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Thread: Delicate engineering problem
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13th Nov 2020, 08:53 PM #31Golden Member
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QUOTE: I've never used a nut splitter so I was wondering if anyone who has used one, what they're thoughts were?
For your application it sounds a bit like using a sledge hammer to drive a tack, However.......
Hopefully a photo of my nut splitter is attached. It will accept nuts up to 32mm across the corners. The nut is split by a 10mm wide cold chisel driven by a very fine thread 17mm bolt.
It takes a lot of torque on the bolt to split a 1/2" Whitworth nut. The body of the splitter has a hex shank which can be held with a second spanner to stop it twisting while the bolt controlling the cold chisel is being turned. I think things could get out of control here in your application, but if you want to try it you are welcome to borrow the splitter. PM me your address and I will post it over.
Hope you can sort it out one way or another fairly quickly.
Regards,
Frank
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13th Nov 2020, 09:54 PM #32Senior Member
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My first thought is a ring splitter, used to remove wedding etc rings from fingers.
Normal gold cuts quite easily with a tiny hand turned slitting saw type thing, which I doubt would cut s/s but they also have a nut splitter type one for titanium /platinum /ceramic etc.
The geometry may be wrong, but possibly adaptable.
I sense you aren't looking for a bargain basement option...
To drill without heat or vibration, could a hand drill work? No idea how that would go for s/s though.
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13th Nov 2020, 10:57 PM #33Diamond Member
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Thanks Frank.
'deperate times call for desperate measures....' Actually, I thought a nut splitter would be the least violent method of removing the bushing as it would happen in a controlled manner.
I was wondering about the torque. That might exclude a manual splitter as a hydraulic one would not have that problem.
Thanks for the offer, but if I was to use one, I'd just buy one. They are not expensive, I don't think.
We are aways for that anyway. I would need to convince the prostethist that it was the way forward first.
Steve
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13th Nov 2020, 11:04 PM #34Diamond Member
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Do you mean 'Ring Cutter'? A hand turned cutting disc with a backing section that slides under the Ring?
No, that won't work. No access to the inner section of the Bushing.
Sorry...Still can't post a pic.....even a 49kb pic....
This is an old pic of the rear of the Bushing. The screw fills the whole void.
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14th Nov 2020, 12:13 AM #35I break stuff...
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One thing worries me a bit about the splitter... It's been a long time since I've seen one used, but to my mind before the collar splits, it's going to deform. Some expansion will go sideways in the desired direction, but it also seems like it will expand up and down - against the underside of the capscrew, and against the mating surface. How critical is the flatness of the surface the collar sits on? I can't quite tell if that part is removable from the earlier link... And the other concern following the same train of thought - if it fails to split the collar, the deformation from the attempt is effectively going to make the capscrew tighter than it already is....
Unfortunately I don't have any better ideas either - best I can come up with is dremeling a decent slot into the capscrew for a big flat blade screwdriver. Not exactly guaranteed success, and doesn't avoid the "time-consuming and uncomfortable" parts. Although I did wonder since you mentioned heat being a problem, whether there was a possibility to wrap an icepack around the area in some way to counter the heat? Probably a stupid suggestion though...
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14th Nov 2020, 12:50 AM #36China
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I may this all wrong and if I have just ignore me, would it not be possible with suitable shielding to cut the collar with a Diamond disc it in a flex shaft or similar
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14th Nov 2020, 08:23 AM #37Most Valued Member
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Steve what size allen key is supposed to fit the bolt?
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14th Nov 2020, 10:09 PM #38Diamond Member
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Yes, I was thinking it might expand inwards and outwards, stretching the thread in the Abutment. It seems to be my biggest concern.
IF I can stand the vibrations from demeling, that might work. Might be a long process as well. That would preserve the Bushing anyway.
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14th Nov 2020, 10:12 PM #39Diamond Member
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14th Nov 2020, 10:13 PM #40Diamond Member
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14th Nov 2020, 11:55 PM #41Senior Member
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Like this.
https://www.titaniumstyle.com/titani...ng-cut-off.htm
My memory deceived, I thought there was a splitter type tool but the diamond blade/no heat sounds promising.
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15th Nov 2020, 05:47 AM #42
Do You have a mate with an EDM?
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15th Nov 2020, 07:45 AM #43Diamond Member
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How do you plan for this to work? the bolt is attached to his leg, so a edm will cover him in nasty oil, and electrocute him.
I think the best option might be to try to dremel it out. would it be possible to fixture the exposed bush to a bench or similar to dampen the vibrations going into your leg?
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15th Nov 2020, 08:48 AM #44Most Valued Member
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Steve there is a chamfer there between the disc and the bit it is attatched to, that might be enough to engage a matching vee formed into a split cylinder that would be threaded at the other end for a bolt that would push a splined bit, similar to a torx tool, into the damaged head of the bolt.
The bolt would then be removed and socket inserted to turn the bit to undo the bolt.
If you would like to try this I could make it if you like but i would need some measurements.
These pics might give you an idea of what i am thinking??
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15th Nov 2020, 09:02 AM #45Golden Member
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I am guessing all ideas are a starting point, so here is one. If i understand correctly the hex is rounded out and the bolt is over torqued.
In the aeronautical industry there are some really strong metal bonding "glues". Can you "bond" the hex tool in place. Once cured the screw may undo.
Steve
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