great idea, but you are kinda limited on range of motion.

a pneumatic cylinder would work well for this too

To move verticaly a canion you don't need more motion...

To move verticaly a cannon you don't need more motion...

That's right, most main battle tanks only have elevation of 20 degrees total, including depress.

That's right, most main battle tanks only have elevation of 20 degrees total, including depress.

yeah but im just thinking for anything in general , that includes Flak and artillery too.

but if both the green axle is fixed and the red axle is fixed by the worm gear then the differential turns in the turret.

No, it doesn't. Maybe you build it a little different than me.

The differential inside the turntable isn't a differential in general. It is just the http://www.bricklink.com/search.asp?q=6573 without the diff gears inside it. And the green axle is a 9M going through the whole diff.

No, it doesn't. Maybe you build it a little different than me.

The differential inside the turntable isn't a differential in general. It is just the http://www.bricklink.com/search.asp?q=6573 without the diff gears inside it. And the green axle is a 9M going through the whole diff.

I meant to say that it's fixed to the elevation worm gear.

Yes, but that's the clue of the hole thing

The green is fixed at the chassis, the red is fixed to the elevation worm gear. Now, if the turret rotates by the blue axle you get an equal rotation of the red and green gears above the turntable.

They behave maybe like a planetary gear.

And because the rotation of these is equal the top diff ist standing still.

Or maybe i didn't understand yout problem

Well it turns out in my design I had 1 too many gears because I don't have any 3 wide diffs so it does indeed work.

Edited May 13, 201410 yr by Tommy Styrvoky