We're running 4:1 after the drill, but of course the drill is pretty big. Size isn't everything (shh! Lol), but it's quite punchy. If you have a smaller motor (885 can or less) you may want to gear higher. That said if you're powering the rear "leg" in a four-bar there's a ratio so you may be fine.

I don't actually know what ratio our drill has in low speed, only that it is about 400rpm at nom. voltage. We're overvolting to where that rpm is theoretically around 580rpm. Take 4:1 from there and the weapon would do about 145rpm. We just kind of round that down, allowing for load and losses, to about 120rpm on the weapon. If you aim for something along those lines you should topple other machines over nicely.

One thing I'll say, though, is that make sure the transfer from the drill to the weapon business is up to it. You may remember we had a real struggle to contain the torque when T2 came into being. Keep the torque limiter if those dewalt gearboxes have one, on its near-max it shouldn't slip when lifting but should when the weapon can't move. It's awful to hear and look at when it kicks in but I think it has saved us more than once!