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Project: Custom 3-Belt Drift Chassis

Posted: Thu Apr 07, 2011 1:03 am
by lance
Okay, so the OTA-R31 was out. It was great! Two of the guys here have them.
I have a Sakura Zero for drifting and it's an 'OK' car for CS drifting but is limited in things like weight distribution.
I had put lead weights on the bumper for it to slide better.

I had several ideas of how to convert it to a front-mid mount motor and a 3-belt drive.
But this one looks promising:

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Just a rough 3D I made..

This will make the adjustment of the front's IDR easier. In the OTA-R31, the rear's IDR varies more than the front's.
As the OD ratio becomes bigger, the Rear IDR becomes less putting more load to the motor. Although you can adjust the FDR by changing pinions and spurs, it's gonna cost a lot of money to collect them.

With this new design we can let the rear's IDR stay constant, keeping the FDR, and easily make the front drive slower by changing the pulleys. No more thermal shutdowns for you ESCs.

Will need new belts for the middle and rear drives and hope they are available with minor tensioner adjustments. Looking at Fujin's or Xpress' rear belts for the middle and TA-05v2 or OTA-R31 middle belts for the rear. Need to take more measurements before I can finalize the motor mount.

Will need new upper decks as well. But that's not hard to do.

Just need to finalize the design and get a CNC Machine shop to make the parts. some testings and it's off to the track.



Please do share you thoughts.

Re: Project: Custom 3-Belt Drift Chassis

Posted: Thu Apr 07, 2011 3:08 am
by aliceisadog
Cool this will be interesting, keep us posted mate.

Re: Project: Custom 3-Belt Drift Chassis

Posted: Thu Apr 07, 2011 10:31 am
by stuffcc
I love projects like that !
I want to do like that, convert a chassis or make my own, but no money to do make parts by factories who got CNC machines (that I don't own, just a traditional machines)...

Good luck ;)

Re: Project: Custom 3-Belt Drift Chassis

Posted: Sat Apr 09, 2011 1:14 am
by lance
Thanks guys!


new drawing: belts added

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Re: Project: Custom 3-Belt Drift Chassis

Posted: Sat Apr 09, 2011 2:15 am
by stuffcc
Is that SOLIDWORKS or TOP SOLID that you use for 3D render ?

Re: Project: Custom 3-Belt Drift Chassis

Posted: Sat Apr 09, 2011 4:50 am
by tamiya
stuffcc wrote:I love projects like that !
I want to do like that, convert a chassis or make my own, but no money to do make parts by factories who got CNC machines (that I don't own, just a traditional machines)...


excuses smexcuses :P

U don't need CNC machining unless you wanna make 1001pcs all identical.
Time taken to draw CAD etc ... an old skool machinist would have
knocked it out ready for testing by now. ;-)

Parts like that bridge... just an endmill job IMHO.
Bolt 2 slices of alu plate together and work as 1.

Re: Project: Custom 3-Belt Drift Chassis

Posted: Sat Apr 09, 2011 6:42 am
by mart1nn
If you are going for 3-belt why don`t you go for something like stufcc`s VDF (big fan btw ... would really much like to convert mine also). It seemed really quiet and you will forget to worry about wearing pinions and spurs on parkinglots.

Re: Project: Custom 3-Belt Drift Chassis

Posted: Sat Apr 09, 2011 10:23 am
by lance
@tamiya, if only I had access to milling machines and drill presses, you'd already be seeing videos of it run. ;)
but my time is limited and i'd rather spend more time planning than exhausting my efforts in travelling to and from machine shops just because the measurements were wrong or something like that.


@martin, i loved stuffcc's FBD as well. but my main focus right now is to work with most of the things that are of "standard" and are mostly available.. love to have mine with an FBD as well.. :D

Re: Project: Custom 3-Belt Drift Chassis

Posted: Thu Apr 21, 2011 7:56 am
by lance
one more drawing.. :D
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Re: Project: Custom 3-Belt Drift Chassis

Posted: Thu Apr 21, 2011 8:22 am
by tamiya
looking good

think about putting spur on the front pulley, can get away with a smaller gear instead

Re: Project: Custom 3-Belt Drift Chassis

Posted: Thu Apr 21, 2011 9:39 am
by stuffcc
Nice ! ;)

stuffcc wrote:Is that SOLIDWORKS or TOP SOLID that you use for 3D render ?


? :Shifty:

Re: Project: Custom 3-Belt Drift Chassis

Posted: Thu Apr 21, 2011 8:31 pm
by lance
stuffcc wrote:Nice ! ;)

stuffcc wrote:Is that SOLIDWORKS or TOP SOLID that you use for 3D render ?


? :Shifty:


It's AutoCAD. :D

Thanks!


@tamiya, I thought of that too. But there were more "cons" than "pros".
- using gears will make the ratio between the middle pulleys constant.
- noisy and increased chances of getting stones in the teeth.
- will require adjustable shaft position to set the mesh correctly when using another pair of gears.



Thanks guys!

Re: Project: Custom 3-Belt Drift Chassis

Posted: Fri Apr 22, 2011 1:12 am
by tamiya
lance wrote:@tamiya, I thought of that too. But there were more "cons" than "pros".
- using gears will make the ratio between the middle pulleys constant.
- noisy and increased chances of getting stones in the teeth.
- will require adjustable shaft position to set the mesh correctly when using another pair of gears.


no no no... i just meant put the spur on the front layshaft instead of the rear - change nothing else

i'm assuming front shaft runs faster than rear shaft with the beltdrive reduction in between;
you can use a smaller spur on front shaft & still keep the rear shaft turning same speed

= lower overall profile, spur less likely to chew thru your windscreen ;)

+ added benefit, as front pulley is "bigger" u can use the whole pulley as spurgear mount
and there's less chance of spur screws poking thru to foul the centre belt as-is now

Re: Project: Custom 3-Belt Drift Chassis

Posted: Sun Apr 24, 2011 6:31 pm
by lance
tamiya wrote:no no no... i just meant put the spur on the front layshaft instead of the rear - change nothing else

i'm assuming front shaft runs faster than rear shaft with the beltdrive reduction in between;
you can use a smaller spur on front shaft & still keep the rear shaft turning same speed

= lower overall profile, spur less likely to chew thru your windscreen ;)

+ added benefit, as front pulley is "bigger" u can use the whole pulley as spurgear mount
and there's less chance of spur screws poking thru to foul the centre belt as-is now



If I'll keep the Spur in the front lay shaft, the configuration will be the same as the OTA-R31 (which I am trying to improve) and no, the front shaft will be turning slower.
The size of the spur is critical as the size of middle pulleys differ. The main reason that TCDs/VDFs use big spurs is to ensure the pulleys clear the motor.
No trouble with the screws as the minimum middle pulley that I will use is a 16T TA-05 pulley.

About the "low over-all profile" thing, the max height is barely 70mm from the lower deck. I can make this as low as possible - maximum height will only be the diameter of the spur. But it will present a new list of considerations: mainly, I will have to use saddle pack li-po batts (which I don't have :D ). But we'll see if I choose the LP route.


Thanks for the inputs! :up: much appreciated!

Re: Project: Custom 3-Belt Drift Chassis

Posted: Fri Jun 10, 2011 6:10 pm
by Noz
wwwooooooo :shock: :shock: :shock: >>>nice idea my friends, keep update yoo......it's make me more thinking to change my TRF-415 became FMS also...

Re: Project: Custom 3-Belt Drift Chassis

Posted: Tue Sep 06, 2011 1:24 am
by lance
Update.. After a billion years.. :D

Some changes in the original design but nevertheless, the same concept.
Got the pieces waterjet cut so the edges are rough.. Counterbored holes were done manually.. :l

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Will clean up the parts before installing..

Next is to mount this little thingy on the actual chassis. Which is going to require a bit of accuracy.. :D

Re: Project: Custom 3-Belt Drift Chassis

Posted: Tue Sep 06, 2011 2:11 am
by Andychain
Wow, you got it all together |O| Nice work!
Looking forward to the testdrive :up:

Re: Project: Custom 3-Belt Drift Chassis

Posted: Fri Sep 09, 2011 7:21 am
by lance
Thanks Andy!


Update..

Holes for motor mount and servo were done (hopefully correct).

I'll need to get something to hold the battery though.. R2 Hobbies perhaps?

And upper decks.

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Re: Project: Custom 3-Belt Drift Chassis

Posted: Fri Sep 09, 2011 7:31 am
by lance
Low rev test run


Re: Project: Custom 3-Belt Drift Chassis

Posted: Fri Sep 09, 2011 9:09 am
by Andychain
Totally cool, looking truly fantastic!

Re: Project: Custom 3-Belt Drift Chassis

Posted: Sat Sep 10, 2011 12:44 am
by Saitama_D
Fantastic work.

Re: Project: Custom 3-Belt Drift Chassis

Posted: Sun Sep 18, 2011 1:25 pm
by beetledrift
really awesome dude!

how is your weight distribution?

Re: Project: Custom 3-Belt Drift Chassis

Posted: Mon Sep 19, 2011 5:44 am
by lance
Thanks for the comment guys!

@beetledrift, now it's better than it used to be. May need to train the driver.. *-| Thanks!


Currently running:

rear 37/22
middle 16/30
front 16/40 (COW and heavy oiled gear diff combo)

giving me a 1:2.79 OD ratio and can easily increase the ratio by changing the rear pulley combination.

Here are some more pics of the "unfinished" work. I still need to have something to mount the battery.
I'll make a video soon.

'til then.. cheers!

Note to self: pics first before playing.. :D

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Re: Project: Custom 3-Belt Drift Chassis

Posted: Mon Sep 19, 2011 8:12 pm
by streetstyle
SICK!!!!!
|O| |O| |O|

Re: Project: Custom 3-Belt Drift Chassis

Posted: Fri Sep 23, 2011 5:33 am
by lance
Thanks!


So, what if it was 3.44 instead of 2.79?

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