I want to use a servo to pull down a bar. The image shows in pink the anchor point and motion. Ideally, it would be a quick sharp movement from position A to B. The servo only goes 180 - but can be mounted anywhere under the bar as needed. I have a 3d printer so can print out something - just trying to figure out what kind of gear/lever etc would work for this. The bar is already attached to a mechanism that will spring back into position A when released.
Hello acitizen
There are several types of servos on the market available.
Make a search at the WWW simply.
Have a nice day and enjoy coding in C++.
Most servos take around 350 ~ 500 milliseconds to turn 180. Is that "snappy" enough? How will you release the servo so the arm can snap back, then reattach it for the next stroke? How much spring force will the servo have to overcome to pull the arm down? Search "Chinese trip hammer".
My question wasn't about what servos to buy.
Im not sure if it will be snappy enough - I would like to test but trying to figure out the mechanics ... I will look at the Chinese trip hammer. thanks
What makes this an Arduino question?
Use like a cam lifter design.
What force did you measure when you pulled the spring loaded bar down?
That can be a serious problem for a servo. Cheap hobby servos tend to burn out quickly if there is a constant load on the arm.
Think of some other methods to solve the problem. The simple picture in the first post is incomplete and does not provide enough information.
Use a ballscrew with a stepper motor to push it apart at the open end, or lever an extension from Position B through The Pink Parts. @Ballscrewbob
Solenoid?
I looked into solenoids, but it was a bit cost-prohibited as I need to do this with 30 different bars. I have servos on hand - but also could try dc motors or steppers if they will work better.
Solenoids more expensive than motors? Don't make sense!
We still have no idea of dimensions, lengths, angles, mass, speeds, etc.
You have to be more forthcoming with details.
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I have found some information on link geometry. I think that is what I am after in regard to how to utilise a servo to pull down a bar. Thanks for everyone's input.
Please update this thread with the results!
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