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Thread: Stripped spur gear on first run

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Old 12-06-2018, 04:31 PM   #1
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Default Stripped spur gear on first run

I just finished an axial bomber kit and I stripped the spur within the first 5 minutes. Seemed to be running fine right up until it let go. I'm only running a axial 35t brushless and a 2s 5000mah Lipo so I don't think I overpowered it. I set the mesh using the construction paper method. Anyone got any advice?

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Old 12-06-2018, 05:02 PM   #2
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Default Re: Stripped spur gear on first run

I think the construction paper is a lil to thick. Try using regular lined paper. I rock the spur back n forth a lil n feel for a tiny tiny bit of 'slap' or 'tick' between the 2 gears. But wen i first started, i used lined paper n it worked perfect

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Old 12-06-2018, 05:22 PM   #3
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Default Re: Stripped spur gear on first run

I set them by feel - snugged up 'till you can just feel a little play in the gear mesh. If they're too tight they're noisy. Too loose and it strips the teeth off. Locktight your setscrew on the pinion - just a dab.
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Old 12-06-2018, 05:37 PM   #4
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Default Re: Stripped spur gear on first run

I agree with indybama. I’ve always just used standard notebook paper when I use this method.
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Old 12-06-2018, 06:02 PM   #5
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Default Re: Stripped spur gear on first run

What was the temperature? Plastic gets brittle when its freezing out, just a though.

Could the motor have come loose maybe?
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Old 12-06-2018, 10:26 PM   #6
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Default Re: Stripped spur gear on first run

does the top transmission input shaft have play? (in or out?) does the slipper not sit flush? (spin transmission output, see if spur wobbles)
your motor have play? (in-out) (this also causes loss of performance on brushes)
32p? 48p?

the paper method should work, normal notebook paper, or the little tic-toc rule. I have had many troubles with 32p on one axial, but all the others were perfect. on my troubled axial i went to 48p gears after a bunch of spur gears, and have never had any more problems.
i can say that the input shaft bearings have also given me issues. i replaced them with abec5 types. little costly, but never another reason for bearing runout or damaged spur. Pinions can be troublesome too, can always try another pinion?
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Old 12-06-2018, 10:36 PM   #7
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Default Re: Stripped spur gear on first run

see pic for spur wobble. easy fix, but takes a bit to find.
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