[Alienvin]

Good Afternoon Jim,

Let's see how my math works out here.

If I go on 1/4 of the Stall Torque 4.4 in-lbs, which is 1.1 in-lbs. And my full extension of the arm is 56". 36" from the initial pivot to the second pivot which has a 1'6" extension that is the manipulator. So throw out 56" if it is FULLY Extended, the entire design weighs 10lbs, (I am going to build it so it weighs 7lbs) but let's give my self some breathing space. That'll give me 560in-lbs. So I'll need a minimum of a 560:1 Gear Ratio. Going on I am running the RS550 Motor on 1/4 loss in rpms. So if I put a Banebots 132:1 Gearbox on it, it will bring me down to 113.64RPM, then with an additional 6:1 or 5.4:1 or 4.8:1 reduction I will have my Ratio from 791.97:1 (18.94RPM) or 719.93:1 (21.04RPM) or 633.45:1 (633.45RPM).

I spoke to a Tech at Banebots this morning discussing efficiency with their gearboxes, they said using a 256:1 Gearbox would work, but also recommended that I stay lower in 104:1 to 132:1 Gearbox Ratios for better results.

What do you think Jim?

Vinny