Linear Actuator -- Why is this not working?

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Discussion Overview

The discussion revolves around the performance issues of a linear actuator being used in a pulley system to lift a weight. Participants explore potential reasons for the actuator's struggle to lift the intended load, including power supply adequacy and mechanical friction in the system.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that the actuator is rated for 270 lbs but struggles to lift 40 lbs, questioning what might be missing in their setup.
  • Another participant inquires about the specifications of the power source, suggesting that voltage droop could be a factor affecting performance.
  • A request is made for a picture of the mechanism to better understand the setup.
  • A later reply indicates that switching to a 12V deep cycle battery resolved the current draw issue, suggesting that the actuator was not receiving sufficient power initially.
  • One participant raises the possibility of significant friction in the pulley system, which may not have been accounted for in the initial calculations.

Areas of Agreement / Disagreement

Participants express differing views on the causes of the actuator's performance issues, with some attributing it to power supply problems and others suggesting mechanical friction. The discussion remains unresolved regarding the primary cause of the actuator's struggles.

Contextual Notes

There are potential limitations in the initial assumptions about the system's friction and power supply adequacy, which may affect the actuator's performance. The discussion does not clarify the extent of these factors.

trickyrick0465
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I'm using the actuator that says its good for 270lb
https://www.princessauto.com/en/detail/12v-dc-12-in-stroke-270-lb-linear-actuator/A-p8507840e
I'm using the 4rth pully system from here
Pulley diagram
I'm using it to lift 40 lbs
So from the diagram I figured that to lift 40 lbs I need an actuator to handle 160 lbs 4 times what I want to really lift
I'm finding that it struggles to even lift 40 lbs
What am I missing
 
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trickyrick0465 said:
I'm using the actuator that says its good for 270lb
https://www.princessauto.com/en/detail/12v-dc-12-in-stroke-270-lb-linear-actuator/A-p8507840e
I'm using the 4rth pully system from here
Pulley diagram
I'm using it to lift 40 lbs
So from the diagram I figured that to lift 40 lbs I need an actuator to handle 160 lbs 4 times what I want to really lift
I'm finding that it struggles to even lift 40 lbs
What am I missing
Welcome to PhysicsForums.

What are you using for the 12Vdc 5Amp power source? Could it be drooping?
 
Welcome! :cool:
Can you post a picture of the mechanism?
 
berkeman
Thanks for pointing me in the right direction. The actuator couldn't draw enough current. Switched to a 12V deep cycle battery and works now. I've never used an Actuator when it lifts the weight it sounds like its under a lot of stress.
Thanks guys
 
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Likes   Reactions: berkeman and Lnewqban
Depending on your system, there can be a lot of friction in that pulley system. This does not seem to be taken into account in your work.
 

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