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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Thread locker problem
10-30-2006 01:59 AM  12 years ago
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gmcullan

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Southbridge, MA

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Thread locker problem
A quick question if anyone else has experienced this. I've been assembling a HDX300 electric powered micro heli. I've been using Loktite brand blue thread locker, but this time, when I used it on the servo mounting screws, within a matter of hours it had dissolved and ruined the servo mounting ears on my S75 servoes. Anyone else have this problem? Luckily, the replacement cases are not that expensive. But in all the years I've enjoyed R/C I've never had this problem.
Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450
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10-30-2006 02:15 AM  12 years ago
cudaboy_71

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sacramento, ca, u.s.

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you're supposed to use CA on plastic (if anything). loctite is for metal to metal only. loctite (obviously, to you now ) melts plastic.if it ain't broke, break it.
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10-30-2006 02:16 AM  12 years ago
kangarooster

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Orlando Fl-USA

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Loctite is not compatable with many types of plastic.
I have used CA instead.
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10-30-2006 02:48 AM  12 years ago
JAGNZ

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Auckland, New Zealand

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Yup, Loctite melts plastic, use CA into plastic.
Jason Greenwood

www.3dheli.co.nz
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10-30-2006 02:53 AM  12 years ago
andyp

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New Zealand

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Plastic is really self locking. However, if you feel necessary, Taymia sell a plastic compatible threadlocker which works well. I would not use CA unless you plan on never removing the screw - the threads in the plastic get destroyed if you remove the screw, and certainly damaged even if you use only a little CA.

However, your servo ears have been destroyed by the loctite - perhaps you are actually using metal bolts into a metal frame? If that is the case, just use a lot less loctite and be careful not to get it onto the servo case.

If you are using metal screws threading into plastic, I would suggest no loctite, or use the Taymia plastic threadlocker I have mentioned.

Andrew
QuickUK Flight Team
Fromeco Regulators and Batteries
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10-30-2006 03:11 AM  12 years ago
JAGNZ

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Auckland, New Zealand

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Good point, I was meaning into parts that were never meant to part.

The BEST way to use Loctite is to put a drop on the threads and then to slowly turn the bolt on the tip of your finger. That will leave only a small amount in the thread indentations, which is the correct amount. Wipe the excess off of your fingertip and you are done.

People tend to use WAY too much Loctite in my experience.

Jason Greenwood

www.3dheli.co.nz
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10-30-2006 03:11 AM  12 years ago
gmcullan

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Southbridge, MA

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Yes, the DHX300 servo mounting uses hex head screws that go into threaded metal brackets. With all the servos I've mounted over the years I've never had that problem. Knowing the issue, I'll just switch to plastic compatible thread locker.Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450
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10-30-2006 03:20 AM  12 years ago
cudaboy_71

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sacramento, ca, u.s.

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The BEST way to use Loctite is to put a drop on the threads and then to slowly turn the bolt on the tip of your finger.
dunno if that's the BEST. but, it definitely gets the right amount in the threads. the BEST solution would be one that didnt get your fingers all messy.

i use a drop on the end of a straight pin and let it wick into the threads, myself.
if it ain't broke, break it.
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10-30-2006 03:24 AM  12 years ago
rcmike

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Dickson, TN

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While at an autoparts store the other day I saw some kind of loctite stick that you rubbed on the bolt. Has anyone tried that? Seems a lot less messy if it works.
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10-30-2006 03:34 AM  12 years ago
cudaboy_71

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sacramento, ca, u.s.

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manufacturers use that stuff during assembly. i've found it on both century and align stuff, anyway.if it ain't broke, break it.
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10-30-2006 06:21 AM  12 years ago
Two Left Thumbs

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Houston, Texas - USA

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rcmike I use the stick stuff on my car restoration projects. Easy to apply, and does not drip. The only problem I have is that I store it in my garage, which gets hot in the summer. The problem is the spiral shaft which you turn to push up fresh stick burrows right through the warm stick, so I end up having to scrape it out of the canister.
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