05-29-2015, 02:48 PM | #1 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| jebster's mini super
I have to thank MRCrackHead and Dlux for implanting the bug to build one of these myself. My wallet is not happy! (And like others I'm not sure which board to post in so this will do for now.) That being said I am looking to do this on a budget. I will probably never comp with it but I thought it would be a good fun rig to bring along to run 2.2p courses between runs. Following MRCrackHead's lead I decided to go with madtorque axles. I got the berg gear and RCBros locker combined with the plastic gears. I cut down the axle tubes to the desired length then needed to figure out how to turn them down for vanquish c-hubs. I don't have a lathe but I do have a drillpress. So, I put a aluminum tube of the perfect diameter through the axle tubes and spun them on the drill press and used different files to get them to the correct diameter. I used a nylon block at in the vice to hold the bottom of the tube straight. It all worked out really nice. I left them a little big because I plan on press fitting the c-hubs on to cut some splines. The one real problem I have is the gearbox is binding. It appears the 14t small gear is binding against the 40t gear. Not sure why this is an issue. I've tried a few adjustments but it isn't working. My next option is to get a 12t gear, cut the shaft down to the right length and use that instead. From the last picture below it looks like this would still provide plenty of gear engagement. I have some pics of the progress so far. This may take awhile but I couldn't wait to get started. |
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05-30-2015, 07:09 AM | #2 |
Wanna get? Gotta want. Join Date: Apr 2010 Location: SLC, UT
Posts: 7,052
| Re: jebster's mini super
Great to see you doing a build! This class has a faster growth rate than any other class right now! LOL. I hope this does not come accross the wrong way as it is one of my growing pet peeves so, if it does, please forgive me. When it comes to gear issues, there are gear issues and then there are gear issues. Let me explain... Seems like most in the hobby want to get their cars and have everything turn super smooth from the start. All the way back to my Losi Comp Crawler days, I have tried to explain to people that you do not want your gears to turn smooth from the start! A bit of resistance maybe even some chunkiness is what you want. A great set of gears will marry to each other and have perfect mesh after running for sometime. If its smooth at the beginning before even running, that means that mesh is pretty sloppy (weak engagement). So, the above is if mesh is tight. The other problems you can run into is if gears are rubbing things they shouldnt be, like screws or bearings etc,. That obviously needs fixing. I dont know what your gear issue is, but if its just tight, run it. I have no idea how many cars I have built at this point but almost all of them need to have the gears broken in, again, this is a great thing. Just keep an eye on your motor temps and usually they will break in within 1 pack. If you go through 2packs and they dont spin smooth after that, its still a good thing because now you can usually take the gears out and inspect them for odd wear and see where the problem is. Looking forward to more. |
05-30-2015, 07:11 AM | #3 |
RCC Addict Join Date: May 2013 Location: York, PA
Posts: 1,028
| Re: jebster's mini super
I'm not sure what to tell you, my gears seem fine; they're kinda noisy but no binding issues. Maybe it's the case, not the gear. Do all the gears work fine in the other case? Metal gears vs. plastic? Are the cases matched "halves" and you got the left and right of the front and back mixed up? Just grasping at ideas, sorry. Last edited by MRCrackhead; 05-30-2015 at 07:14 AM. |
05-30-2015, 07:15 AM | #4 |
RCC Addict Join Date: May 2013 Location: York, PA
Posts: 1,028
| Re: jebster's mini super
Brilliant work on the axle tubes, by the way. Great start. |
05-30-2015, 02:52 PM | #5 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super
Erik, I understand the point you are making on gear mesh. A little tight with some tension isn't typically a problem as it will break in. I don't think that is what I have going on. This may not be the ideal test but once fully assembled I slid a screwdriver blade into the locker and tried turning it. I was having to put enough pressure on it to turn I seriously thought I would break something. Starting at the locker I did the same thing with each gear individually and it seems to originate with the 14t to 40t gear mesh. That is why I was looking to see if others had this issue. I guess I should run the motor on it to see if it is that bad from the other end of the tranny. I am running plastic 40 and 42t gears with the metal berg gear. MRCrackHead, sounds ad if this is something with my parts if you aren't seeing the same problem. I'll check the cases again just in case. |
05-30-2015, 04:07 PM | #6 |
RCC Addict Join Date: May 2013 Location: York, PA
Posts: 1,028
| Re: jebster's mini super
It may be very difficult to turn from the locker. You're at the wrong end of the mechanical advantage the gears are producing, just keep that in mind. It may be very easy to turn from the motor end, relatively speaking, of course. I'm bummed you're having trouble. My steel gears worked fine and swapping plastic in didn't affect anything except weight. |
05-30-2015, 08:16 PM | #7 | |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super Quote:
I'm not too worried either way. Just part if the build process. | |
06-01-2015, 07:07 AM | #8 |
Wanna get? Gotta want. Join Date: Apr 2010 Location: SLC, UT
Posts: 7,052
| Re: jebster's mini super
You have two sets of gear boxes, right? Do both do the same thing?
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06-03-2015, 01:45 PM | #9 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super |
06-12-2015, 12:47 PM | #10 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super
got some more work done. bought some cheap (GCM I believe) c-hubs and press fit them on the axle tubes. worked out fine. I made a servo mounting plates (still need to drill some holes to lighten it up) and also made up some link/shock mounts that slide right on the axle tubes snug. everything seems to be fitting together pretty well. I am keeping mine axles narrow and will widen it out with hubs on the wheels if necessary. it is moving along slowly but there is progress. Last edited by jebster; 06-12-2015 at 01:29 PM. |
06-12-2015, 01:15 PM | #11 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: jebster's mini super
Could you possibly cram more onto those little axles! Wow thats a compact package of stuff!
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06-12-2015, 01:17 PM | #12 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: jebster's mini super |
06-12-2015, 01:32 PM | #13 | ||
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super Quote:
Quote:
this rig is an experiment for me. I definitely want to run it on 2.2p courses so keeping it narrow is the plan. | ||
06-13-2015, 12:16 PM | #14 |
Rock Crawler Join Date: Aug 2013 Location: Norway. Bodø city
Posts: 877
| Re: jebster's mini super
what kinda pinions are you using??
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06-13-2015, 12:17 PM | #15 |
Rock Crawler Join Date: Aug 2013 Location: Norway. Bodø city
Posts: 877
| Re: jebster's mini super
PS,, I love this consept.. Anything is legal,, I am waiting to see the first MOW crawler in this section...
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06-14-2015, 03:13 PM | #16 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super |
06-14-2015, 03:17 PM | #17 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super
Looking for some advice from people with supers out there. What do people do for clocking the chubs on the rear axle? After some searching (with limited results) it seems like most people don't clock the chubs on the rear axle. In most cases they did that because they had no idea of what else to set them to. Thoughts? |
06-14-2015, 07:38 PM | #18 |
owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
| Re: jebster's mini super
depends on how you want it to react. Flat is good all around. Pins tilted to the front gives better steering during climbing, pins tilted to the rear gives better steering during decent.
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06-15-2015, 01:46 PM | #19 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super Thanks for the info. Given this is my first 4ws comp style rig I think flat sounds like the right option for me.
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06-27-2015, 07:34 AM | #20 |
I wanna be Dave Join Date: May 2010 Location: The east coast
Posts: 2,599
| Re: jebster's mini super
some additional progress. made some upper link mounts. also started mocking up links. using my normal nylon cutter board material I made up a quick skid and side plates to determine a few things. the links are things I had laying around but they might be good enough to keep. as shown it is about a 13.5" wheelbase. I've been toying with the idea of a narrow track width and long wheelbase. until it is all running i'm not sure what is going to work best. still collecting more parts but I am still working it. |
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