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My New Build
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redshift
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My New Build - 07.30.2010, 09:58 PM

Maxx Mutation, meet your replacement.

This one was started the end of 2009, and was originally going to be a twin inline outrunner chassis. I ended up deciding against that for numerous reasons. Simplicity was still a design priority however, so that meant it would not have a transmission. But being a pure basher, and not a racer, a center diff was not that appealing to me. I briefly considered a belt drive, specifically SDP-SI's new Conidrive series, but the available ratios would not have been easy to design around (driven pulley diameter and belt length). My next choice was Mod 1 gears, and the LST2's 63T spur fit the bill. Enough diameter to the keep the stress radius to a minimum. And keep it plastic hopefully, knowing I could switch to steel if needed. So my next move was drawing up the motor mount, which is a stressed member in this case. It is made of 1/2" aluminum, and I knew I wanted a centerdrive with an 8mm shaft. Having 1/2" to play with I went ahead and used two 8x16 bearings, where one would have been more than adequate.
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redshift
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07.30.2010, 10:04 PM

Next was the centershaft, no question this would be stainless, and I cut this out of a 5 or 6 pound chunk of 2.5" 304. If you were wondering, ten hours were spent on this part alone. I had made 8mm drive cups out of air-hardening for use with the outrunner (Mike was out of them at the time) so those are now being used on the centershaft.

Lots of photos to come... keep watching
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redshift
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07.31.2010, 04:25 PM

The motor mount was done knowing what I wanted to do for a chassis, obviously. :) And at that point I had a CC 1520 in mind. The idea of that motor hanging on two 3mm screws didn't sit well with me, so all four holes would be used. That's why the screw slots in the motor mount are so long.

I found where the pinion (RCM of course!) would sit on the shaft and made a ball divit with a diamond ball burr. I consider this a must to not have issues with the pinion. A tiny amount of red Loctite on the pinion setcrew, and it's trouble-free.
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redshift
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07.31.2010, 04:32 PM

On to the chassis...

Square tube is the simplest and strongest backbone, and after finding my dimensions I welded some chunks of aluminum onto the tubes. Four on each end, that would have gaps subsequently milled out, then end-drilled. The welds were then rough-cleaned-up using both inner and outer radius mills, and the setscrew pin retainers drilled and tapped. Next up was the joiner plate holes, the joiner plates themselves, and the provisions for the motor mount and aft bearing block were then done. As you'll imagine, this was a ton of work... and I still have finish work, mostly on the A-arm pivots.
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redshift
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07.31.2010, 04:36 PM

More...
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redshift
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07.31.2010, 04:41 PM

The main tube is 1.75" outside, 1.5" inside, 1/8" wall. Joiner plates are 1/8" thick as well.
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redshift
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07.31.2010, 04:48 PM

Coming together now
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redshift
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07.31.2010, 04:54 PM

I then made 'cartridges' for the diffs, these were milled out of plastic. The square end blocks with the hole for the diff input stays intact and serves as a stop for the two side pieces when installing the diff. I am using 10-32 blind nuts in the side pieces, because the end chassis holes will also be bumper mounts. Those will take far more torque than the 1/8" aluminum tapped out, and are replaceable. Bumpers have yet to be made, too many ideas and I can't settle on one, kinda frustrating!
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redshift
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07.31.2010, 05:04 PM

Then I had to come up with some half-ass battery holders. These will likely be changed, still a ways to go on finishing this one up. More to come!
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07.31.2010, 05:10 PM

....
   
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Bondonutz
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07.31.2010, 05:34 PM

Very Impressive work so far Bro, Looking great !


I retired from RC, now life is all about guns and long range shooting.
   
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magman
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07.31.2010, 06:57 PM

Holy shiz that is nice work. Curious to see what your ride weighs when done


1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S
   
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redshift
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08.31.2010, 07:37 PM

Did the video suck that bad?

{{{{ecccchhhhhhoooo}}}}

Quote:
Originally Posted by magman View Post
Curious to see what your ride weighs when done
Finally got it today, RTR 12.2 pounds!

With both servos it will still be under 12.5, the 1520 is laughing.
   
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magman
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08.31.2010, 07:45 PM

Quote:
Originally Posted by redshift View Post
Did the video suck that bad?

{{{{ecccchhhhhhoooo}}}}



Finally got it today, RTR 12.2 pounds!

With both servos it will still be under 12.5, the 1520 is laughing.
Nice...the 1520 is really nice in my mbx5t sooooo much tourque


1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S
   
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redshift
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08.31.2010, 07:52 PM

Quote:
Originally Posted by magman View Post
Nice...the 1520 is really nice in my mbx5t sooooo much tourque
What's yours weigh Brian?

I was guessing around 13 with mine, so I was very surprised to see less. So I'm allowing myself 13 with body piece(s) included, then I'll set about removing bulk to get it back down to 12.5 or less, completed.
   
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