanner on it, tapping the spanner to shock it and jerking spanner with the gear train locked so the spindle can not rotate. ![]() I have not even turned anything in the lathe but when I have come to remove the chuck its stuck fast. I am on the finishing jobs of my rebuilt Harrison L5 and had screwed the chuck on with very light hand pressure only after cleaning both spindle and chuck then applying light oil. Hi all, I am hoping that someone can help with a problem of a chuck that is stuck on my lathe spindle. ![]()
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