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RcBros Berg Build

I don't have any plans to do so at the moment, but am always open to ideas. Right now just trying to get my personal rig dialed.

I've been playing with motor and pinion placements. With the integy cans I can just barely squeeze a 13T pinion on. However with an epic can I can easily fit the 13T no problems. So looks like I may be motor hunting finally as well. There may be a second attempt at machining both the axle and motor mount areas. We shall see.
 
Well I've been doing alot of spending this week and my wallet hates me..

I purchased to Holmes Epic 45T handwound motors, a good year supply of stainless hardware and a year supply of Boca Ceramic Ball bearings.

I've got the front almost done, I just need to make the drag link. And I've got delrin on order for new links. I'm having a difficult time deciding which is lighter for links. Delrin, Aluminum, Stainless or Titanium..

My scale is not the best for weight under 5 grams. According to my scale, the 5/16" delrin and axial aluminum links are nearly the same weight.

I've switch out the front losi shocks for some of the 100M shocks I sell and added my own twist to them. It also saves me another 10grams.
 
Well no much progress but my goodies are arriving.

New motors from Holmes Hobbies, all new stainless hardware, replacement bearings from Boca Bearings and a new hitec servo. I got the servo simply because its slightly smaller then my airtronics.

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does your distributor have an online store?? i would like to get me a big bulk harware set like that! :mrgreen:
 
Well, I decided to get crazy last night on weight savings. Go big or go home right?
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I ended up milling the axles down to what some may call extreme measures. But I myself think they will hold up just fine under normal crawling circumstances. Granted, if it see's a cliff, there probably is no hope, but I can't see an axial or losi axle being any stronger.

With the help of my machinist we milled each side down so the axle tube thickness was right about 2.5mm... Then to save time I whipped out the dremmel and some sand paper and quickly put in some 45* corners on it. We really didn't do any hardcore measuring we just started cutting and stopped when it looked ok...

Managed to get it down to 25 grams.

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My machinist then looked at the stock berg locker and said, well lets make that out of 6061 and see what happens. So alittle while later we turned this...

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Into something that wouldn't even register on my scale lol. Looks like I need to get a small one for very lightweight parts. Under 5grams this thing sucks.

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The tolerances are tight, so there is no wiggle room. But I can't guarantee it will hold. If anyone can break it, I can. So we'll see how long it lasts.

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On a side note, the machinist and I were comparing axles gears last night. He has a newer shipped set and everything is different. The gears are a metal finish, no longer black, and the locker isn't cut nearly as deep as mine is above the driveshafts to fit.

His driveshafts also do not have the center pins like mine. Anyone know if theres a strength difference?

We will be milling my gears down next. A engineering friend is looking into the stronger and lightest way to mill the gears down. So it should be interesting.
 
Very nice build if the gears and lockers work out are you going to sell them or is this a one off build
 
Yes, if the lockers prove to work and last, they will be offered for sale. I'm not opposed to trying strong alloys either, we just need to get some time on them now.

As for the gears, we plan to save the files once completed and may offer that up as a service. However right now i'm just working on getting my personal rig back up and moving so I can start crawling again.
 
Well I picked up a new tool today. The old one was nice, but there was only 1 tip selection to choose from, and it was round.. I got it for a killer deal so I purchased it.

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Then I decided to begin saving some more weight and clean things up while I was at it.

First thing to do was ditch the old wiring and replace with smaller lighter 16G wire and clean up everything else.

I started with this at 110 grams.

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If you haven't picked one of these up from our store, you should, its a finger and life saver!

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And another tip for those of you soldering. I see so many people solder there speed control to the deans plug, and then solder there BEC on. It creates a huge bulk mess on the solder joint and looks just as bad.. Do your safe a favor and strip just alittle bit more off your speed control wire and bec wire. Then twist the two together. Slightly dip in some flux, then fill your iron with solder and apply. Walla, one joint!

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When I was done cleaning everything up, I saved 25grams, not bad!

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I may even get alittle more picky and cut and re-crimp ends to be the exact length for my rx. But then I'd be screwed if I wanted to change my setup, so we'll see. In the meantime, I neatly folded the excess and secured with heatshrink.

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Then to save some more weight and add some more room, I took my micro rx out of my on-road car and will use it on the berg.

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I started on the new links, but ran out of rod ends, so I'm at a stop until I pick up some more..

5/16" Delrin with 8-32 Stainless set screws.

I kept the front similar to what I was already running, except I bent them out just a tad to keep from hitting the case like my straight links seemed to do.

I also made a set of bent links to match the rear.

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Just got done making my steering link. 6061 1/4" Aluminum rod. Simply bent up on the vise and drilled and tapped using a harbor freight special drill press. Taped with 8/32 stainless set screws.

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well i guess i have 4 bergs and i have over 8 ton of rock in my basement i crawl almost every day and every weekend can send some vids of my home course if you think thats necassary
 
Hey Guys,
Thanks for all your pm's. I will answer all pm's tomorrow once I pick everything up.. I got some cool gears and my cut wheels to post up tomorrow too!
 
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