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# STEPPER MOTOR AND WORM GEAR (maths)

Discussion in 'Homework Help' started by isakiwanuka2013, May 12, 2013.

1. ### isakiwanuka2013 Thread Starter New Member

May 12, 2013
4
0
Hello

i need help with a project i am building but need help proving the theory..

from the ATTACHED image... i have a satelillte (20 kg) mounted on to a flat THIN disk

the flat metal disk weight is 10 kg

and it is 50 cm in diameter

connected at the bottom of this metal disk is a gear connected to it

which will be driven in a worm gear configuration

so i wanted to calculate the force needed to rotate the disk 180 degrees in 10 secs

and also the torque required .

it will be driven by a stepper motor

because if i can find the torque i will be able to select appropriate stepper motor and worm gear.....

this is using more math than anything

I don't just want the answer i want to know which formulas to use and how to do it

i want to understand more than anything and learn

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3. ### isakiwanuka2013 Thread Starter New Member

May 12, 2013
4
0
thank you very much

I am finding the website helpful

lol I feel embarrased to ask this

but as i am doing the calculations i was wondering

is 5Kg the same as 5Kg-m^2

????

4. ### isakiwanuka2013 Thread Starter New Member

May 12, 2013
4
0
or

I have a thin disk that

In weight is 30 Kg in total

It is 0.5 meters in diameter

So moment of inertia is = I = 0.25xMxR^2

So I = 0.25x30x0.25^2 = 0.46875 kg-m^2

is that correct