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Old Mar 02, 2012, 11:59 PM
John Kim is offline
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How to remove wing servo which is epoxied?


The wing servo is epoxied to composite wing skin by previous owner.
The servo has broken gear and need be replaced but servo cannot be taken out without risk of damaging wing skin.

Any idea how to remove epoxied servo from the wing?
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Old Mar 03, 2012, 01:03 AM
DrakensFlyer is offline
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Is it possible for you to post some pictures so as to better evaluate the position of the servo in the wing, that way it would be better to asses what can be done to assist you.
Old Mar 03, 2012, 01:12 AM
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Yes, like DF says above, a picture or two would help.
I have heard of the entire servo being broken up, carved and ground out using a dremel.
I hope you don't want to repair that one!

My favourite way of fitting servos now is to first make a channel shaped recess for the servo out of splooge. I use an old servo wrapped in cling wrap for this. Then when cured, sit the servo in and glue only on the accessible side of the servo with a few spots of hot glue. When and if it has to be removed, its only a matter of heating a piece of wire which then can be used to melt the hot glue and pull it out.

All the best with it.

Jim.

edit: a variation of this for a moulded wing is to epoxy glue in two wood rails, one in front and one behind the servo to provide the "pocket" like the spooge does above. Then hot melt glue as above.
Last edited by Jim.Thompson; Mar 03, 2012 at 01:14 AM. Reason: see edit.
Old Mar 03, 2012, 06:38 AM
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If you want to remove an epoxied servo pour some vinegar onto the epoxy and then.... MAGIC the servo will be removed.

Vinegar acts as solvent for the epoxy..!!!
Old Mar 03, 2012, 09:20 AM
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I learn something everyday on these boards... how long does it take to soften up?
Old Mar 03, 2012, 10:47 AM
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Clamp a long Xacto blade to your soldering iron tip. If you can get it into the space where the epoxy is, a hot blade will cut through it.
Old Mar 03, 2012, 04:59 PM
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Quote:
Originally Posted by Ghost_ View Post
If you want to remove an epoxied servo pour some vinegar onto the epoxy and then.... MAGIC the servo will be removed.

Vinegar acts as solvent for the epoxy..!!!
That sounds good. However, how do you keep the vinegar off the epoxy wing skin at the same time?
Old Mar 04, 2012, 05:04 AM
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Apparently vinegar doesn't work on cured epoxy. Read post 7 here:
http://www.woodworkforums.com/archiv...p/t-58200.html

I don't see a good solution for you, I guess this is why people wrap servos with tape first!
Old Mar 05, 2012, 12:38 PM
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It needs about 20 minutes to soften... But be sure to put on plenty of vinegar. I suppose that you used epoxy glue to glue your servos not epoxy resin with cotton flocks or cabosil..!!!

That's how i removed my wing servos several weeks before but i had glued them with epoxy glue..!!

Hope i helped a bit

By the way vinegar doesn't penetrate the wing skins..!!
Old Mar 05, 2012, 03:08 PM
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Ghost, did the epoxy actually soften or did the vinegar just slip in between the bonding line and let the servo snap loose more easily? There's a big difference!
Old Mar 06, 2012, 05:22 AM
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Actually i didn't express it well the epoxy doesn't become soft such as rubber let's say. Vinegar slips between the bonding line and the servo is removed very easily. Moreover the epoxy from the wing surface unglues more easily if you add more vinegar after you have removed the servo
Old Mar 06, 2012, 11:06 AM
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Fair enough. Wicking in and breaking the bond makes a lot more sense. And thanks for the trick. I'll squirrel this idea away for some time when I need it.

Most likely it wouldn't work worth a darn for truly pourous materials like wood where the epoxy sets up a much more "root" like bond line deeper into the pores and grain of the material. But for plastics and metal where the bond line is quite flat I can see this being a handy trick.
Old Mar 06, 2012, 06:12 PM
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Vinegar problems.


Quote:
Originally Posted by Ghost_ View Post
If you want to remove an epoxied servo pour some vinegar onto the epoxy and then.... MAGIC the servo will be removed.

Vinegar acts as solvent for the epoxy..!!!
Ghost,
I've been trying to figure the logic of this since you posted the above. There are two possibilities:
1. The vinegar will dissolve the epoxy - act like a solvent as you say.
2. The vinegar will not dissolve the epoxy.

Either way, it presents problems.
In senario (1), there is a danger of the vinegar dissolving or weakening the epoxy wing skin.
Or in possibility (2), the method simply won't work.

Jim,

who is a bit puzzled.
Old Mar 07, 2012, 12:56 AM
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Quote:
Originally Posted by John Kim View Post
The wing servo is epoxied to composite wing skin by previous owner.
The servo has broken gear and need be replaced but servo cannot be taken out without risk of damaging wing skin.

Any idea how to remove epoxied servo from the wing?
I epoxy as an extra precaution most of my servos beside screwing them in, on few occasions had to remove them by using hammer and the chissel to tap them off, easy, Joe.


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