Servo mounting procedures: tips
04-08-2006 | 08:25 AM
#1
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From: Germantown,
TN
Servo mounting procedures: tips
Newbie to sport. Have a Sig Four Star 60 with dual ailerons. I have just bought Futaba S 3010 high torque servos.
1. Concerning mounting servos: I've read you should drill 1/16 holes, put in the metal grommets, then insert screws. What purpose do the little metal grommets serve? Can you do without them?
2. I was also told a good technique is to screw in the screws a couple of times, then put a drop of fast CA glue in the threads which will help the screws stay seated? Is this a good technique?
3. Any other little hints/techniques on mounting servos would be appreciated.
1. Concerning mounting servos: I've read you should drill 1/16 holes, put in the metal grommets, then insert screws. What purpose do the little metal grommets serve? Can you do without them?
2. I was also told a good technique is to screw in the screws a couple of times, then put a drop of fast CA glue in the threads which will help the screws stay seated? Is this a good technique?
3. Any other little hints/techniques on mounting servos would be appreciated.
04-08-2006 | 09:25 AM
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From: Ratchaburi, THAILAND
RE: Servo mounting procedures: tips
Hi Jigeye,
The following lines were copied from Futaba's FAQ. I believe it helps a lot.
Proper Servo Mounting:
The proper way to mount a servo is as follows:
1. Insert a rubber grommet into each of the four servo holes.
2. Insert a metal eyelet from the bottom side of the rubber grommet. This way the wide portion of the eyelet will be in contact with the servo tray when mounted.
3. Test fit the servo in the tray, and enlarge the openings so the servo will not touch the tray. The rubber grommets will isolate the servo from the hard vibration of the airplane's structure.
4. Position the servo, then mark the location of the mounting holes. Drill pilot holes with a 1/16" bit at each mark.
5. Use the servo screws supplied with your radio to mount the servo(s) in the servo tray. Tighten the screws until they just touch the top of the metal eyelet.
The following lines were copied from Futaba's FAQ. I believe it helps a lot.
Proper Servo Mounting:
The proper way to mount a servo is as follows:
1. Insert a rubber grommet into each of the four servo holes.
2. Insert a metal eyelet from the bottom side of the rubber grommet. This way the wide portion of the eyelet will be in contact with the servo tray when mounted.
3. Test fit the servo in the tray, and enlarge the openings so the servo will not touch the tray. The rubber grommets will isolate the servo from the hard vibration of the airplane's structure.
4. Position the servo, then mark the location of the mounting holes. Drill pilot holes with a 1/16" bit at each mark.
5. Use the servo screws supplied with your radio to mount the servo(s) in the servo tray. Tighten the screws until they just touch the top of the metal eyelet.
04-08-2006 | 09:53 AM
#3
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RE: Servo mounting procedures: tips
ORIGINAL: jigeye
Newbie to sport. Have a Sig Four Star 60 with dual ailerons. I have just bought Futaba S 3010 high torque servos.
1. Concerning mounting servos: I've read you should drill 1/16 holes, put in the metal grommets, then insert screws. What purpose do the little metal grommets serve? Can you do without them?
>The metal grommets prevent you from overtightening the screws and
>thus preventing the rubber from isolating the servo from vibration.
>
>The 1/16" pilot hole is to prevent the screw from splitting the wood,
>This is especiall helpful when using 1/4" square basswood for servo
>rails.
2. I was also told a good technique is to screw in the screws a couple of times, then put a drop of fast CA glue in the threads which will help the screws stay seated? Is this a good technique?
>After screwing the servo screw in, remove it and put a drop of
>thin ca in the hole. After it dries, reinsert the screw. The ca
>hardens the threads in the screw hole and makes it less likely
>the screw will strip or pull out.
3. Any other little hints/techniques on mounting servos would be appreciated.
>I use the socket head servo screw from RTL Fasteners. I find them
>easier to install and because of the socket head the slots don't strip
>if the screw gets "stubborn".
Newbie to sport. Have a Sig Four Star 60 with dual ailerons. I have just bought Futaba S 3010 high torque servos.
1. Concerning mounting servos: I've read you should drill 1/16 holes, put in the metal grommets, then insert screws. What purpose do the little metal grommets serve? Can you do without them?
>The metal grommets prevent you from overtightening the screws and
>thus preventing the rubber from isolating the servo from vibration.
>
>The 1/16" pilot hole is to prevent the screw from splitting the wood,
>This is especiall helpful when using 1/4" square basswood for servo
>rails.
2. I was also told a good technique is to screw in the screws a couple of times, then put a drop of fast CA glue in the threads which will help the screws stay seated? Is this a good technique?
>After screwing the servo screw in, remove it and put a drop of
>thin ca in the hole. After it dries, reinsert the screw. The ca
>hardens the threads in the screw hole and makes it less likely
>the screw will strip or pull out.
3. Any other little hints/techniques on mounting servos would be appreciated.
>I use the socket head servo screw from RTL Fasteners. I find them
>easier to install and because of the socket head the slots don't strip
>if the screw gets "stubborn".
04-08-2006 | 09:19 PM
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From: East Cobb County,
GA
RE: Servo mounting procedures: tips
ORIGINAL: jigeye
1. Concerning mounting servos: I've read you should drill 1/16 holes, put in the metal grommets, then insert screws. What purpose do the little metal grommets serve? Can you do without them?
1. Concerning mounting servos: I've read you should drill 1/16 holes, put in the metal grommets, then insert screws. What purpose do the little metal grommets serve? Can you do without them?
The rubber grommets are vibration isolators. Properly installed they should have a specific amount of compression - no compression means the servo is loose, excess compression means that the grommet is no longer resilient and will transmitt vibration from the mount to the servo.
The function of the brass sleeve is to set the amount of grommet compression. With the flange (wide) part bearing against the servo mount, when the screw is run in and bottomed on the tube end of the sleeve, the sleeve prevents the screw pulling down on the grommet any further and thus sets the amount of grommet compression.
If installed upside-down, i.e. with the tube end of the sleeve against the servo mount (wood, ususally) and the flange on top of the grommet, the mechanical advantage of the screw threads will allow the screw to shove the tube end of the sleeve into the servo mount, effectively shortening the sleeve length and allowing the grommet to be overcompressed by the screw.
[engineering lecture mode off]
