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Old Dec 03, 2003, 03:31 PM
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Chandler, AZ
Joined Mar 2002
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How to build a GWS Gear Box

Here is a picture tutorial of how to assemble your own GWS Gear Box. Total Cost: 12.20 plus shipping. I picked up everything from www.parkflyermotors.com

Moderators: Please move if this is the wrong forum.


Firstly, Assemble your parts together:

2 GWS Bearings
1 EPS Frame
1 Spur Gear
1 Prop Shaft
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Old Dec 03, 2003, 03:32 PM
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Chandler, AZ
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Open everything being careful not to lose any small pieces (I almost lost a washer) and put the bearings inside the GWS EPS Frame. They should be snug.
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Old Dec 03, 2003, 03:34 PM
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Next, I like to put the Spur Gear on the shaft. This lets you get it on really good without putting any strain on the gear box frame. I push the end of the shaft against the edge of the table and push on the gear. The final result is a nice, tight fit.
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Old Dec 03, 2003, 03:38 PM
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Next, I put the shaft inside the frame. NOTE: Make sure to slide it in from the FRONT OF THE FRAME. So the spur gear should be moving towards the frame. It seems simple, but this alluded me for sometime. I was removing bearings and such.

Put the washer included with the prop shaft on the end of the shaft.

After that's done, it's time to install the dreaded "E-Clip" I have a good method. Get a pair of needle nose pliers and put it in the very end. Press it in just enough so it stays without you having to hold it.
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Last edited by enigmabomb; Dec 03, 2003 at 03:41 PM.
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Old Dec 03, 2003, 03:42 PM
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Chandler, AZ
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Once the clip is on there so it doesn't want to fall off, Put the pliers sideways, and finish squeezing the clip on. See the attached picture. It should make a 'click'
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Old Dec 03, 2003, 03:43 PM
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Admire your hard and precise work. It should spin freely. You should feel good, this was not an easy process.
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Old Dec 03, 2003, 03:49 PM
Hacker motoren rules :)
Philip Thulin's Avatar
Sweden, Östergötland County, Norrköping
Joined Sep 2001
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why not buy the whole gearbox complete with motor and spinner redy to use for $17 instead?

/Philip
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Old Dec 03, 2003, 03:52 PM
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Chandler, AZ
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That 5 dollars is like 4 prop shafts or 3 propellers. I could spend the money, but with a little ingenuity I can save 5 bucks. Every little bit counts when you're a student.
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Old Dec 03, 2003, 03:58 PM
KSU Flyer's Avatar
Manhattan, Kansas, United States
Joined Nov 2001
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FYI

You can buy an EPS100 motor with gearbox w/ ballbearings from Balsa Products for $12.00...

http://www.balsapr.com/catalog/motors/EPS100C.asp

-Mike
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Old Dec 03, 2003, 03:59 PM
I told them, I was drunk.
temp_oct's Avatar
Bangkok, Thailand
Joined Aug 2003
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I think you can buy assembled EPS350 gearbox (with spinner) from aircraft-world.com for $11.80 + $2.50 S&H. It is cheaper than built the whole thing from all the parts (well, compared to my LHS anyway )
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Old Dec 03, 2003, 04:03 PM
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New Jersey (excl EWR), United States
Joined Apr 2002
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Well, This is good to know, if you bend your prop shaft. Not that I do

Jon
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Old Dec 03, 2003, 04:57 PM
Registered User
Walled Lake, MI, USA
Joined Feb 2000
11,182 Posts
The EPS-100 gearbox is just a fraction of an inch smaller in diameter than the EPS-300/350 gearbox, and, as Mike says, can be bought with 280 motor for $12. I now have quite a collection of 280 motors since I've been buying these to convert to Johnson 250 use.
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Old Dec 05, 2003, 12:44 PM
Hacker motoren rules :)
Philip Thulin's Avatar
Sweden, Östergötland County, Norrköping
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I´m a student...
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