Screw 2-stage telescopic actuator 1

Input: yellow shaft.
Pink tube has a prismatic joint with the input shaft, a helical joint with the grey base (the first screw-nut drive), a helical joint with green center screw (the second screw-nut drive) and a revolution joint with the orange tube. The latter has a prismatic joint with the base.
The green tube fixed to the center screw has a prismatic joint with the orange tube.
The first screw-nut drive is of right hand thread, L1 mm lead.
The second screw-nut drive is of left hand thread, L2 mm lead.
If the input shaft rotates N revolutions, the green slider performs a displacement of N*(L1+L2) mm.
This video was made based on US patent US8220349.

STEP files of this video:
Inventor files of this video:

[pranavk]

amazing and genius too many screwing motions conflict the brain!

[adambergendorff]

So simple, so amazing!!! thanks for posting

[wicmontana]

Thank you for the great work and taking the time to do it.

[sprezzaturarrd]

How would you compute the axial force by the green slider from the motor torque driving the yellow slider?

[danistem]

i downloaded the step files, in cad only half of the model appears..if i print it as a half will it still work?? great work tysm for sharing

[pok]

very nice! Is it possible to share the STEP files? Thanks