e's ExMT

[ekd]

Food for thought:

These gears are why I chose the MT. Stout and cheap.

Between the choices of ratios, given the choices in intermediate gears and motor pinions, there are many sweet spots waiting. We may have many choices in motors.

This cluster can approached from both sides, and can be mated along a wide arc of the primary spur. A little thought, and a very compact system is yours.

And, again...what do we lose by going back to wider wheels?

 

[Abavuso]

Food for thought:

These gears are why I chose the MT. Stout and cheap.

Between the choices of ratios, given the choices in intermediate gears and motor pinions, there are many sweet spots waiting. We may have many choices in motors.

This cluster can approached from both sides, and can be mated along a wide arc of the primary spur. A little thought, and a very compact system is yours.

And, again...what do we lose by going back to wider wheels?

On the wider wheel, you loose a little bit manuverability for comps IMO. Not to mention depending on where you want the offset the wheel can get in the way and reduce your turning radious. It would help for covering up the motors and such. Other reason it it really limits your tire choice which is why you see them narrowed so that you can use the moab sidewalls and part of the 2.2 side wall and get your 8 inch wheel. The main reason I want to stay away from the 540 motor is the over all weight of the wheel. We don't want to make this too heavy because then we'll have issues with traction on the rocks.

 

[ekd]

Merry Christmas, guys!

Makes sense, A. We may have plenty of tire work to try soon.

164gr. We have room to grow here.

On the wider wheel, you loose a little bit manuverability for comps IMO. Not to mention depending on where you want the offset the wheel can get in the way and reduce your turning radious. It would help for covering up the motors and such. Other reason it it really limits your tire choice which is why you see them narrowed so that you can use the moab sidewalls and part of the 2.2 side wall and get your 8 inch wheel. The main reason I want to stay away from the 540 motor is the over all weight of the wheel. We don't want to make this too heavy because then we'll have issues with traction on the rocks.

 

[ekd]

Something else to think about:

A very compact, strong, and precise trans case does not require a mill to produce. Think laminated padlock... A stick of fat Hardware Store AL can be cut into a stack of accurate leaves. Best part for guys like me... 1 F-up doesn't destroy the whole part. Make another leaf.

Through bolt it all (including the knuckle?), glue any together where it won't affect dis-assembly, place locating pins if needed... it'll work.

 

[Abavuso]

I was thinking about this today. I have to take some measurments first but I think I have a solution. If the numbers work out ill need a little help from you to spin off the 8 mm main shaft. After the kids go to bed tonight ill do up a drawing to show you what I'm thinking. Then ill be able to use my drill press to make the trans case with the plate aluminum.

Sent from my PC36100 using Tapatalk

 

[ekd]

Only the mill is down for upgrades. I can turn your parts, and ship free with the M/M kit, if you can wait a couple days more. The lathe is going down as soon as I can afford more of those DRO kits. It's my January mission. Gonna get serious about this tiny stuff.

LMK

 

[ekd]

A, if you make 1 of your leafs nearly the full dia of your wheels ID, think you could use it as an ESC heat sink, if I cut you a bolt on heat spreader?

What I want for Christmas (hurry!): (2) ESCs designed to run 2 motors at once, separately. Digs, etc integrated. Oh, and make it fit inside a wheel, so I can drive myself mad trying to fit a servo in the opposite one.

Make it 3... the Hawk.

 

[Abavuso]

Here's two options i was considering....

Aluminum HR Losi MRC Sput Gear - 60T - 10T Pinion

of using the aluminum version of the traxxas slash spur gear 68T - 10 T pinion...

for the motor I have a losi slider motor that i use to run on my MRC that's should have plenty of Tourque and speed for a single wheel aplication.

Now the idea is that the "transmission" will be packet between alluminum plates wil the beafy top and bottom so that the Trans is actualy the Kunckle. The spur will bolt to and 8mm drive shaft that you can put a 1/8th buggy 17mm hex on to it then the motor will sit towards the trailing end of the wheel instead of under it.

Either way, this should be about all of the motor that will hang out of the wheel its self.

I should be able to post the actual design later on tomarrow.

 

[monkeyracer]

A - those ratios are only 6:1 and 6.8:1, I thought you were trying to get close to 80:1, or are you saying the laminated aluminum will house some step-down gears to get some better ratios?

 

[Abavuso]

That's what I'm shooting for. I supose I don't fully understand how to do gear ratios. This layout was just to show how much space with each you would have. I guess I didn't explain it well. If you use the MT gears to step and one of these two gears as the final then you should get a decent ratio. Close to 80 to one. I think.

Sent from my PC36100 using Tapatalk

 

[ekd]

Something to ponder:

As the MIW is the only system that can do this... we'll have to try +0- offset of the knuckle from the vertical plane of the axle. Like a chair caster, without the overhead kingpin. A little "trail" or "lead" might have serious effect on turning in the tight stuff.

Is anyone else constantly thinking about the million or so ways to attach 4 of these to each other??

A's torsion "Ricochet" ( http://www.rccrawler.com/forum/superclass-crawlers/345681-if-there-were-no-rules.html ) is not only a real possibility... but if I can make it work, so either the cam crane doesn't have to be stout enough for flipping the rig... or it won't need a heavy linear actuator to fold the frame... I may be comping with you guys, someday.

 

[ekd]

With MIW, we will want wheels with 100% + offset. The scrub (if any) will be determined inside the wheel.

This is almost too cheap (that woke Don up..."thumbsup"). I'm staring at a heavy Tupperware cylindrical container, and wondering how many different wheels the dollar store stocks.

 

[Abavuso]

I need to pull out the gears from my trans so that I can get exact measurments to start designing the in wheel trans. I just need to find one final large gear to attach to the axle stub to further reduse the ratio.

Or I can make a single mount to house the spur gear and just bolt that gear motor to it. Humm.

 

[Abavuso]

Finaly got some time to look over my rig after the last comp and survey the dammage... 1 broken lower link and that's it!!! So with the new modifications on the way, I've got the work bench prepped and here she is, ready for the upgrade Though I'm going to have to redo the lower links because I broke one, not to mention the new mounting location will be a little closser to the end of the axle.

 

[ekd]

Shouldn't be long. Got the mill up. "thumbsup"

 

[ekd]

Ready to ship.

 

[Die-Laughing]

Nice"thumbsup"

 

[Abavuso]

Ready to ship.

wow!!! those look purty!!!! Heeee, now I get to see how indestructable they are . Can't hardly wait!!!!

Thanks for all your hard work, just from what I'm looking at here, I think we have somthing here.

 

[ekd]

You and I have similar ideas of what pretty is... Wait til you spin these by hand. :mrgreen:

I'll have M's done asap... I'm dying to start on the Sweetheart. I showed T the pic of it with your MT, and she got a look on her face I liked a lot. Partly maternal, partly predatory. She is still loving seeing me envy one of her RCs. And, she is loving your design... she can't wait to do up the panels.

PO was closed today, I have arranged for shipment tomorrow.

Thanks, die-laughing. Stay tuned, we're just getting started here.

 

[ekd]

I need electronics help here. Soon.

Could the transmitter circuit of a twin stick Tx be replaced with servo tester boards, to create a wired remote for power feeding my mill? I need to be able to lock out individual axis/directions in all possible patterns.

TIA, guys.