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blog Submitted by Gareth on Wed, 06/10/2015 - 08:36
Here is a collection of 3D printed Gear systems I am currently working on.
Project (1) :- create an in-finger joint stepper motor using these mini steppers
Pros :- light,surprisingly very accurate, cheap,fast, very robust (easily tolerated 8.4volt lipo on coils)
cons :- No torque, no static hold "limp biscuit" , tiny 1mm screw shaft.
Verdict :- Fail, maybe only useful as indictor arms
Project (2) :- Create a linear actuator using these standard metal geared motors 200:1
2cm linear movement / revolution.... total 4cm movement (enough for a finger I was thinking). Design needs a feedback potentiometer, also I will include a pulley like wheel fixed to the bottom of the motors base for facilitating tendons/fishing line.
Pros :- light, metal, good torque for motor size, 200:1 ratio, 6 Volt
Cons :- my 3D screw was binding in the Nut mech. so needs redesign, will have to be careful with the stabalising support rod fixture (you can see the 3mm hole above the "L" on the keyboard) I will use a stainless steel bike spoke though it and attach this to the base of the motor.
Verdict :- Win! (awaiting redesign)
Project (3) :- Electronic Di2 gear shifters for my road bike...
Pros :- very cost effective, easy to implement.
Cons :- Needs lots of Torque (needs metal gears), needs good fixing mech, needs water proofing.
Verdict :- Win! (test proves its worth perusing , so awaiting redesign maybe with linear actuator)
Project (4) :- Linear actuator lightweight Stepper motor
Specs :-
Stroke :- 45mm
Speed :- Circa 1cm/sec using a 2 cell Lipo battery
Force :- Easily 3Kg (my kitchen scale max_ed out so could not measure over 3Kg)
Cons :- requires H-bridge and analog input for feedback positioning
Great job....
Gareth,
Thx for sharing these awesome tiny gadgets... great job on these... Kudos...
Dincer
Wow .. Gareth's smorgasbord
Wow .. Gareth's smorgasbord of actuators ! - very cool and informative with the Pros & Cons of each tasty item !