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04-30-2013, 07:08 PM | #81 | |
E.Y. Designs Join Date: Sep 2011 Location: Springfield, OR
Posts: 3,591
| Re: Chris's "Cow Ant" XR Crawler Build Quote:
Derlin Motor Sav'r - Extreme Motor Guard | |
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04-30-2013, 08:20 PM | #82 |
I wanna be Dave Join Date: Mar 2008 Location: In the Dark Edges of your Mind
Posts: 6,386
| Re: Chris's "Cow Ant" XR Crawler Build
It was good to meet you. I really like your build and the truck looks really great in person as well. I was shocked when I went to my first comp It had 4 courses and I don't think I made it past get 3 on any of them. They actually started a joke that stuck for a while... "Here's Harvo. You have to get the calander out to time him" |
04-30-2013, 08:32 PM | #83 | |
I wanna be Dave Join Date: Jan 2012 Location: williamsport
Posts: 8,649
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04-30-2013, 08:38 PM | #84 | |
I wanna be Dave Join Date: Jan 2012 Location: williamsport
Posts: 8,649
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04-30-2013, 08:49 PM | #85 |
E.Y. Designs Join Date: Sep 2011 Location: Springfield, OR
Posts: 3,591
| Re: Chris's "Cow Ant" XR Crawler Build Sorry totally forgot about yours Ok forgot about these sweet ones which are now becoming what people are starting to use http://www.rccrawler.com/forum/axles...ml#post4233309 |
05-04-2013, 01:08 PM | #86 |
Rock Stacker Join Date: Mar 2013 Location: Beaverton
Posts: 98
| Re: Chris's "Cow Ant" XR Crawler Build
What an awesome build thread. Great pics and descriptions.
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06-09-2013, 09:23 AM | #87 |
Rock Stacker Join Date: Sep 2010 Location: Mobile, AL
Posts: 80
| Re: Chris's "Cow Ant" XR Crawler Build
Well it's been a while since I've posted an update on this build. I've been selling alot of the old parts to buy a new radio, different electronics, shocks, hardware, etc. In the past month, my focus has been with weight reduction. At ECC, the total weight was 2469g (5.44 lbs). I'm trying to get that number down to 2000g or less. So I started with the wheels and tires. I drilled 12 1/4" holes (and slotted every other one) in each wheel, turned down the hubs a little bit, swapped to aluminum hardware, bead-blasted the beadlock rings, and trimmed the side lugs off the tires... Before: After: Weight savings: 42g per pair = 84g total for tires and wheels. I'm finishing up the new chassis design now (old chassis and links are going to be listed in F/S section soon btw ) as well as the suspension geometry to go with it using lighter shocks. I'll have that progress posted in the next few days or so. |
06-09-2013, 12:12 PM | #88 |
Quarry Creeper Join Date: Jan 2008 Location: Hellsberry
Posts: 293
| Re: Chris's "Cow Ant" XR Crawler Build
Great build! Look forward to see what you have up your sleeve for new chassis. With what you learned on this one, I bet the next generation is gonna rock!
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06-09-2013, 04:31 PM | #89 |
Rock Stacker Join Date: Feb 2012 Location: Sunshine Coast Australia
Posts: 70
| Re: Chris's "Cow Ant" XR Crawler Build
Hey mate, nice work again, i'm impressed you have the stamina to do another round with another chassis..Look forward to this build too. What was wrong with your old chassis? Is there a reason why you need those weight reductions? Cheers
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06-21-2013, 06:57 PM | #90 | ||
Rock Stacker Join Date: Sep 2010 Location: Mobile, AL
Posts: 80
| Re: Chris's "Cow Ant" XR Crawler Build Quote:
Quote:
The weight reductions are needed I think to give the truck an overall lower center of gravity and to help give it better control on the rocks. With this new build, I'll be shooting for less than 2000g. The new chassis differs from the old one in the following ways: -made from 5/16" wide 7075 alum strips instead of 3/8" -chassis pieces are all straight (i.e. zero bends for more rigity) -bead blast finish instead of black powder coat finish -utilizing all aluminum hardware instead of steel -lower profile: 3" tall instead of 3.5" -should be at least 25% lighter Here's what it looks like in CAD sitting next to the old one: and in SketchUp: The new chassis is alot easier to make since the pieces are straight. I actually have most of the pieces already made! For shocks, I decided to go with Traxxas big bores. I went with "long" (TRA2260) shock bodies and turned them down using Jaker's lathe. I removed around 0.055" off the diameter - this provided 7g of weight savings: I'm going to try to finish up the chassis tomorrow and post more pics. Stay tuned! | ||
06-21-2013, 08:34 PM | #91 |
RCC Addict Join Date: Jul 2006 Location: Pasadena
Posts: 1,118
| Re: Chris's "Cow Ant" XR Crawler Build
Are you trying to make a flatpack chassis? If so, IKEA might endorse you.
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06-22-2013, 04:07 PM | #92 |
Rock Stacker Join Date: Feb 2012 Location: Sunshine Coast Australia
Posts: 70
| Re: Chris's "Cow Ant" XR Crawler Build
Keep it up Chris, it will be interesting to see how the two chassis' compare...
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06-23-2013, 12:13 AM | #93 |
Rock Crawler Join Date: Aug 2011 Location: Perth west oz
Posts: 944
| Re: Chris's "Cow Ant" XR Crawler Build
Just read the whole thread.... Excellent design and well made.... If you are redoing the new design and they are all straight plate, why don't you do them with CF plate? It will give you a lot of weight saving over aluminum plate. |
07-04-2013, 02:08 PM | #94 | ||
Rock Stacker Join Date: Sep 2010 Location: Mobile, AL
Posts: 80
| Re: Chris's "Cow Ant" XR Crawler Build Quote:
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SO a few updates on the V2 build... I finished all of the chassis pieces and went ahead with bead blasting them, looks pretty cool: Overall weight so far is 102g, but that's without the skid plate and body panels. I'm aiming for around 130g total for the chassis. Previous design was 188g so there will be a good bit of weight savings there. | ||
11-17-2013, 07:55 AM | #95 |
Rock Stacker Join Date: Sep 2010 Location: Mobile, AL
Posts: 80
| Re: Chris's "Cow Ant" XR Crawler Build It's been a few months since my last post (feels so good to be done studying for the PE exam), but here are some updates on the v2 build: I turned down the stock tranny gears just to see what kind of weight savings could be made: Overall, saved about 13 grams per axle: Then I decided to turn down the VP rear lockouts to get within 1g of the stock plastic ones: Stock Plastic: Stock VP: Turned down: After noticing there was little wear on the underside of the transmission cases, I decided to return to using the stock plastic ones instead of the VP. This yielded some good weight savings as well: Stock VP (after bead blasting): Stock Plastic: Then, I lightened up the steering a bit by going with 1/8" titanium rods, aluminum hardware, and a carbon fiber steering arm. Before: After: All of these changes combined to reduce the front axle weight by 64 grams total: Before (400g + 28g steering): After: The rear axle weight was reduced by 51 grams total: Before: After: Well that's all for now. I'll be finishing up the shocks in the next couple of days (hopefully) and post the progress. After that, 4-links, electronics, and finishing touches on the chassis. Stay tuned. |
11-17-2013, 08:58 PM | #96 |
I wanna be Dave Join Date: Jan 2012 Location: williamsport
Posts: 8,649
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Lockouts look awesome turned down! Superior work in all that you did, gears look cool dished out as well! lots more grams to be lost if you stick with some CF.. tranny windows, servo guard, battery tray, etc.. |
12-22-2013, 09:16 AM | #97 |
Rock Stacker Join Date: Sep 2010 Location: Mobile, AL
Posts: 80
| Re: Chris's "Cow Ant" XR Crawler Build
I finished up the shocks and they came in pretty light for big bores... Before (84g): After (46g): Also, the new 4-links shaved some weight since the uppers are now 1/8" Ti-rod and aluminum balls are used throughout. Before (77g): After (61g): And finally, I added knuckle weights back to front axle. I'm gonna try not using the half-weights at first to see how that affects the distribution before adding more. Before (212g): After (121g): Time to start soldering some wires! |
12-22-2013, 11:14 AM | #98 |
Quarry Creeper Join Date: Jul 2009 Location: Woodburn, Oregon
Posts: 358
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Some how I have miss this build. I read though the whole build and what a great job you did. I love to see guys step outside the box and use their own design. It's like the good old day. Keep up with the great build thread, it was a lot of fun to read.
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12-23-2013, 01:07 AM | #99 |
Quarry Creeper Join Date: Jan 2007 Location: Italy
Posts: 297
| Re: Chris's "Cow Ant" XR Crawler Build
I'm reading this thread an year later it started and it is very interesting and original . I'm only at page 2 but I already have some questions. You tried and were successful in reducing the slope in the tranny. I think the major reason you did it is reliability and durability or are there other important considerations ? Besides you shimmed the front universal this way: According to my limited experience this can be a potential error. In fact the front universal and knuckle turning point must be aligned. I think you should shim either internally either externally when the knuckle is turned and the front universal is in the right position, not free to move any more. Bye Filippo |
03-01-2014, 08:28 AM | #100 | ||
Rock Stacker Join Date: Sep 2010 Location: Mobile, AL
Posts: 80
| Re: Chris's "Cow Ant" XR Crawler Build Quote:
Quote:
Since I upgraded to a 4 channel radio (Futaba 4PL), I decided to ditch the br-xl and punk dig and go with two CC micro sidewinders. Quite a bit of weight savings. Total weight of both micro sw's, castle bec, receiver, and all wiring: 55 grams. (old electronics and wiring came out to 121 grams) All wired up: As it sits now, I'm a good bit under 2kg. Still have to add the skid plate and body panels but weight's looking good so far... | ||
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