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All Forums >> RC Airplanes >> Questions and Answers >> RE: Servo screws
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RE: Servo screws - 9/30/2011 10:02 PM   
bhorton


 

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Status: offline 		I use Dubro Socket Head Servo Mounting Screws like these:

http://www3.towerhobbies.com/cgi-bin/wti0001p?&W=000448338&I=LXFRM2&P=K

If the servo tray is light ply I add strips of aircraft ply under the tray and use CA to harden the threads in the wood like others have already described.

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RE: Servo screws - 9/30/2011 10:10 PM   
The Ghost



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quote:

ORIGINAL: MinnFlyer

Ooops. Edwin beat me to it

Yea, but you use pictures

Cheers

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RE: Servo screws - 9/30/2011 10:27 PM   
on_your_six


 

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Status: online 		So I am wrong??? The piston is counter balanced... sure there is some vibration, but the engine designer did the best they could. Until you try what I am telling you, you will never believe... sorry, your loss.

If you see this much vibration, there is usually something causing it. Does not cost a thing to check and balance these things.


quote:

ORIGINAL: MinnFlyer

No matter what you do, you still have a piston moving up and down.



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RE: Servo screws - 9/30/2011 10:52 PM   
Edwin


 

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Status: offline 		Yeah, somethin to be said for pictures. Minnflyer could a just posted the pics and said nothing. And it would have been understood. I'm a shoot from the hip guy, Minnflyer aims.
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RE: Servo screws - 9/30/2011 11:00 PM   
VF84sluggo



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Status: online 		Man, I've been making 'vibration-proofing' my cowl and canopy screws waaay too hard. I've been using wood like MN Flyer, but then using a blind nut, a socket-head screw, and then cutting thin 'washers' out of fuel tubing to use under the screw and metal washer. Problem is these fuel-tubing washers tend to squish out around the metal washer as the screw is tightened.

Tons of good tips here in this thread on easier ways to do this...sheesh, now you guys tell me

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RE: Servo screws - 9/30/2011 11:05 PM   
Edwin


 

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RE: Servo screws - 9/30/2011 11:58 PM   
Gray Beard


 

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Status: offline 		Prices of screws for hobby use tends to be a bit out of line. I placed an order, { I do this about every 5 years} and buy my screws and hardware from Micro Fastener. I just bought 4 bags of 100 2 X 9/16 servo screws, $4.90 per 100. I picked up several bags of 4-40 hex head screws and 2-56 hex heads then washers for them. I also ordered several bags of hardware for some friends at the same time. There are other places with the same items and about the same prices but I have used Micro for years so I haven't changed to another company. Once you have been in the hobby long enough you will find way better places then Tower to buy from but Tower is a great place for people just starting out, they have most everything for new modelers. They used to be a lot better but they are still where I send my new students.
Vibration: OK, fact, you can never balance a single cylinder engine so it doesn't vibrate. However, a well balanced prop can really cut down on vibration. I have tried using unbalanced spinners then a balanced one and there is little effect due to the center mass on the crank but even that can help dampen vibration. I have had some very smooth running twins though. Vibration is just the nature of the beast but there are a few things we can do to help remove it. Prop balance is the big thing. Different brands of props are also smoother running then others. You can never fully remove it but you can tame it.

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RE: Servo screws - 10/1/2011 12:26 AM   
mike31


 

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Status: offline 		Not sure. I have been flying for 35 years and have never had a servo screw come loose. maybe the hole you are inserting the screw into is to big? Maybe you need to get the engine balanced properly? Who knows?

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RE: Servo screws - 10/1/2011 12:28 AM   
mike31


 

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Status: offline 		I beg to differ with you on the balance issue for a single cylinder engine. I raced go karts for years and every Mac I ran was a single and was balanced. Just bigger but still a single cylinder!

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RE: Servo screws - 10/1/2011 1:04 AM   
All Day Dan


 

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Status: offline 		Jordan, use 3-48 screws into maple mounts. The screws fit the eyelets much better and the maple provides plenty of friction. Dan

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RE: Servo screws - 10/1/2011 1:40 AM   
on_your_six


 

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Status: online 		Single cylinder engines cannot ever be perfectly balanced. The crank shaft can be counter balanced, but there is always going to be a certain amount of vibration that cannot be eliminated as you convert a pumping piston motion into rotary energy.

What I am saying is that a pretty darn good job is being done, but when you throw on an unbalanced propeller and/or spinner vibration is very noticeable. Cure the effect of the vibration using the methods described here, but curing the cause goes a long way towards not needing the cure. It should also be pointed out that static and dynamic balancing are two different things... you are looking for a dynamic balance, but often the static balance is close enough. A sever imbalanced condition will soon wreck the firewall and other glued joints and plane, motor, batteries and electronics will not last very long at all... so when I first heard the OP's question... I was thinking vibration caused all the damage.

Engine designers have done a lot to reduce engine vibration... look at the huge rotary engines of WWII, look at the V8s and their crankshafts and how elaborately they are counter balanced.




quote:

ORIGINAL: mike31

I beg to differ with you on the balance issue for a single cylinder engine. I raced go karts for years and every Mac I ran was a single and was balanced. Just bigger but still a single cylinder!



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RE: Servo screws - 10/1/2011 2:50 AM   
Goran619


 

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Status: offline 		On our six is right I did initially balance my prop after the tips were painted but I inspected the prop and found a couple chips out of the painted tips. So I rechecked the prop it was a little out of balance so I added a small amount of CA to the tip and it balanced out perfectly. I also added more CA to the servo tray where the screws go in, let it dry and then added another drop to each hole then screwed in the servos so hopefully they will never come apart again. On the cowl I did drill out the cowl mounts a little bit and then stuck a piece of nyrod tube into each one then used some CA to secure them in. They cowl screws sure did tighten down nicely, I also added a washer to each screw to apply pressure to more than just the little screw head. Thank you all for the advice it was all wonderful as usual.
Thanks
Jordan


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RE: Servo screws - 10/1/2011 3:46 AM   
mlj3



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Status: offline 		While on the subject of servo screws,,Who makes the best ?? I have used some that where Great,I have also used some that either the Hex Head rounded out or the complete head rung off, I don,t remember where I brought the Bad ones. I think the best ones I brought where from Central Hobby Thanks In advance !!!

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RE: Servo screws - 10/1/2011 6:22 AM   
Gray Beard


 

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Status: offline 		Best????????? The word best is often a relative term. All of the screws I have gotten over the years look the same but have all been repackaged with the sellers label on them. I'm sure Micro Fastener is like NAPA, don't make anything but distribute under there name. A distributor is not a manufacture. I don't have any trouble with the items I have bought from Micro but I know I can twist the head off of any #2 screw. When I strip or round off the center of the head first place I look is the tip of my wrench. I quick lick on the grinder makes them good as new unless it's one of my round tips that hasn't broken off yet.
Mike, having something balanced doesn't mean it's a true balance. My bike engines were balanced as well as anyone could do but it wasn't a true 100% job. No reason to get into what I did to a VW engine but you can get darn close when you have 4 cylinders to work with.

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RE: Servo screws - 10/1/2011 12:35 PM   
VA-RC-POP


 

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Status: offline 		ALL OF THE METHODS DESCRIBED WILL WORK. MOST OF THE PROBLEMS WITH MOUNTING SERVOS IS THE INSTALLATION OF THE "BRASS" EYELET THAT GOES INTO THE RUBBER GROMET. IF YOU WILL LOOK AT THE PICTURES OF MOST OF THE SERVOS THAT ARE FOR "SALE" THE EYELET, IS INSTALLED UPSIDE DOWN. THE LARGE OR FLARED END OF THE EYELET GOES AGAINST THE WOOD, MOST OF THE SERVOS ARE MOUNTED IN WOOD. THIS LARGER END KEEPS THE EYELET FROM EATING INTO THE WOOD, CAUSING THE RUBBER GROMET TO BE MASHED TOO TIGHT. THIS KEEPS THE SERVO FROM BEING ABLE TO ABSORB EXCESS STRESS, AND ALSO HELPS KEEP THE SCREW TIGHT. BE SURE TO USE A SCRAP PIECE OF HARDWOOD, 1/4" sq. UNDER THE SERVO TRAY, USE THE HARDWOOD TO MAKE THE RAILS. NEVER MOUNT SERVO SCREWS INTO BALSA WOOD WITHOUT ADDITIONAL SUPPORT

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RE: Servo screws - 10/1/2011 1:19 PM   
Edwin


 

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Status: offline 		I forgot to mention that I sometimes us the white plastic washers on the cowl screws. RTL and Micro Fasteners sell the washers with a rubber surface on one side.
Edwin

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RE: Servo screws - 10/1/2011 2:33 PM   
MinnFlyer



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quote:

ORIGINAL: on_your_six

If you see this much vibration, there is usually something causing it. Does not cost a thing to check and balance these things.

You're insinuating that I don't balance my props. I do (at least the larger ones). Screws still vibrate loose. Rather than drive myself crazy for hours researching where the mysterious vibration is coming from, I find it much easier to secure my screws.



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RE: Servo screws - 10/1/2011 4:50 PM   
DIYER


 

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Status: offline 		For mounting cowls and canopies I use plywood or hardwood blocks into which I tap and thread 4-40 holes. After dripping some CA into each hole for hardening the wood, I screw on the canopy/cowl with 4-40 nylon bolts. The nylon bolts absorb vibration and, if there is severe stress, the bolts will break before the blocks, so replacement is easy.

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RE: Servo screws - 10/1/2011 7:55 PM   
BarracudaHockey



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Status: offline 		Six is correct, no way to cost effectively balance a single cylinder model engine unless they start using tungsten counterweights, but then that wouldn't be cost effective

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RE: Servo screws - 10/1/2011 8:40 PM   
jester_s1


 

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Status: online 		Even if the engine and prop is balanced perfectly, we still get pressure pulses from only having one cylinder which causes a twisting vibration. It's very noticeable when the plane is sitting at idle, and aside for adding a harmonic dampener there's nothing we can do about it.

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RE: Servo screws - 10/1/2011 8:45 PM   
huck1199



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Status: offline 		Anyone ever produced a dampening spinner? 

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RE: Servo screws - 10/1/2011 11:44 PM   
Old Fart


 

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Status: offline 		Good tip on the nyrod,i've been using tiny wallplugs they work great

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RE: Servo screws - 10/3/2011 6:51 PM   
Radical Departure



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quote:

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.


Same screws and method I use. Never had a problem with them when installed that way.

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