gerabox ration and torque selection

[Divyakant]

I am sending one jpg file for TurnTable design.
In this file upper design is Topview of 2 x2 feet fabricated box.
down side design is side view of Turntable.

I have to put 250 kg to 1000kg toad on turntable and turn it 360 degree.
I require 250 kg. thrust load ( axial load) capacity gearbox,but should be compact and low weight.
same as other turntable up to 500 kg and 1000 kg. for three types of efferent load capacity.
We will use stepper motor for run this Gearbox.

Tell e in Nm and Kg

Pl. call me if any question.

 

[tbuelna]

Ring....ring...

Hello, I'm calling to let you know that there is no .jpg file linked to your OP. I also want to let you know that it would be very helpful if you provided a more detailed description of your design problem.

Thank you and goodbye.....

 

[Divyakant]

There is a posting file ( attach) problem, so i ca not upload a jpg image file

 

[Divyakant]

 

[tbuelna]

The ratio of the gearbox will depend on the mass properties of your supported load, and the rate at which you wish to rotate the load 360deg. The torque capacity of the gearbox should consider the peak dynamic forces seen from starting and braking the rotating load. If your drive motor has a stall torque of 8.5N-m, then that would be the limit for input torque. The output torque of the gearbox would be the drive ratio minus mechanical losses in the system.

There will also be a load reversal on the gears when you transition from driving the load to stopping the load, due to backlash in the gear meshes, assuming of course that your drive motor has some sort of braking ability. This dynamic loading on the gear teeth should be accounted for when sizing the gearbox.

If the mass center of the supported load is offset laterally from the gearbox output shaft center, then you need to account for some moment force on the gearbox output shaft bearing in addition to the axial force.

 

[3DDave]

tbuelna - Ring....ring... That's very funny. Approaching Knock, knock funny.

The OP is still missing including a lot of information one would expect, like desired output rpm; desired rate of acceleration, power available at the motor. Very underspecified. I would also consider placing the turntable on it's own wheels like a lazy susan so the gearbox is entirely free of thrust and over turning moment loads.

In view of the last part, how is the 1000kg mass (not a load, really) reduced to a 250 kg mass (also not a load) at the gear box?