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Removing spur center (Read 1,067 times)
 
Lucas Williams
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Removing spur center
Apr 25th, 2017 at 4:41pm
 
Just got a lathe, can't figure out how the spur center comes out. Sprayed penetrating oil everywhere. Locked the wheel in place and tried unscrewing it with pliers as well as popping it out with a metal rod. Any ideas would be appreciated.
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« Last Edit: Apr 25th, 2017 at 5:03pm by Lucas Williams »  
 
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Ed Weber
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Re: Removing spur center
Reply #1 - Apr 25th, 2017 at 5:34pm
 
If the spindle is hollow all the way through (which I doubt on this lathe) you usually put a rod through the back side and tap it out.
Otherwise, a slide hammer comes to mind.
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Michael Maye
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Re: Removing spur center
Reply #2 - Apr 25th, 2017 at 6:51pm
 
Looks very similar to my headstock. I've a nut on the threaded spindle which I unwind with a 26mm spanner which push's the drive centre out of the headstock. As previous poster said, if there's access from the back, try putting in a length of steel rod (6mm/1/4") and tap it gently, short sharp taps. I have to do this for removing my live centre from my tailstock end.
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Don Stephan
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Re: Removing spur center
Reply #3 - Apr 25th, 2017 at 7:22pm
 
Can you give the make and model of the lathe?
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brent ashcraft
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Re: Removing spur center
Reply #4 - Apr 27th, 2017 at 7:44am
 
I had one once with the same problem.  Turned out the previous owner had used steel wool to keep it from slipping in the taper.  It had transmorgified over time to make a fairly solid chunk.  Took lots of penetrating oil, love taps from a hammer, a pipe wrench, and usage of foul language to free it.

Brent Ashcraft
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Bert Delisle
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Re: Removing spur center
Reply #5 - Apr 28th, 2017 at 8:56am
 
If you can find an auto mechanic,  use a tie rod removal tool it may work to remove your drive center. The tool is like a tapered tuning fork and is designed to separate the tapered shaft of steering tie rods on cars. Good luck.
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Ed Weber
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Re: Removing spur center
Reply #6 - Apr 28th, 2017 at 10:38am
 
Bert Delisle wrote on Apr 28th, 2017 at 8:56am:
The tool is like a tapered tuning fork and is designed to separate the tapered shaft of steering tie rods on cars.


Those are usually refereed to as pickle forks and they will more than likely damage the spindle. (I have several of them)
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Arlin Eastman
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Re: Removing spur center
Reply #7 - Apr 28th, 2017 at 4:30pm
 
Lucas

First Welcome and glad to have you here.  I think the others have already made good suggestions so I will not add anymore to it.
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John Cepko
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Re: Removing spur center
Reply #8 - Apr 29th, 2017 at 7:09pm
 
I had to lock the spindle, and grab the drive spur with some vise grips and twist while a friend persuaded it with the knockout bar.
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Ed Weber
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Re: Removing spur center
Reply #9 - Apr 30th, 2017 at 8:43am
 
Now that it's out, you may want/need to get a morse taper reamer to clean up the spindle this before you try again.
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Bill Moschler
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Re: Removing spur center
Reply #10 - Apr 30th, 2017 at 6:13pm
 
I second the suggestion for the Morse taper reamer.  And toss the center and buy a new one.
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Ron Rutter
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Re: Removing spur center
Reply #11 - Apr 30th, 2017 at 11:12pm
 
Ed. I don't think Cepko was referring to Lucas' problem!
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Ed Weber
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Re: Removing spur center
Reply #12 - May 1st, 2017 at 8:15am
 
Ron Rutter wrote on Apr 30th, 2017 at 11:12pm:
Ed. I don't think Cepko was referring to Lucas' problem!


You're correct, I did confused the two.  Embarrassed I suppose it's a more common problem than I previously thought.
I still recommend a reamer to clean the taper.
There are really only a few methods of removing a press fit union like a morse tpaer.
penetrating lubricant, pressure, vibration and heat. How you approach these methods depends on many factors. Choices tend to be limited on older machine for fear of damaging parts that can no longer be easily found.
It will be nice to hear how Lucas finally resolves his problem.
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Scott Ticknor
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Re: Removing spur center
Reply #13 - May 1st, 2017 at 9:03am
 
Try heating the shaft with a torch I`m pretty sure your bearings will need replacing after all the "love and attention" anyway . Good luck and let us know how it ends up.
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David Moeller
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Re: Removing spur center
Reply #14 - May 1st, 2017 at 11:25am
 
A few yrs ago I was building bicycles. Degreasing bearings, etc. using cans of Brake Cleaner, rust busters,whatever Sad. (still do)  Please do not torch around any of those compounds. I am not a chemist or expert but narratives convinced me to not combine torches, poor ventilation, and unknown compounds.
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Tom Coghill
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Re: Removing spur center
Reply #15 - May 1st, 2017 at 11:45am
 
If you are applying heat, the heat should be applied to the outside (spindle) and the spur center should be cooled.  Not sure how that can be done effectively.

Another question is... when you get the spur center out, what are you going to do, mount a chuck? Roll Eyes

You bought this lathe??    Cheesy
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Lucas Williams
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Re: Removing spur center
Reply #16 - May 1st, 2017 at 10:48pm
 
Thanks for all the suggestions. Ill try some of them. And to answer Don Stephens question, it doesn't have a make and model since its custom built. Only the motor..
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Ron Sardo
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Re: Removing spur center
Reply #17 - May 2nd, 2017 at 6:51am
 
FWIW, applying heat to remove the center is a bad idea. It will cause more problems than it fixes.
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Ed Weber
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Re: Removing spur center
Reply #18 - May 2nd, 2017 at 8:39am
 
Ron is correct about over heating. It should really only be done as a last resort or if you have experience with this type of situation.

As to heating the shaft. Low heat, (well below changing the temper) can be applied to the spindle without issue. This can sometimes aide the migration of any perpetrating oil or loosen/soften whatever substance may be interfering with the taper.

Some parts may be damaged regardless of how you eventually have to remove the drive. It's up to you to decide which parts those are.
It should also be mentioned you can also remove the spindle with the drive center still inserted. Once removed it may be easier to assess the issue.
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Ed Weber
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Re: Removing spur center
Reply #19 - May 2nd, 2017 at 9:27am
 
I should add, when I say gently heat, I'm talking about using a heat gun not a torch.
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Jeff howell
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Re: Removing spur center
Reply #20 - May 27th, 2017 at 7:04pm
 
Looks just like my 1954 craftsman.  I just use a long screwdriver and a hammer to push it out from the other side of the headstock.
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