drube

Hi guys,
This is the first time i've had to mount a servo horn this way. What kind of screws / nuts and bolts do I use to mount my servo horn? Where do I get them and what size are they? They also look like Allen head bolts. I have the exact same horn that's in the pic.

Thanks

BuschBarber

My Feedback: (2)

I am guessing these servos have metal gears. The type of servo arm does not necessarily have anything to do with the screw used to hold the arm on. Microfastners is a good place to look for socket head servo arm screws. They carry metric as well as sae sizes. Just call them and give them the servo model. You could also ask the servo mfg.

drube

I don't understand why they would need to know the servo make and model? I'm looking for the 4 Allen head screws which could be used on any servo I would think. I will try microfastners to see what they have.
Thanks

karlik

That looks like a custom control horn mounted to a standard all round horn with 4 screws? If so, the allen head screws would be the same size as a ball link.

BuschBarber

My Feedback: (2)

I thought you were referring to the scree that holds on the servo arm to the servo output gear. I understand now that you meant the bolt on adapter arm.

drube

Yeah, this is the first time i've seen these horns. It's what came with my Aerobeez 30cc Sbach. I agree that it's mounted on a round horn, I will check to see if my ball link screws will fit.. They may be too long though.
Thanks

drube

No prob. I could have explained it better..lol

drube

I just checked and the ball link screws that came with the plane are too big.

A.T.

Use 2.56 DuBro screws and locknuts or, depending upon type and thickness of lower arm, small sheet metal screws
. Servo - Horn Arm Extension - DIY Alloy, FRP, CF & Nylon
. Servo - Horn Arm Spline Count and Inter Brand Compatibility

Much more information available under sub section
"Servo - Alterations, Calculators, Databases, Leads, Repairs, Convert to an ESC or winch & FAQ."
below
"Radio Systems, Accessories, Alterations and FAQ" at
Alan's Hobby, Model & RC FAQ Web Links

Alan T.

drube

Thank you! 2.56 it is then.

raptureboy

Why not just use a std servo arm like everyone uses?

AMA 74894

My Feedback: (1)

I used those on a 50CC Commander (review should be published here over the next couple days)
one thing I did slightly differently, your mileage may vary:
I installed the screws from the bottom of the servo arm, with the nuts on top. (the nuts are where the screw heads are in your pic)
this eliminates the possibility of the screws interfering with the servo body (if they are too long) and makes it obvious if a nut should come loose and fall off.
(use locktite on them too )

Raptureboy: these are used on larger airplanes where a longer servo arm (than standard) is desired. they're typically stronger too.

drube

Thanks, that makes sense to put the nuts on top.