Is the Aren Hill hole the spiky circle where the motor shaft comes out? If so, I don’t understand how the spikiness makes the motor easier to remove?
So what I think it means is you have the grooves help keep the motor pilot hole in dead center with it being a .75 hole.
But the grooves allow you to slide in a larger gear, just need to rotate the gear when bringing it in and out. This allows you to use the 13/14 teeth pinion, while not compromising the pilot hole.
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Update Time:
Taking some of the advice given here, to better improve the design and make it a bit smaller.
The gearing has changed a little now.
The Neo gearbox is 10.06:1 with a speed of 12.66 (Now using a 12 to 42 for stage 1 and 16 to 46 for stage 2)
The Falcon gearbox is 10.98:1 and a speed of 13.05 (Now using 11 to 42 for stage 1 and 16 to 46 for stage 2)
Biggest differences now is the falcon gearbox now weighs 7.313 lbs and the neo weighs 6.7 lbs (not including sparks maxs)
The gearbox is now a bit smaller in profile, and the only parts to change between the two is the motor, motor pinion, output shaft and standoff.
Reasonably a 10 minute or less swap switching from one motor to the other.
In the meantime the design was also built using the configuration tool so in the cad we can instantly swap between the two and it adjust itself.
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The dual output drive is something that intrigued us on 3015 after seeing it done on 340 for the past few years.
We switched this year primarily for the reasons outlined, we like the direct driven redundancy and the removal of the additional belts. We also took the additional step of eliminating the gearbox plates and integrating the gears into the drive rail letting the rail act as the plates. This resulted in the lightest and cleanest drivetrain we’ve ever built.
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This is cool. Was there a reason for 3 motors per side other than “cool”? At <150 lbs and ~13ft/s it seems like 4 motors is quite sufficient. yes?
The 3rd motor helps take load off of each other.
If you only had 2 motors you’re going to be drawing a lot more amperage.
For the neo drive, 2 motors draws 60 amps each while being pushed. And you will pop a bbreaker in a few seconds.
I’m the 3 motor set up, you wind up putting 40 amps per motor.
I understand your thinking, but doesn’t everyone pretty much use 4 drive motors and it works fine?
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What size rail are you using there?
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Yes, 2 motors per gearbox will work just fine but the amperage per motor is such a significant difference between 2 and 3 motors when getting pushed or pushing it will help on our end.
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You can get marginally more tractive force going from 4 to 6 motors depending on current limiting & battery status.
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Looks like the big win might be in braking (if that’s important to you, of course). Still, seems like a lot of your motor budget, but depending on your design goals could be a worthwhile trade-off. Thx.
1.5” x 2”
.125 Wall
This is really compact and cool!
Do you have any more pictures of it? Would’ve loved to see it up close at Buckeye.
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