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Thread: Stuck chuck on Hercus 250G
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6th Aug 2018, 06:19 PM #1Member
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Stuck chuck on Hercus 250G
I have a stuck chuck on my Hercus 260g.
Does anyone have any idea how to remove it?
I tried using an air impact driver with a hex bar in the chuck but it did not loosen it (turning left).
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6th Aug 2018, 06:45 PM #2Most Valued Member
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Do you have the lathe in its lowest speed?
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6th Aug 2018, 06:52 PM #3Member
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6th Aug 2018, 07:16 PM #4Most Valued Member
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Do you have any idea how long the chuck has been on?
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6th Aug 2018, 07:41 PM #5Mechanical Butcher
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I don't want to scare anyone, but someone I know went to extremes to remove his Hercus chuck, and unfortunately destroyed the spindle in the process.
What he did was clamp the removed spindle in a big vice, which of course made a mess of the machined surfaces. It slipped anyway when he tried to unscrew the chuck.
To retrieve the chuck's backing plate, I welded some 8mm plate to the now useless spindle, to get a better purchase in it in a cast iron Dawn 6inch vice.
It took a humungous amount of levering torque before it came free.
So, as a last resort, rather than forcing until something breadks, it might be worth sacrificing your backing plate by turning it down to just clear the spindle threads, when it might then easily come off.
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6th Aug 2018, 08:26 PM #6Most Valued Member
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6th Aug 2018, 08:38 PM #7Member
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I have no clue how long the chuck has been on the machine.
Would it be an option to heat up the bore of the spindle slightly to expand/contract the metal and soften any grease/oil which could be acting like glue?
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6th Aug 2018, 08:59 PM #8Most Valued Member
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You could try heat if you want, don't really like the chances, you could try putting something between the open jaws and giving it a good hit,you could try and make something to positively lock the spindle and try your rattle gun again or the bar through the chuck jaws, you could try locking the spindle and hanging a heavy weight on a lever from the chuck jaws, any of these options may or may not work and may work quickly or slowly,if you have the time might as well try them all.
If you don't have the time or inclination do as suggested, if your able to remove the chuck from the backing plate remove it and machine the plate off,if you wanted you could after removing the chuck use spot heat on the backing plate with the spindle locked,don't heat the whole plate if you go down the heat road.
If you machine the backing plate off replacement's are readily available.
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6th Aug 2018, 09:12 PM #9Member
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6th Aug 2018, 09:17 PM #10Pink 10EE owner
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Get a bugger rattle gun
Or put a 1m length of timber in the jaws and get a good swing at the end with a decent hammer with the spindle in neutral.
IMO you need to give it a big shock . You do not want and gears engaged anywhere when you give it that shock, lest you damage them.Gold, the colour of choice for the discerning person.
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6th Aug 2018, 09:20 PM #11Most Valued Member
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1 3/4" x 8
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7th Aug 2018, 09:41 AM #12Mechanical Butcher
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The 260G is the geared head model, otherwise I'd cautiously consider this method:
On a belt drive Hercus 260, I've had success removing a stuck chuck by selecting the slowest direct speed (no back gears), and placing a plank of strong wood on the bedways under the chuck.
Get another block of wood with height made to the bottom of a chuck jaw in horizontal position, on the side of the chuck away from you.
Then rotate the chuck so the jaw is off the block a bit, and momentarily switch the lathe on in reverse.
Just to mention again, installing a chuck by spinning it on to the spindle until it slams against the register face is asking for trouble.
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7th Aug 2018, 09:45 AM #13Most Valued Member
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What is your preferred method of mounting?
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7th Aug 2018, 10:07 AM #14Mechanical Butcher
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I generally clean the spindle register and threads and chuck threads and lubricate with oil.
Then just screw the chuck on gently to the face, with maybe a slight extra bit of torque by hand once it's there.
In use the fit gets firmer. I've never had a problem with a loose chuck in use.
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13th Aug 2018, 10:34 PM #15Member
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I have machined off the plate.
Now I wait for the new one.
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