Yes I'm positive. I haven't measured it, it was just an object I placed on top so it was around 5kg I think. I'll probably just order a bigger motor and test it.
Hi,
Thanks, it's just the the entire mechanism involves a few gears and things like that as well, and it's quite complex so I'd rather avoid getting into that since we haven't even figured out the simple stuff.
I think i'll try to buy a much bigger motor and see what it can do for now :)
Thanks.
From what I understand they meant "bearing bore diameter [mm]" to mean the size of the ball bearing right?
I have a collection of them positioned at 45deg, but each one has a diameter of 8mm, yes.
The entire plate is 300mm in diameter if that's what you mean.
Yes sorry:
I think in the previous answer I made a x10 mistake again, but here is my new trial:
Let's say the plate+weight = 90kg, the ball bearing angle is 45.
So I calculated --> 90kg / 0.707 = 127.3 kg. That's the "equivalent dynamic load".
If I plug that into the second link you provided...
Okay so I calculated it and the 'frictional moment' is around 2.5Nmm, which is 0.0025Nm.
I'm a bit lost. This is quite a negligible amount isn't it? How can this help me understand the total torque needed for the system...?
@JBA
I've tried to understand what the first link says. I'm not sure I'm able to... it's really unclear to me what I should focus on that page..? What is relevant there? I can't understand what they are talking about... :/
Ah okay. Does rolling friction mean the following formula I found? :
Fr = μrN
where:
Fr is the resistive force of rolling friction
μr is the coefficient of rolling friction for the two surfaces (Greek letter "mu" sub r)
N is the normal force pushing the wheel to the surface
In this case, I...
@Dr.D,
I am totally aware that I have near-zero understanding of friction. Now that you say that I should be using Coulomb friction, I'll look into it. Obviously I'm here to learn more and understand things better to get a better result, so if you can explain about these things in depth, please do.
I've spoken with a friend who said I should take the friction coefficient between metal-plastic and multiply that times gravity and then times the Kg load I want.
Given an extreme example of a high load:
0.3 * (9.81 m/s2) * 120 kg = 353.16 Kg-m / s2
He said I should then multiply that by the...
Yes I've run some tests, it's around 5kg max, maybe a bit less.
Regarding the centered cylinder - that's the theory that I am trying to figure out - can we assume that it is perfectly uniform etc and centered and calculate the motor for that?