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  • 1 Post By rcflyerheli
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Old 03-18-2019, 09:41 PM   #1 (permalink)
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Default 3mm Turnbuckles with 2.5mm ball links

Hey Guys,

I had the FBLRotors turnbuckles on my 550 and they were 3mm turnbuckles fitted with genuine Mikado 2.5mm ball links. I had spares but have run out and looking at making my own.
Does anybody know if Ralf from FBLRotors drilled out the hole in the ball link prior to fitting the turnbuckle.
I tried screwing one in yesterday without drilling out the hole and noticed it caused the ball link to expand.

Any help would be greatly appreciated.

Cheers
MickeyZ
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Old 03-18-2019, 10:47 PM   #2 (permalink)
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I just run in either a 3mm tap drill or a 4-40 tap drill, which ever one I find first in my bench drawer. I've not had one break where I drilled it, but a couple have broken out by the ball in a crash.


If you don't drill them out, they will be too tight to be effective at adjusting the lengths of the links.
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Old 03-19-2019, 01:36 AM   #3 (permalink)
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Thanks Mate, Yeah never had any of the FBLRotors ones fail during flying. And the same as your experience they seem to break a lot easier in a crash

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Old 04-26-2019, 11:30 PM   #4 (permalink)
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If you drill them out, do you just let the 3mm turnbuckles self tap, or did you use left and right hand tapered taps?
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Old 04-27-2019, 09:56 PM   #5 (permalink)
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I've never run a tap into the drilled out links. I just screw them onto the rod.
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Old 04-27-2019, 11:33 PM   #6 (permalink)
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Thanks rcflyerheli, sounds EZ enough...
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Old 04-28-2019, 08:03 AM   #7 (permalink)
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Quote:
Originally Posted by HelisRock View Post
If you drill them out, do you just let the 3mm turnbuckles self tap?
Yes. Let the turnbuckles self-tap into the plastic link.
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Old 04-28-2019, 08:33 PM   #8 (permalink)
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Thanks curmudgeon!
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Old 04-29-2019, 05:47 AM   #9 (permalink)
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I put a 3mm tap in a plastic link and it was not a tight fit when I put the rod in.

I think it would be better to drill out with tapping drill, 2.5mm is correct for metal but 2.6mm would probably be a little safer in case the plastic is a little brittle.
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Old 05-08-2019, 04:45 PM   #10 (permalink)
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I ended up drilling mine out with a 2.5mm drill then used the turnbuckle to cut the thread into the link.

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MickeyZ
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