Comparison of gearbox sound before and after gear set installation

[MaciekA]

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]

That is a dramatic change!

[Skladfin]

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

[Amos]

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

[MaciekA]

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]

Originally Posted by Amos

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

I can believe it