Servo Grommets...

[Xlerator]

Hi,

Well i heard about servo grommets from a member of another board. They said that Servo grommest help prevent the servo tabs from flaring out and breaking like what happens when you over tighten the screws. So i got 2 packs from the hobby shop. I know the servo grommets are for airplanes and heli's, but i was told they can be used on cars to. Now i was also told that they cannot be used on land rc's becasue of the "cushioning" they give. So are these safe to use on land RC's??? Thanks for the input, i'd really like to use my $5 i spent on the grommets to good use. Thanks!

PS: The brass bushing that came with the grommets are to small for my servo mount screws, is it ok to use the rubber grommets without them???

[AudiTT-Quattro]

Yes, I HIGHLY recommend them to prevent servo glitches, stripping gears, and breaking the ears off. Most of the time, servo problems are caused by vibrations that aren't noticed when moving the car when the servo is stationary.

Use them if you have room. It doesn't matter if you use the brass rings that come with them or not.

PS: Most servos come with grommets; I see no reason to pay $5 for them. Ask your pit neighbor for them if he/she throws them out.

[Xlerator]

Hey thanks for the quick reply. I'll be sure to se thme now :D . They were $2.50 for a set of 4. Thanks again. Anymore input??

[Railman]

I run them on all of our nitro trucks, but not on electric. Nitro is extremely hard on servos. If I were racing at the highest level, I probably wouldn't use them, but I feel the difference in steering accuracy with them is minimal. You get more movement from the servo mounts than the gromets.

There is next to no vibration on electric cars, & hence they are not needed there.

I've tried to use the brass sleeves too, but they won't fit.
Joe

[Xlerator]

so it's ok to run without the brass bushings??? Someone said that i should run with the bushings...

[AudiTT-Quattro]

Originally posted by Railman
There is next to no vibration on electric cars, & hence they are not needed there.

There are ALWAYS vibrations -- they are just more noticeable in a nitro.

As for the brass bushings, I see no point in using them. The rubber is sufficient in absorbing the shocks.

[crank throw wei]

Like Railman,I run them on our nitros only.The electrics(if running an ESC) only use 1 servo,and that's for steering,where I like response to be as positive as possible.

[Railman]

AudiTT,
Are you saying you run grommets on electric too? If not why the comment? I didn't say there were no vibrations on electric, as that is obviously impossible. I said that there were next to none, which is pretty much the case. The vibrations on a nitro are probably 100 times that of an electric, which is more than just noticable. Nothing reciprocates on an electric. How would you compare them?:rolleyes:
Unlike nitro, I've never seen a servo failure from vibration on an electric car.
Joe

[rocknbil]

If you use gromments, the brass bushings are to keep the rubber from being crushed with tight screws.

[Railman]

Rocknbil,
Your right, it's just that a 4-40 screw won't fit through the brass sleeves, or at least none of the ones I tried. I suspect they are intended for airplane use with smaller screws.
Joe

[Xlerator]

Yes i also use 4-40 screws for all my servo/engine mounts and a few other aluminum parts. The brass bushings are to small for the 4-40 screws. I was thinking of looking for a small metal tube that i can cut to size and fit in the hole. SOmeone told me that there are brass sleeve that are larger, but i haven't seen any. The small bushings are for the small wood screws airplanes use.