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Servo horn hole too big - 10/27/2012 2:01 AM   
lennyk


 

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From: Port of Spain, FL, USA
Status: offline 		I accidentally enlarged the hole on my nylon servo horn a bit too big, now the 2-56 z-bend is a bit loose.
Unfortunately this servo is glued into a composite wing f5b glider.

Any suggestions on taking up the slop ?

Thanks,

L

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RE: Servo horn hole too big - 10/27/2012 2:16 AM   
flyinwalenda


 

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From: Hunlock Creek, PA, USA
Status: online 		I guess you don't want to cut the servo out ?
Can you get a right-angle screw driver in to remove the screw and put a new arm on?
 Heat shrink on the rod would probably increase the diameter too much to fit in the hole . Even then it will give way eventually.  I don't think there is a good "fix" for this that will last other than to change the arm.

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RE: Servo horn hole too big - 10/27/2012 3:04 AM   
lennyk


 

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From: Port of Spain, FL, USA
Status: offline 		I sanded the z-bend, put solder flux and then added some solder to it.

Sanded it down and it is tight now, dunno how long the lead layer will last though but I guess it is better than before.


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RE: Servo horn hole too big - 10/27/2012 4:33 AM   
Charlie P.



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From: Port Crane, NY, USA
Status: offline 		Flip the servo horn?  Or just buy another horn.  Several companies sell arms for various mfg servos.

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RE: Servo horn hole too big - 10/27/2012 3:04 PM   
jester_s1


 

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Status: offline 		Lead is harder than plastic, so you should be good to go.

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RE: Servo horn hole too big - 10/27/2012 3:12 PM   
LesUyeda



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From: San Diego, CA, USA
Status: offline 		"Lead is harder than plastic, "

Not really. I would keep a close eye on it.

Les

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RE: Servo horn hole too big - 10/27/2012 4:17 PM   
ARUP


 

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From: Taylorsville, KY, USA
Status: offline 		Can you apply soldering iron tip to servo horn to melt the plastic? Push it around while soft to 'tighten' the hole then redrill. Try it on scrap horn first. Or... put a next size up wire with 'Z' bend on it if possible. Or... put a small piece of plactic tube that fits your 'Z' in servo horn after re-drilling to fit. Good luck!

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RE: Servo horn hole too big - 10/27/2012 4:29 PM   
blvdbuzzard



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From: high deserts, CA, USA
Status: offline 		Drill out the hole even more, press fit a piece of brass tubing to reduce the hole size. Solder a piece of brass tube onto the push rod.


Buzz.

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RE: Servo horn hole too big - 10/27/2012 6:25 PM   
karolh


 

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Status: online 		Enlarge the pushrod hole then roughen the inside edges and fill with JB Weld. When dry redrill the hole to fit the pushrod.

Karol

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RE: Servo horn hole too big - 10/29/2012 1:13 AM   
KitBuilder



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From: Palm Harbor, FL, USA
Status: offline 		The moral of the story..... fit the pushrod before making a servo inaccesible (I;ve been in the same situation... only once though)

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RE: Servo horn hole too big - 10/29/2012 1:22 AM   
karolh


 

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Status: online 		It happens to the best of us

Karol

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RE: Servo horn hole too big - 11/9/2012 1:31 AM   
bikerbc


 

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From: SorrentoBritish Columbia, CANADA
Status: offline 		I did that to a whole set of mine not realizing it and then when I started flying the plane it was making this rattling noise that I wasent sure where it was comming from...I finally realized the z bends were loose in the holes...I poked around in my clevises and I found some clips that I think are for L bends..Anyway they clip onto the wire and slide forward and clip on to the L Bend or in this case the Z bend...It takes all the slack out and no more rattle....

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RE: Servo horn hole too big - 11/9/2012 4:14 AM   
tacx



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From: washington twp., MI, USA
Status: offline 		Forget about the z bend and try a nylon clevis. Some nylon clevis's have a large pin.

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RE: Servo horn hole too big - 11/9/2012 4:04 PM   
daveopam



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From: ELK CITY, OK, USA
Status: online 		I would put a ball link on it and never worry again. If you have the clearance that is.

david

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RE: Servo horn hole too big - 11/9/2012 11:23 PM   
combatpigg



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From: arlington, WA, USA
Status: offline 		It really helps to have a numbered drill index for rigging RC model controls. HF sometimes has them for about $10. The other item is a $20 dial caliper or digital caliper to take accurate measurements of all this tiny stuff we play with.
I sometimes sharpen the end of whatever size pushrod I want to use, then heat it with a propane torch just hot enough to push it through an existing servo arm hole. This has worked for me. I also use a drop of oil after the "Z" bent wire has been installed to prevent the junction between the wire and the servo arm from wearing out.


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RE: Servo horn hole too big - 11/10/2012 3:26 AM   
redjeep


 

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Status: online 		Use a larger diameter pushrod?


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RE: Servo horn hole too big - 11/10/2012 3:39 PM   
JulieT


 

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From: Colbert, WA, USA
Status: offline 		 Depending where the arm is actually located (ability to get to it) :
1. (the better of the two solutions) - take a scrape piece of a servo arm and a flat tip screw driver. place the scrape piece of the arm onto the flat end of the screw driver and heat until the scrap piece starts to melt. Make sure it doesn't catch fire (if using an open flame which should be use as a last resort) and that it doesn't start turning colors (that is, getting burnt). With the z-bend still in the over-size hole, slide the screwdriver in (melted scrap piece up) and flip it over onto where the z-bend meets the over-size hole. Let is cool for a few seconds then move the servo. You might need to repeat until the hole is filled in.
2. Heat up a pair of needle nose pliers and just squeeze the hold smaller.

However if you have the space to get to it, I would agree with tacx and use a nylon clevis.

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RE: Servo horn hole too big - 11/10/2012 5:10 PM   
dadragon


 

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From: pine bluffs, WY, USA
Status: offline 		do you have room to put in a ball link?

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