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HomeAircraftHelicopterHIROBOHirobo SDX › Where to use thread lock
01-15-2010 11:13 PM  8 years agoPost 1
arhennie

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Norway

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For the moment I'm assembling a SDX 50, (as my first Hirobo build).
When following the instruction manual I think it is very few places where thread lock is recommended.

I'm used to add threadlock on all metal screws going into metal threads. But here it is sveral places this is not recommended by the manual.
One places for instance is the metal nuts used for bolting the two main frame halves together. (These nuts are not nylock).
Another is the small setscrews for securing the flybar rod.

So how do you guys do this when building your Hirobo's.
Do you follow the manual, do you use threadlock on all metal, or maybe something in between?

arhennie

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01-16-2010 12:15 AM  8 years agoPost 2
FlaG8r

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Florida

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I would use blue loctite on ALL metal to metal. As long as it's not a nylock nut.

Life is tough, it's tougher if you're stupid

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01-16-2010 01:06 AM  8 years agoPost 3
Leif

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USA

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Both the frame bolts and the flybar lock grub screws need thread lock.

Personally I like green threadlock for the frame screws and also the bolts that hold the tail halves together. Green (290) is more oil resistant and holds much stronger than blue threadlock.

For metal to plastic, I use regular "super glue" or CA. I also use CA as a replacement for threadlock on any "M2" size nuts and bolts, such as those used for link balls. CA holds much better than threadlock, and is easily loosened on these fasteners due to the small amount of surface area.

Leif

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01-16-2010 02:28 AM  8 years agoPost 4
TheWoodCrafter

rrKey Veteran

Costa Mesa, Ca.

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I used blue on all metal to metal and CA on all metal to plastic.

I don't think you can hurt anything by adding thread lock.

A couple of other things to do -

Tap the holes in the swash plate before threading in the balls.

File flat spots in the flybar where the set screw sit.

Take your time dialing in the starter shaft. Balance the fan/flywheel.

Thanks, TheWoodCrafter

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01-16-2010 03:22 PM  8 years agoPost 5
Skybolt

rrApprentice

Ontario, Canada

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Another thread locker that I have use with success is the Loctite 222 (purple) on 3mm set screw in metal. It was design for small screw.

Set screws are notorious to strip and are sometime difficult to remove.

Whit the purple Loctite set 3mm set screw have hold very well and are removable without striping them.

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01-16-2010 05:06 PM  8 years agoPost 6
GMPheli

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W. Bridgewater, MA USA

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"Green (290) is more oil resistant and holds much stronger than blue threadlock."

Too strong IMHO. I have had problems getting things apart after using 290.

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01-16-2010 06:29 PM  8 years agoPost 7
rexxigpilot

rrProfessor

Florida

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I was perplexed by this when I built my SDX too. I built mine according to the manual with regards to using threadlock. I have not had a single loose nut or machine screw.

The frame side is moulded with indentations to capture the nuts. This prevents the nut from rotating and loosening.

I also did not use threadlock on the flybar set screws and they are still tight. The manual says to set them temporarily on page 22, but never says anything about resetting them after centering the flybar. I guess threadlock should be used here.

This was my first Hirobo build. Many build steps were strange to me like using threadlock on the balls that attach to the plastic swash. I always heard that threadlock eats/softens plastic. Must be a special plastic.

Take head to what Woodcrafter said about the filing flats on the flybar where the set screws go or you can't get the flybar back off again. And definitely dial indicate and balance the fan/hub/clutch assembly including the start shaft. You will be rewarded with a smooth running heli if you do. Otherwise, get ready for some serious vibrations in the frame, landing gear and tail fin.

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01-16-2010 07:11 PM  8 years agoPost 8
arhennie

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Norway

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Before I posted my initial question I had just finished the flybar part of the build, and Mounted the head on the heli. Up to then I had followed the manual regarding thread lock, but with a few exceptions. As like rexxigpilot here i dont like using locktite in plastic, so I used CA on the outer swash balls instead. Also I have used locktite on all setscrews, like the ones on the flybar.

I was thinking about loosen those frame bolts again and lock them, but after reading rexxigpilot's experiences I think I leave them as is. I will check them after flying to make shure they dont get loose.

Tapping the swash I have read about before, and this I did. Dialling the shaft I didnt know about. Thanks WoodCrafter for the tip.

Flat spots in the flybar I did not make. It will probably be like rexxigpilot says here. I wont probably get it off again. I noticed during assembly when I tightened a little too hard, how the grooves made by the setscrew really got stuck in there. I think it will never get loose.
But on the other hand I'm not really shure how to do it right. It's four spots, and at least those two in the middle should probably line up pretty good to avvoid twisting that "cage". Perhaps the trick is to file down very little...

arhennie

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01-16-2010 10:12 PM  8 years agoPost 9
Leif

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USA

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"Green (290) is more oil resistant and holds much stronger than blue threadlock."

Too strong IMHO. I have had problems getting things apart after using 290.
I only recommend 290 for the frame bolts and the bolts holding the tail together. The green loctite holds very well, but is also easy to remove for these particular bolts. I do not recommend using 290 for any other locations as it may be too strong.

Leif

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01-17-2010 12:22 AM  8 years agoPost 10
RussJ

rrApprentice

lockport, new york usa

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I have had good luck with the blue loctite. I use it on all the metal bolts. Especially the frame bolts since they do not have locknuts on them. It is a good idea to check all the bolts from time to time though.

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01-17-2010 05:32 PM  8 years agoPost 11
payne1967

rrElite Veteran

uk

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on the frame i swopped the cross head screw to cap head allen screws and used nyloc nuts
i learnt this trick after loctiting a shuttle together
and then had the joy trying to remove the screws

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