Hello I am new to design and 3d printing.

I am trying to find a program to create a ring with teeth on it to drive a snowmobile track. I have been using Freecad to try and design it with no success.

I essentially want to make a gear with a large inner circle and largely spaced teeth. I am trying to make a ring 1.5" wide x .25 thick with a circumference of 30.5" and 11 equally spaced teeth. teeth size is .75"x.75"x.75". The teeth should work out to 2.86" approx. apart from each other on center.

I have tried using freecad FCgear Module but it won't let me make something with the teeth so far apart or I just can't figure it out.

If someone could please help figure out how to lay this out that would be greatly appreciated or at least point me to a software that could make this easier for me.

Thanks in advance.