hi. put your arm in the inputs panel (lengths, masses, payload) and the results update as you type. armsizer works out the torque each joint needs and picks a servo with some headroom.
pick servos for this arm
Limits of this arm
same math as size it, servo weights as you entered them
Servos you already own
got one already? pin it here. other joints can use anything in the list
Cheapest builds
tries every servo × ratio at each joint, counts each servo's weight on the joints above it, uses checked prices only. base rotation not included
#
Build
Servos (shoulder first)
Cost
Servo mass
Smallest margin
Pose
grab a joint and drag it around (or tab to it and use the arrow keys)
Joint torque
kg·cm at the joint, worst case = arm straight out. The orange required mark must sit left of the blue servo max (through any reduction).
gravityaccelerationrequired (with safety factor)servo max (stall)at current pose