Comparison of gearbox sound before and after gear set installation

MaciekA · September 23rd, 2011, 15:33

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).

Basic-Wedge · September 24th, 2011, 15:39

That is a dramatic change!

Skladfin · September 24th, 2011, 15:42

I don't know... they don't sound that different to me.. plus the second video has a suppressor.

Amos · September 24th, 2011, 15:44

Believe it or not, properly shimmed gears make a big difference.

MaciekA · September 24th, 2011, 16:19

Quote:

Originally Posted by Skladfin

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

MaciekA · September 24th, 2011, 16:21

Quote:

Originally Posted by Amos

Believe it or not, properly shimmed gears make a big difference.

I can believe it

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September 23rd, 2011, 15:33	#1
MaciekA Trader rating Join Date: Jun 2011 Location: Portland, Oregon, USA	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).

September 24th, 2011, 15:39	#2
Basic-Wedge Trader rating Join Date: Mar 2010	That is a dramatic change! __________________ * * * * * * * * * Rob Bye

September 24th, 2011, 15:44	#4
Amos Trader rating Join Date: Aug 2006 Location: Japan	Believe it or not, properly shimmed gears make a big difference. __________________ Custom Builds: FA3674U Krinkov G3SD6

September 24th, 2011, 15:42	#3
Skladfin Trader rating Join Date: Dec 2006 Location: Glace Bay, Nova Scotia	I don't know... they don't sound that different to me.. plus the second video has a suppressor.

Comparison of gearbox sound before and after gear set installation

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