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Thread: Delicate engineering problem
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15th Nov 2020, 09:19 AM #46Gear expert in training
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If you want to try the glue route, Click Bond CB200 is the way to go; 5-10 minute cure and insanely strong. Might have some out of date sachets at work that are still perfectly functional but we can't use them because aerospace.
Rather than gluing the tool in place, it's probably easier to glue a nut on the end to get a socket on.
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15th Nov 2020, 10:16 AM #47Golden Member
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The CB200 looks like a very good candidate for this task.
To take the bonding process one step further if it has merit, I was thinking that the hex tool could be bonded to a dilled collar or nut, with a small length of the hex sticking out the bottom. What this would achieve is a belt and braces approach to the bond. The hex will bond inside the screw and the collar will bond to the flat top part of the screw. Therefore increasing surface area and strength.
If this method is to be used it would be very easy to do a quick bit of testing. Take a round bar and glue it in a stainless hex screw head. Bond a nut on the other end of the rod. Once cured take a torque wrench and see how much force it requires to brake the bond. If the head shears off you know you will get as good as possible.
I had a read of the SDS. It would appear that nitrile gloves are recommended for handling. Therefore a nitrile glove/sheet with a small hole can be placed around the screw head to form a protective barrier between glue and human.
This glue does not appear to generate heat when curing. This can be verified during the testing phase. I think for some of us we still ting of adhesives from 20 years ago. There are products that replace welds and CB200 appears to be one of them.
Good luck and I hope you get a solution soon.
Steve
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15th Nov 2020, 10:58 AM #48Most Valued Member
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Reidy and Elan I like the sound of the glue, if it works (and I hope it does) it certainly would be the quickest and easiest route.
If no joy there then my offer is still open
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15th Nov 2020, 11:14 AM #49Gear expert in training
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15th Nov 2020, 11:54 PM #50Diamond Member
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16th Nov 2020, 12:00 AM #51Diamond Member
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16th Nov 2020, 12:03 AM #52Diamond Member
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[QUOTE=Reidy41;1977318]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. [/QUOTE
yes. I 'assume' it was over torqued by trying to undo it the incorrect direction.
They did try that, using a Loctite product. Don't know what it was. Blue in colour.
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16th Nov 2020, 12:05 AM #53Diamond Member
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16th Nov 2020, 12:10 AM #54Diamond Member
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A little bit of heat would be ok. We could douse the shaft with water as a precaution anyway. ( heat will kill the bone so very bad!....)
Good thought about using ex AND a collar of some desprition....good stuff.
Thanks Gents.
You guys post too quick for me to keep up....lol
Steve
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16th Nov 2020, 05:53 AM #55
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16th Nov 2020, 01:01 PM #56Gear expert in training
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EDM requires the part to held perfectly stationary and totally submerged. Neither of those are practical with something that's physically attached to a living human and the non-zero risk of electric shock means that this is categorically a bad idea. Sorry, but there's no way of it being workable.
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16th Nov 2020, 04:56 PM #57Gear expert in training
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[QUOTE=Sterob;1977389]I think the blue stuff is just a thread locking compound, the real adhesive is red Loctite 680.
When I say a little bit, I mean you can barely even feel it, especially with the tiny quantity of glue involved here. I doubt it would even raise the area to body temperature.
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16th Nov 2020, 05:17 PM #58Senior Member
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16th Nov 2020, 06:47 PM #59Diamond Member
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https://www.gettoolsdirect.com.au/st...CABEgKtavD_BwE
I'm thinking lie on your back on a table and use a swivel vice like the link above, so it can be put in a comfortable position for your leg. I think the glue the driver to the screw idea is the best on here so far, so i would try that first.
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16th Nov 2020, 06:53 PM #60Diamond Member
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Deioinised water only works on Wire EDM where the cutting energy is low and flushing is good. On a sinker EDM the cutting energy is much higher and tends to turn the water to steam and cause problems. Also having been booted through my had a few times by a EDM i wouldn't like to know how it feels through a implant straight into a bone. Good thought but not really practical for this application.
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