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Servo screws

Old 09-29-2011, 02:40 PM
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Goran619
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Default Servo screws



What methods can be used to secure the servo screws into the servo tray? Ijust maidened my P-47 yesterday and after I took it apart today to make sure everything was tight still I found 4 servo screws on 2 different servos had came loose and fell out. I did put a few drops in the threads but that obviously didn't make a difference. Ialso had all the cowl screws come loose and 1 fall out, a guy at my fieldtold me to put silicone on them to keep them in place. so do Ijust put this on the threads and then screw them in? Ineed to find ways too hold the screws in place from the vibration of a DLE20. Any tips would be appreciated.
Thanks
Jordan

Old 09-29-2011, 03:21 PM
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DMcQuinn
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Default RE: Servo screws

Do secure the screws with some threadlocker (or silicone). Also check your propeller. If it is out of balance, this will exacerbate the problem.
Old 09-29-2011, 04:03 PM
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Goran619
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Default RE: Servo screws

does threadlocker hold screws into wood?
Jordan
Old 09-29-2011, 04:45 PM
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BalsaBob
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Default RE: Servo screws

No, do not use threadlocker. I always use a drop of medium CA (Zap a Gap).

Bob
Old 09-29-2011, 06:07 PM
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Gray Beard
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Default RE: Servo screws

I get my screws from Micro Fastener, hex head screws. I pre-drill the holes under size, thread the screws in then back out. Add a drop or two of thin CA then let it set up. Now install the servos and tighten them down good.
Old 09-29-2011, 07:51 PM
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KW_Counter
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Default RE: Servo screws

I follow Gray Beard's procedures.
KW_Counter
Old 09-29-2011, 08:10 PM
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Default RE: Servo screws


ORIGINAL: Gray Beard

I get my screws from Micro Fastener, hex head screws. I pre-drill the holes under size, thread the screws in then back out. Add a drop or two of thin CA then let it set up. Now install the servos and tighten them down good.

Gray Beard's got the goods! I do exactly what he does then I add a drop to each screw and drive them home, never had one come out yet (knock on balsa...) Every once in a while the rubber grommet gets glued too, but small price to pay to make sure your servos stay on the job. Metal to metal ALWAYS needs thread locker of some sort, if at all possible, run with nylon lined nuts (but not both), they are Gump proof!
Old 09-29-2011, 10:40 PM
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jester_s1
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Default RE: Servo screws

If you'll put a drop of thin CA into a threaded hole and let it cure, you'll get hardened threads that will hold the screw well. The wood swells a bit too so it'll be vibration resistant but removable.
Old 09-30-2011, 03:22 AM
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jbdismukes
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Default RE: Servo screws

Old 09-30-2011, 04:25 AM
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Default RE: Servo screws

As for the cowl, go to JR Hobby Hardware and order a bag of sealing washers. They are the bomb diggity for holding cowls without loosening or hurting the cowl.
Old 09-30-2011, 04:33 AM
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K-Bob
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Default RE: Servo screws

Or these #4 stainless bonded washers

http://www.microfasteners.com/catalo...ts/WASFWRB.cfm

Old 09-30-2011, 05:16 AM
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carrellh
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Default RE: Servo screws

Sometimes the servo tray is made out of poor wood. In those cases a 'doubler' can give the screws something to grab better.
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Old 09-30-2011, 06:07 AM
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Default RE: Servo screws


ORIGINAL: K-Bob

Or these #4 stainless bonded washers

http://www.microfasteners.com/catalo...ts/WASFWRB.cfm

Same thing, same price.

http://www.jrhobbyhardware.com/shop/...roducts_id=280
Old 09-30-2011, 06:22 AM
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Edwin
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Default RE: Servo screws

For the cowl, I counter sink some 1/4" to 3/8" pieces of nyrod into hardwood mounts and glue them in with CA. The screws are screwed into the nyrod. They wont come out that way.
Edwin
Old 09-30-2011, 06:24 AM
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Default RE: Servo screws

The best way I have found to keep cowl (or canopy) screws from coming out is to enlarge the hole in the block to 1/8" and glue a piece of nyrod tubing into it. make the tubing a little longer than the block to be sure it is fully glued in place. You'll need to tap it in with a hammer. Then enlarge the hole to 5/64".

Now a #2 screw (standard servo size) will screw into the nyrod and will never vibrate loose!
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Old 09-30-2011, 06:26 AM
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Default RE: Servo screws

Ooops. Edwin beat me to it
Old 09-30-2011, 06:27 AM
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Edwin
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Default RE: Servo screws

Great minds think alike. What can I say, it works. Picked it up from an old timer many years back.
Edwin
Old 09-30-2011, 06:33 AM
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Default RE: Servo screws

Yes, but I DO recommend making the tubing as long as possible and enlarging the hole. The standard hole is ok, but a bit tight and the last thing you want is to have the nyrod break loose. If it does, it's a bear to get out!
Old 09-30-2011, 07:00 AM
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Default RE: Servo screws

Where can you pick up nyrod tube? Are there differnt size tubes? And do you make it flush with the cowl block? Thanks for all the advice I appreciate it thank you.
Jordan
Old 09-30-2011, 07:45 AM
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carrellh
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Default RE: Servo screws

It is the "inner" rod of something like Sullivan Gold-N-Rods http://www3.towerhobbies.com/cgi-bin...?&I=LXFU91&P=0
This pair wouldd probably give a lifetime supply to multiple people.
Old 09-30-2011, 08:25 AM
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Default RE: Servo screws

Use Dubro socket head servo head stews. This will stop the cheap servo screws
From having the heads strip and or the driver slipping and Puting a hole in your new plane.

You can pick up those neopreme backed washers at any hardware store..
Old 09-30-2011, 09:04 AM
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Default RE: Servo screws

I go back and forth .sometimes depending on the size of the screw I use medium ca.and other times I insert a piece of yellow nyrod and screw into it.both work exyremely well.
Old 09-30-2011, 10:53 AM
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Default RE: Servo screws

Is everyone missing the obvious??? The cause is vibration... you need to check and see what is so out of balance... did you balance your prop? what about the spinner? These two things can shake a plane to pieces.


ORIGINAL: Goran619



What methods can be used to secure the servo screws into the servo tray? I just maidened my P-47 yesterday and after I took it apart today to make sure everything was tight still I found 4 servo screws on 2 different servos had came loose and fell out. I did put a few drops in the threads but that obviously didn't make a difference. I also had all the cowl screws come loose and 1 fall out, a guy at my fieldtold me to put silicone on them to keep them in place. so do I just put this on the threads and then screw them in? I need to find ways too hold the screws in place from the vibration of a DLE 20. Any tips would be appreciated.
Thanks
Jordan

Old 09-30-2011, 11:00 AM
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Default RE: Servo screws

No matter what you do, you still have a piston moving up and down.
Old 09-30-2011, 11:09 AM
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Default RE: Servo screws


ORIGINAL: carrellh

Sometimes the servo tray is made out of poor wood. In those cases a 'doubler' can give the screws something to grab better.
This just hit me this morning. I epoxy a 1/8 piece of aircraft ply on the bottom or back of the area the screws are going to go through. Most servo trays that are supplied are just 1/8 thick and don't hold well. I also use the nyrod in a lot of places, good stuff. I use the nyrod for the throttle on gas powered planes too so I always have it on hand.

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