Hi,
I am having a difficult time removing a back plate from a lathe chuck.
(NOT stuck on the lathe)
It has never been removed before, and is new, likely with all the "gunk" it was shipped with.
The back plate is cheap chinesium cast iron and the chuck a small cheap-o 5" three jaw.
I don't see any other bolts/screws...
I removed the three screws on back which typically hold the back plate to chuck, as is with my other chucks/plates.
I have tried 50/50 acetone+ATF soak overnight, some tapping with dead blow, twisting/rotating won't budge.
Also I tried holding it with the back plate up and the chuck down and rapping the sides also - hoping gravity might help during the sharp blows ( as opposed to hitting face or back with I thought might act like a hammer or axe head and handle and actually drive it inward instead)
I "gently" tried tapping the bolts while they were threaded most of the way into the chuck from behind - no go, but maybe I didn't whack them hard enough in fear of trashing threads.
My assumption is it is just stuck in their with gunk or rust where the "step" is that the back plate fits into the insert on back of the chuck (at least that is how my other chucks seem to be made and attached to their back plates)
I haven't yet figured out a good way to grip and hold the back plate with enough pressure to twist it - at least not without tearing it up being cast iron....
I also couldn't yet figure out how I might use heat on the chuck that a) wouldn't also heat the back plate at the same time, and b) burn all the grease/oil into a mess that would make everything worse)
I did try some all-around, gentle heating with a blow torch in case that would loosen or help release whatever gunk, rust, etc. in there.
The back plate is threaded for a spindle (on a BS-0 dividing head)
Any ideas ?
I am stuck, literally.
I am having a difficult time removing a back plate from a lathe chuck.
(NOT stuck on the lathe)
It has never been removed before, and is new, likely with all the "gunk" it was shipped with.
The back plate is cheap chinesium cast iron and the chuck a small cheap-o 5" three jaw.
I don't see any other bolts/screws...
I removed the three screws on back which typically hold the back plate to chuck, as is with my other chucks/plates.
I have tried 50/50 acetone+ATF soak overnight, some tapping with dead blow, twisting/rotating won't budge.
Also I tried holding it with the back plate up and the chuck down and rapping the sides also - hoping gravity might help during the sharp blows ( as opposed to hitting face or back with I thought might act like a hammer or axe head and handle and actually drive it inward instead)
I "gently" tried tapping the bolts while they were threaded most of the way into the chuck from behind - no go, but maybe I didn't whack them hard enough in fear of trashing threads.
My assumption is it is just stuck in their with gunk or rust where the "step" is that the back plate fits into the insert on back of the chuck (at least that is how my other chucks seem to be made and attached to their back plates)
I haven't yet figured out a good way to grip and hold the back plate with enough pressure to twist it - at least not without tearing it up being cast iron....
I also couldn't yet figure out how I might use heat on the chuck that a) wouldn't also heat the back plate at the same time, and b) burn all the grease/oil into a mess that would make everything worse)
I did try some all-around, gentle heating with a blow torch in case that would loosen or help release whatever gunk, rust, etc. in there.
The back plate is threaded for a spindle (on a BS-0 dividing head)
Any ideas ?
I am stuck, literally.