Hi,
You have been assisting me with the "How fast will two spinning weighted wheels propel a 7 lb cylinder?" problem. I appreciate your help so far.
The problem I have posted is not exactly the problem I am trying to solve. I am working with a client on a patented invention and have posted...
1) units; miles - mi (incorrectly used M), lbs and hour - hr (incorrectly used H)
2) mass of cylinder is 7 lbs. Rotational inertia is I = mr2 = 0.019 lb⋅mi2
3) desired speed is 20 mi/hr, I have not figured out how to deal with translational plus rotational momentum. What is confusing to me is...
The cylinder reaches 4.3 MPH just before contacting the wheel, so initial translational momentum (mv) of the cylinder is 30.1 (lb⋅M)/H. For an object rolling without slipping, the angular velocity is equal to the translational velocity divided by the radius so the angular momentum (mvr) of the...
OK, I see that Kinetic Energy is not conserved and momentum is. I know the momentum of the ball is it's mass times it's velocity but I don't understand how to calculate the momentum due to rotation of the cylinder or the wheel.
Isn't there a limit to the mass the motor can spin? How do I know...
Before iterating a redesign of the drive wheels, I would like to determine the maximum speed I can achieve with the motors I have initially selected.
Am I looking at conservation of kinetic energy? The cylinder has x kinetic energy as it drops the 11.27" to the wheel. The wheel has y kinetic...
So if I want the cylinder to roll at 20 MPH and it is 8.5" in diameter it's circumference is 26.70" and will roll 26.70" in one revolution. So the ball will need to roll at 791 RPM. The wheel has a circumference of 13.35" so it will need to spin at 1582 RPM.
How do I determine the reduction in...
Yes, the cylinder is dropped into the shoot from above and is rolling when it engages the wheels. Yes, I want to reach 20 MPH or as close to it as I can.
I don't see how driving the cylinder from the end is more efficient or simpler, especially if a motor can be eliminated. Can you explain why...
I definitely want the cylinder to roll at max speed. OK, so having a drive wheel on the bottom defeats that and it can be eliminated. That makes the device much simpler.
How do I determine the best spacing (between drive wheel surface and opposing rails) and drive wheel surface configuration...
To assist in the calculation, the cylinder is dropped into the machine through a chute with Delrin rails via gravity until it engages the drive wheels. After it engages the drive wheels it continues on Delrin rails until it exits the machine. The goal is to propel the cylinder at the maximum...
I am a degreed mechanical engineer with many years experience developing industrial and consumer products. i am looking for assistance with understanding the physics of a system in a complex device i am working on.
Hello,
I am hoping someone on the forum can help me. I am designing a machine to move a cylindrical weight between to high speed rollers.
The system is comprised of two weighted drive wheels being spun by motors positioned one above the other as shown in the sketch. The weighted drive wheels...