3D Printed Linear actuator
Here is a custom 3D printed Linear actuator for activating a lever or push/pulling something or other.
If you "Like" the STL files can be found here :- http://www.thingiverse.com/thing:308576
It uses a Cost effective Stepper motor (we all know which one).
From a previous static test i knew that the motor in this worm screw configuration could push close to 2Kgs of force (as measured against my kitchen scales)
The bugbear was thinking of a way to attach a feedback potentiometer to the worm screw...
....I tried linear potentiometers however they were limited in length...
. .... instead I used a 10 turn Linear Pre-set Potentiometer and geared it further down with spur gear.
The whole design was made using "Blender" ... I stuck to general 0.2mm clearances so everything slotted glove-like together.
Printing took a 2 hours, plus 2 more for tweaking .
Eco_Friendly Note :- When my print is under-way I place heat insulating foam around the print piece ...
..this stops the cooling fan dropping the temperature of the Heat-Platform unnecessarily, conserving Watts.
.. It also reflects heat back into the Heat-Platform and helps maintain a stable base heat.
Close-up of the Feedback pot .... its the key to the miniturisation . I have left circa 5mm room for adjustments.
I am pleased with the design (although I plan a few upgrades to add extra performance)
I have wired up the system and after a test run I am pleased with how precise the feedback potentiometer is. YAY
40mm (1.5") linear motion (It uses only 25% of the feedback pot ... meaning the leadscrew could be extended to 160mm (6 and 5/16")
Travel time 40mm = <3 minutes
Working Torque :- 1Kg continuous (although I know this stepper will achieve 2Kgs)