3D Printed High Load Linear Actuator by MechEngineerMike

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You can buy linear actuators off the shelf, but none that allow for accurate displacement measurement AND high load rating for this price. The finished model shown can push or pull up to 300 lbs and it moves at about 0.5 in/min. I used it on a special project but you can use it for whatever you want!

This assembly is a component of the Testrbot open source universal test machine: http://www.instructables.com/id/TestrBot-The-300-Universal-Test-Machine/

I’ve also provided ‘Base Type 2’ files if you want to make a higher speed configuration. (In this config you wouldn’t need the gears, as seen in photo 3.)

Printing Instructions
For complete Excel bill of materials see ‘Actuator’ section of TestrBot BOM here:

I picked a stroke of 5.375”, but the actuator can have any stroke you want. I have provided the equations below for determining the actuator component lengths for a given stroke, in case someone wants to use this design for something else.

Stroke = You pick!

Small PVC pipe length = stroke + 3.125”

Large PVC pipe length = stroke + 1.625”

Anti-Rotation Rod length = stroke + 2.625”

Threaded Rod length = stroke + 4”

Printing Stats
Slider_Mount.STL Time: 4h 20m 55s Filament used: 4.27018m
Small_Gear.STL Time: 2h 40m 15s Filament used: 2.56071m
Large_Gear.STL Time: 6h 15m 2s Filament used: 5.90004m
Actuator_Base.STL Time: 16h 39m 43s Filament used: 16.3605m
Actuator_Top.STL Time: 17h 16m 0s Filament used: 17.5615m
base_TYPE_2_FOR_MOTOR.STL Time: 5h 41m 2s Filament used: 5.35894m
base_TYPE_2.STL Time: 12h 11m 2s Filament used: 12.1683m
ACTUATOR_FOR_THINGIVIEW.STL Time: 48h 58m 44s Filament used: 40.963m
2.75_gear_driven.STL Time: 4h 33m 10s Filament used: 4.58523m
2.75_gear.STL Time: 4h 41m 10s Filament used: 4.70947m
actuator_accessory_clip_2in.stl Time: 2h 32m 59s Filament used: 2.3179m
actuator_accessory_clip_1in.stl Time: 1h 20m 4s Filament used: 1.21963m
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