## Vex Pneumatic Shot Calculation vs P_regulation

 How many shots are available vs the regulation pressure , p_ref?Data applies to Vex Pneumatic piston kit, double acting cylinder. p_ref_psig psig Regulated pressure A_push 0.12 in^2 Piston area push A_pull 0.1 in^2 Piston area pull stroke 2 in Full stroke = 2 inches n_actuators 1 Number of actuators required at p_ref selected n_tanks 1 Number of resevoir tanks available l_tube 8 in total tubing length between regulator output and piston (include width of solenoid path as tubing) d_v_tube 0.10 in^3 =PI()*0.125^2/4*l_tube V_tank 9.15 in^3 Resevoir Tank volume (ignores the tubing on upside of regulator) p_tank_g 100 psig Initial tank pressure (guage) Volumes lost with each piston actuation , nominal stroke 2 in + .8in end gap d_v_push=(A_push*(stroke+ 0.8)+ d_v_tube)*n_actuators*(1-14.7/(p_ref_psig+14.7)) d_v_pull=(A_pull*(stroke+ 0.8)+ d_v_tube)*n_actuators*(1-14.7/(p_ref_psig+14.7)) V_tank_p_ref=V_tank*(p_tank_g+14.7)/(p_ref_g+14.7) V_avail=V_tank_p_ref-V_tank Avail air volume at p_ref N_shots=V_avail/d_v p_ref_ psig N_shots pull N_shots_push N_cycles 80 6 5 3 75 8 7 4 70 10 9 5 65 13 11 6 60 16 14 8 55 20 17 9 50 24 21 11 45 30 26 14 40 36 32 17 35 45 39 21 30 56 49 26 25 73 63 34 20 97 84 45

To estimate effect of different number of actuators and tanks multiply the N_shots given in table by N_tanks/N_actuators.

### One Response to Vex Pneumatic Shot Calculation vs P_regulation

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