So my robot is gearing up a 600rpm motor to a 6 bar to lift. The motor rpm is pto from my drivechain. But i was wondering what would be the desired rpm to lift a robot? If i do a 36-84-12-84 it would be 35 rpm which id think would be fine. But our shooting mech is going to be on top of it as well so we need to be able to get up relatively fast so we can shoot over blockers. Im basically asking what is the fastest rpm that would be able to lift a 10 pound robot. Weight estimated. Im horrible with torque calculations
why are you using a 600 rpm motor just wondering. Usually you would use a red 100 rpm motor for high torque scenarios
I am pto from my drive chain and thats just the way i designed it
That is a lot of space taken up it seems but if thats what i must do
How many motors are you PTOing? How fast you can go depends on how many motors you have. At 100 rpm the v5 motors have a stall torque of 2.1 Nm, so 2 motors at 35 rpm will stall at 12 Nm of torque, meaning if the length from where your arm rotates to where it grabs the horizontal bar is 10 inches, the motors should be able to lift a max of around 60 N of force, or around 13.5 pounds. This means the ratio will work, but it could struggle a bit.
Were pto 2 motor and they are piston assisted so that will work fine, however, it is not to grab the horizontal bar, its to grab the vertical bar with a 6 bar. Does that factor into the 10 inches thing
You can approximate the weight the arm can lift by dividing the torque by the length of the long middle beam on your six bar. Here’s a calculator I threw together in desmos which should include the force from the pneumatic assist: Climb force calculator | Desmos. This should be a decent approximation of the amount of force the arm can lift, but it could be wrong because I don’t know the exact math behind pneumatics.
makes sense, thats a solid justification
also thanks for the spreadsheet thats a really nice resource assuming it is accurate.
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