Futaba MG digital servo-gear slop???
09-16-2012, 06:16 PM
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Futaba MG digital servo-gear slop???
I have four futaba 9155 MG servos that have started to show some slop. Someone has told me that the worn gear on these is usually the nylon 1st gear. I've never had any 9156 servos, but I'm told that the gear train is the same in both. Has anyone had experience with either of these servos and was the nylon"1st gear" actually the problem?
Thanks
Thanks
09-16-2012, 08:44 PM
#3
Senior Member
RE: Futaba MG digital servo-gear slop???
ORIGINAL: flyerdave I have four futaba 9155 MG servos that have started to show some slop.
Someone has told me that the worn gear on these is usually the nylon 1st gear. I've never had any 9156 servos,
but I'm told that the gear train is the same in both. Has anyone had experience with either of these servos and
was the nylon"1st gear" actually the problem? Thanks
Someone has told me that the worn gear on these is usually the nylon 1st gear. I've never had any 9156 servos,
but I'm told that the gear train is the same in both. Has anyone had experience with either of these servos and
was the nylon"1st gear" actually the problem? Thanks
(unless of courseowner is in the habit of working servo horn by hand and damaging the servo,)
. Servo - Do not turn by hand
. Servo - FAQ : Metal Gear Servos - Why MG Servo have a Plastic Primary 1st Gear
. Servo - FAQ : Metal Gear Servos - DIY Repair & Extend MG Servo Gear Life<dt>(shows examples of what causes slop beside wear of servo teeth
.Servo - Burnout. Cause & Prevention
and more below
"Radio Systems, Accessories, Alterations and FAQ" at
Alan's Hobby, Model & RC FAQ Web Links
Alan T.</dt>
09-17-2012, 02:53 AM
#4
Senior Member
RE: Futaba MG digital servo-gear slop???
All metal geared servos develope slop much faster than the nylon geared ones do. That is the one big disadvantage of metal geared servos.
09-17-2012, 03:49 AM
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RE: Futaba MG digital servo-gear slop???
Thanks for the help. One of the links suggest turning one of the gears 180 degrees to use "new" teeth and lube with servo grease. I love saving money as much as the next guy and I can try this but I want to know if this technique is safe. These servos are on the ailerons of an aeroworks 100cc extra 300 and I don't want to take chances with a $2500.00 plane.
Thanks
Thanks
09-17-2012, 05:37 AM
#6
RE: Futaba MG digital servo-gear slop???
Those big engines will wreck any servos
One thing which helps - is to balance the ailerons such that they feed back less energy to the gears .
One thing which helps - is to balance the ailerons such that they feed back less energy to the gears .
09-17-2012, 12:39 PM
#7
Senior Member
RE: Futaba MG digital servo-gear slop???
ORIGINAL: flyerdave Thanks for the help. One of the links suggest turning one of the gears 180 degrees to use "new" teeth and lube with servo grease. I love saving money as much as the next guy and I can try this but I want to know if this technique is safe. These servos are on the ailerons of an aeroworks 100cc extra 300 and I don't want to take chances with a $2500.00 plane.
Thanks
Thanks
"regularily" is the active word, this for a servo from new. If an already "dead"servo with slipping
or jamming gears on a large expensive model, will still work but later failure will be without warning and no doubt
other damage has occured to the posts and sockets in the case as was pictured in that post.
Have used the techniqure on many ancient servo on upto .60 size models and where gear sets are no
longer available for the servo. see also
.Servo - Burnout. Cause & Prevention
Alan T.
Alan's Hobby, Model & RC FAQ Web Links
09-17-2012, 03:35 PM
#9
RE: Futaba MG digital servo-gear slop???
ORIGINAL: A.T.
Technique, ''turn the middle gears regularily'', would not have been mentioned if it were not safe.
''regularily'' is the active word, this for a servo from new. If an already ''dead'' servo with slipping
or jamming gears on a large expensive model, will still work but later failure will be without warning and no doubt
other damage has occured to the posts and sockets in the case as was pictured in that post.
Have used the techniqure on many ancient servo on upto .60 size models and where gear sets are no
longer available for the servo. see also
. Servo - Burnout. Cause & Prevention
Alan T.
Alan's Hobby, Model & RC FAQ Web Links
ORIGINAL: flyerdave Thanks for the help. One of the links suggest turning one of the gears 180 degrees to use ''new'' teeth and lube with servo grease. I love saving money as much as the next guy and I can try this but I want to know if this technique is safe. These servos are on the ailerons of an aeroworks 100cc extra 300 and I don't want to take chances with a $2500.00 plane.
Thanks
Thanks
''regularily'' is the active word, this for a servo from new. If an already ''dead'' servo with slipping
or jamming gears on a large expensive model, will still work but later failure will be without warning and no doubt
other damage has occured to the posts and sockets in the case as was pictured in that post.
Have used the techniqure on many ancient servo on upto .60 size models and where gear sets are no
longer available for the servo. see also
. Servo - Burnout. Cause & Prevention
Alan T.
Alan's Hobby, Model & RC FAQ Web Links
Many cases will suffer from elongation of the gear pivots -this is VERY hard to detect in many cases - th gears tho good will not be in full engagement in many cases
When in doubt change cases and gears
09-17-2012, 03:40 PM
#10
Senior Member
RE: Futaba MG digital servo-gear slop???
ORIGINAL: karolh What is the best thing to use for servo grease. Karol
Servo - DIY Repair - Lubrication (servo grease)
Alan T.
Alan's Hobby, Model & RC FAQ Web Links
09-17-2012, 03:56 PM
#11
RE: Futaba MG digital servo-gear slop???
ORIGINAL: A.T.
As in the link on gear wear:
Servo - DIY Repair - Lubrication (servo grease)
Alan T.
http://<u><font color=''#00265e''>Al...nks</font></u>
ORIGINAL: karolh What is the best thing to use for servo grease. Karol
Servo - DIY Repair - Lubrication (servo grease)
Alan T.
http://<u><font color=''#00265e''>Al...nks</font></u>
Karol
