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Old 2016.12.06, 04:47 PM   #31
Evil_Sephiroth
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Sounds good...

3d printing gears does not work very well at this small of a scale. Machined gears work best, and molded gears work ok. 3d printed gears have too low resolution to be fully accurate, and depending on process, they lack the durability. 3d printing is good for many applications, however, gears is not one of them. I tried 3d printing wheels, and the tolerances were not high enough for them to be good enough to use. Depending on orientation in the printer, you could have slightly oval wheels. That in a gear, would not be good.
I have access to a SLA 3D printer then we are at 0.01mm resolution if i use the max setting

With the fused deposit one is impossible, I know.
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Old 2016.12.06, 04:53 PM   #32
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ok then...i'll do a final question.

I've made a test again..

Without spur gear and pinion the car is like an hotwheels, it run forever if i slightly push it

With spur gear istalled (then with AWD connected) and no pinion the car move a little less but it'ss till smooth.

Is this ok? I mean i think that like in real car the driveshaft and the connection beetween the 2 differential produce a little friction
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Old 2016.12.06, 05:58 PM   #33
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Realistically, there should be almost no difference between having the rear spur installed or not. As long as it's not a considerable difference, it should be ok. It may need a little run in to break it in...

Run it for a few minutes, and check motor temps. If the motor is getting hot, then it may cause issues.

I wish I had access to a printer like that! I would have to learn more 3d design... But it would be fun to make some prototype parts.
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Old 2016.12.09, 06:51 AM   #34
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Ok i machined away another 0.02 mm from the spur gear where it touch the bearing..now all work perfect

I think i have a partially faulty chassis with a little wrong alignement beetween main driveshaft and the hole where the bearing go.

Probably my spur gear is a little more fragile atm, but with the bearing on i don't have movement then i think all is going to work fine.

Let's see in the future
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Old 2016.12.09, 11:56 AM   #35
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Glad to hear that you have found resolution with the binding. Let us know how it is down the road. On the negative, modifying spur gears to fix it means that any change in gear ratio by spur will be a pain since you need to machine it...
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Old 2016.12.09, 12:59 PM   #36
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Glad to hear that you have found resolution with the binding. Let us know how it is down the road. On the negative, modifying spur gears to fix it means that any change in gear ratio by spur will be a pain since you need to machine it...
I simply have to buy a set of spur for various gear ratio and machining it one time XD

also still have to see if the problem is only with 98mm wheelbase or also on other wheelbase setp
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