Servo horn hole too big
10-26-2012, 05:01 PM
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Servo horn hole too big
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
Unfortunately this servo is glued into a composite wing f5b glider.
Any suggestions on taking up the slop ?
Thanks,
L
10-26-2012, 05:16 PM
#2
RE: Servo horn hole too big
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.
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.
10-26-2012, 06:04 PM
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RE: Servo horn hole too big
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.
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.
10-27-2012, 07:17 AM
#7
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RE: Servo horn hole too big
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!
10-27-2012, 07:29 AM
#8
RE: Servo horn hole too big
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.
Buzz.
(I;ve been in the same situation... only once though)
11-08-2012, 05:31 PM
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RE: Servo horn hole too big
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....
11-09-2012, 03:22 PM
#15
RE: Servo horn hole too big
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.
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.
11-10-2012, 07:39 AM
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RE: Servo horn hole too big
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 spaceto get to it, I would agree withtacx and use a nylon clevis.
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 spaceto get to it, I would agree withtacx and use a nylon clevis.
