Help me come up with a design

[Lonklin]

What is the best way that you all think that I can make these long two vertical pieces of metal spin on this stepper motor in the orientation as shown in the picture. I preferably dont want to cnc but I can and would if necessary. Thank you all!

 

[DaveC426913]

How fast?
How much load?
What kind of lateral forces do you need to contend with?

 

[Baluncore]

Welcome to PF.

Will you use the stepper bearings to carry the entire load, or will there be some heavier bearings provided to carry the mass and any unbalanced load?

Should the hub between the stepper motor and the vertical plates be rigid, or can it be rubber?

Perhaps you can tell us what you are trying to do with the mechanism.

 

[Lonklin]

Welcome to PF.

Will you use the stepper bearings to carry the entire load, or will there be some heavier bearings provided to carry the mass and any unbalanced load?

Should the hub between the stepper motor and the vertical plates be rigid, or can it be rubber?

Perhaps you can tell us what you are trying to do with the mechanism.

Sorry yall for my abiguosity. I'm trying to design and make the forearm for a robotic arm. ONe lateral force then will be gravity since the rig will be on its side when in operation. I'm just not sure of an efficient way to connect the stepper motor shaft with the two pieces of metal in which it can spin or what hub to use. The motor will probably max rotate 60 rpm. The load of the arm will definitely vary depending on what the arm is picking up. I guess my question I would ask you is: What is an efficient way to connect this motor shaft in such a way that is spins those metal pieces? Assuming that the metal sheets will rotate on a bearing of some kind. Or not im a newbie.

 

[Lonklin]

How fast?
How much load?
What kind of lateral forces do you need to contend with?

Sorry yall for my abiguosity. I'm trying to design and make the forearm for a robotic arm. ONe lateral force then will be gravity since the rig will be on its side when in operation. I'm just not sure of an efficient way to connect the stepper motor shaft with the two pieces of metal in which it can spin or what hub to use. The motor will probably max rotate 60 rpm. The load of the arm will definitely vary depending on what the arm is picking up. I guess my question I would ask you is: What is an efficient way to connect this motor shaft in such a way that is spins those metal pieces? Assuming that the metal sheets will rotate on a bearing of some kind. Or not im a newbie.

 

[Baluncore]

The stepper motor is able to move much faster than 60 RPM. Maybe the joint should include a reduction gear, maybe epicyclic, to increase the torque available.

The gearbox then becomes the connection, not the thin motor shaft.

 

[Lonklin]

The stepper motor is able to move much faster than 60 RPM. Maybe the joint should include a reduction gear, maybe epicyclic, to increase the torque available.

The gearbox then becomes the connection, not the thin motor shaft.

What do you think the gearbox should connect to?

 

[Flyboy]

How much weight do you plan to carry?

 

[Lonklin]

Welcome to PF.

Will you use the stepper bearings to carry the entire load, or will there be some heavier bearings provided to carry the mass and any unbalanced load?

Should the hub between the stepper motor and the vertical plates be rigid, or can it be rubber?

Perhaps you can tell us what you are trying to do with the mechanism.

How much weight do you plan to carry?

12 pounds tops

 

[Baluncore]

What do you think the gearbox should connect to?

The biggest possible ring gear, with a cylindrical housing, is connected to the extended arm plates. The motor is mounted to the inside of a cylindrical input housing, that is attached to the robot's frame. The stepper motor drives the smallest possible sun gear pinion, for the greatest reduction ratio. The motor body is attached to the planet carrier.
https://en.wikipedia.org/wiki/Epicyclic_gearing
The input and output housings are sleeved, so they can rotate and form a slow bearing.