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Please help me with spur gear keep stripping ...

Please help me with spur gear keep stripping ...

Old 11-28-2011, 01:01 AM
  #1  
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Default Please help me with spur gear keep stripping ...

Hi All,

I have an Mini Inferno EP buggy, and change to burshless recently. The spur gear keep stripping and I have replace 2 set of new spur gear ... Here is some info:

1. Motor, HobbyWing 5400KV brushless
2. ESC, HobbyWing XERUN 18A, with punch control set to 7 (the 3rd highest setting)
3. Lipo with 40C output
4. Pinion gear is 14T (metal)
5. Spur gear is 32T (plastic)
6. Slipper almost lock completely
7. All center, F/R diff are stock, gear diff
8. Motor mount screw are all loctited (blue)

I have rebuild the whole motor mount 2 times, and set the gear mesh correctly (paper method)

The thing is during first 5 mins run time, the car is perfect, then it start prodcue gear stripping sound when accelerate. I hv check all gear diff are ok, just the spur gear has been stripped.

Questions:
-- Beside still having gear mesh problem, is it possible I have over-gear it too much? or having too aggressive punch setting in the ESC?
-- For spur gear to be stripped, it is because of gear mesh too tight, or too loose?
-- Do I need to apply some lub, or gease between ponion and spur gear?

Thanks for any help
koonyue is offline  
Old 11-28-2011, 01:08 AM
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Use very thin paper, and crush the crap out of it.
It should come of like this : ZZZZZZZZZZZZZZZZ
Piece of plastic bag would work too.

Too tight, will make high pitch noise.

Too loose, will strip quickly

Exposed gears, no grease.....will attract dirt. Could use graphite dust (dry lube), but that's not your problem.

Assuming, you have the correct gear match (pitch of gear)

Loosen slipper will help too.....(cushion the drive line)
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Old 11-28-2011, 01:53 AM
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what?! Just a thin paper or even plastic bag ? I used to double fold A4 office paper for setting gear mesh ... I think it is WAY too loose ...

btw, assume I hv good mesh, how about ESC punch control? If it is too aggressive, will it hurt gear life as well?

Thanks, let me try tonight !
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Old 11-28-2011, 06:38 AM
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Originally Posted by koonyue
6. Slipper almost lock completely
Well there's your first problem.
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Old 11-28-2011, 08:40 AM
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Guys,

"Assuming, you have the correct gear match (pitch of gear)"

In fact I don't know what pitch are my pinion gear, here is the link
http://teamassociated.com/parts/details/21153/

and the spur gear:
http://www.modelsport.co.uk/kyosho-d...roducts/366397

After I use this Associated pinion, the car is EXTREMELY noisy and loud, I think something must goes wrong ...

I will try loose up the slipper and try again, thanks !
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