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Comparison of gearbox sound before and after gear set installation

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Old September 23rd, 2011, 15:33   #1
MaciekA
 
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Comparison of gearbox sound before and after gear set installation

Hey guys,

Over the last few weeks I've been using my PWS Diablo as a gearbox learning platform, replacing one part at a time, checking the results, taking it to games, trying to break it (i.e. seeing if my changes hold up to abuse), coming back afterwards and doing a post-mortem, tinkering more, wash, rinse, repeat. I'm trying to record video along the way to document my own learning and experimentation process.

In my last disassembly and reassembly, I replaced the stock G&G gears, 8mm metal bushings and shims with the Modify Smooth Modular gearset (torque) from airsoftparts. It was pretty easy to install. The gear set claims to be pre-shimmed with no play after installation, and after putting it in and installing the motor I confirmed that this seemed to be the case.

The stock shim job had a bit of play to it. From reading various threads here and elsewhere, I've noticed many people saying that imperfect shimming can lead to gear whine (ranging from minor to extreme). I was looking forward to verifying that myself, so I recorded a video before the install and after.

Here is the sound of the gearbox before the gearset installation:

Modified SCG PWS Diablo - YouTube

Here is the sound of the gearbox after the gearset installation:

Modified SCG PWS Diablo v2 - YouTube

As you can hear, the Modify pre-shimmed gearset indeed sounds a lot less whiny. I'll add that trigger response seems slightly improved, and in person the gun is a bit quieter now.

(Note: the first video is testing with 0.25g BBs and the second one with 0.20g BBs, the fps and RoF stayed roughly the same between both revisions of the build).
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Old September 24th, 2011, 15:39   #2
Basic-Wedge
 
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That is a dramatic change!
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Old September 24th, 2011, 15:42   #3
Skladfin
 
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I don't know... they don't sound that different to me.. plus the second video has a suppressor.
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Old September 24th, 2011, 15:44   #4
Amos
 
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Believe it or not, properly shimmed gears make a big difference.
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Old September 24th, 2011, 16:19   #5
MaciekA
 
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Quote:
Originally Posted by Skladfin View Post
I don't know... they don't sound that different to me.. plus the second video has a suppressor.
Identical aside from the gear set. That would be the Diablo compensator you're seeing
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Old September 24th, 2011, 16:21   #6
MaciekA
 
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Quote:
Originally Posted by Amos View Post
Believe it or not, properly shimmed gears make a big difference.
I can believe it
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