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Absolute GUARANTEED trick for separating tapered shaft.


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  #1  
Old 12-19-2014, 06:28:07 AM
Thaumaturge Thaumaturge is offline
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Default Absolute GUARANTEED trick for separating tapered shaft.

I've tried all the tricks to separate a beligerant stuck tapered shaft connection between generator rotor and crankshaft. I've separated so many I have a series of bolts that tap into the end of the rotor and the other end screws into my slide hammer. That works FAIRLY well to separate most of them.

But the one trick that has NEVER FAILED TO WORK.... Is to fill hole with water. Screw in a bolt to keep it there and then LET IT FREEZE. Put it in a deep freeze if you've got one big enough. Otherwise just leave it outside and wait for a really cold night. The expanding ice will pop the taper every time.
Doc
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Old 12-19-2014, 08:17:15 AM
Roland Hayes Roland Hayes is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

A great idea so I thought I'd try it this morning on a stubborn Briggs 5 hp gen I'm working on, as per the theory I filled the hole with water then screwed a bung in the end to contain the ice, then took the whole thing into the house to put it in the freezer, when my wife saw me about to put that greasy thing in her freezer the look she gave me was cold enough to freeze that thing instantly and it just popped right off in my hands, perfect!
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Old 12-19-2014, 09:08:33 AM
RobW RobW is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

The icy stare . . .
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Old 12-19-2014, 12:00:15 PM
RSCurtis RSCurtis is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

No need to wait for Mother Nature. Instead of water, cut a steel rod about a 1/2" shorter than the depth of the armature, and then thread the end of the rotor and use that and a bolt as a puller. Works every time.
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Old 12-19-2014, 08:49:15 PM
Thaumaturge Thaumaturge is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

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Originally Posted by RSCurtis View Post
No need to wait for Mother Nature. Instead of water, cut a steel rod about a 1/2" shorter than the depth of the armature, and then thread the end of the rotor and use that and a bolt as a puller. Works every time.
It was actually doing such that led me -in desperation- to the freezing water method. It was on a small 1200w gen and there wasn't room for a very thick rod. 1/4" was about max size. Taper was particularly beligerant. I ended up bending rod inside cavity. Then what? Couldn't get rod out. Nothing seemed to work. Then I hit upon the freezing water plan. After separation I was able to remove highly mangled rod from other direction.
Doc
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Old 01-16-2015, 09:33:39 AM
Arkie Arkie is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

Good idea.

I've used heavy weight oil instead of water, stand the rotor up fill the hole with oil, add Teflon tape to the bolt threads and use impact wrench to run bolt into outer threaded end of rotor and hydraulic off the rotor. (little messy when it comes loose, oil spilling but works usually) I do like your redneck method of emptying the chest freezer to freeze the rotor shaft. Might have to rig a crane by the freezer to assist wiffee in lifting the gen in and out of the freezer for me. (so she don't drop the gen"s if it get frosty and slick)
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Old 03-01-2015, 01:14:16 AM
mronkar mronkar is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

I've used bearing grease the same way, with a clutch pilot tool instead of a bolt. fill with grease insert pilot tool and smack with a hammer.

But I've found out that all you need to do is place a piece of wood on it and smack that with a hammer, it will come loose.
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Old 03-06-2015, 09:48:55 PM
ckelp ckelp is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

the way i do it is use a chisel on the crank at the joint pops every time just can't give it a girly whack
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Old 03-06-2015, 11:14:17 PM
Thaumaturge Thaumaturge is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

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Originally Posted by ckelp View Post
the way i do it is use a chisel on the crank at the joint pops every time just can't give it a girly whack
Won't work on the China gens; gen head impeller blocks access to the joint.
Doc
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Old 03-07-2015, 08:37:30 AM
Arkie Arkie is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

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Won't work on the China gens; gen head impeller blocks access to the joint.
Doc
Right not enough room. But I've always suspected some of them little bitty Chinamen can get into tight places that we can't, judging by some of the stuff they put together.
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Old 03-07-2015, 11:23:43 PM
Thaumaturge Thaumaturge is offline
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Default Re: Absolute GUARANTEED trick for separating tapered shaft.

They have those beady little minds....
The Chinese are actually of larger stature than other orientals.
Doc
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