Effect of spring force on acceleration

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Discussion Overview

The discussion revolves around the effect of spring force on the acceleration of a treadle hammer, specifically focusing on how the force exerted by a spring influences the impact force when the hammer strikes. Participants explore concepts related to impulse and impact force in the context of a design involving an 8-pound hammer head and a 20-pound extension spring.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant seeks to understand how much additional force a spring contributes to the hammer's force during its fall.
  • Another participant suggests considering "impulse" rather than just force when evaluating impacts, indicating a potential shift in perspective on the problem.
  • A later post questions whether the impact force can be calculated by summing the spring's maximum load and the weight of the hammer, proposing a total of 28 pounds for impact force calculations.

Areas of Agreement / Disagreement

Participants have not reached a consensus on how to calculate the impact force, and multiple viewpoints regarding the relationship between spring force and impact force remain present.

Contextual Notes

There are unresolved assumptions regarding the definitions of force and impulse, as well as the specific conditions under which the calculations are made. The discussion also lacks clarity on the implications of the spring's characteristics on the overall dynamics of the hammer.

jzzdrmr
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Okay, so I am designing a new treadle hammer and I want to know how much force a spring will add to the force of the hammer.

Basically I have an 8 pound head that can either fall at the speed of gravity or be forced down by a 20lb extension spring.
search

The attached image is not my design and I don't own the image. But, it is similar to what I am doing.
 
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jzzdrmr said:
Okay, so I am designing a new treadle hammer and I want to know how much force a spring will add to the force of the hammer.

Basically I have an 8 pound head that can either fall at the speed of gravity or be forced down by a 20lb extension spring.
search

The attached image is not my design and I don't own the image. But, it is similar to what I am doing.
Welcome to the PF. :smile:

The image did not Upload for some reason. Is it a PDF or JPEG?

When thinking of impacts, think more in terms of "impulse" rather that force. You can search for more info on impulse to help out.

If you can get your image to Upload, we can be of more help.
 
berkeman said:
Welcome to the PF. :smile:

The image did not Upload for some reason. Is it a PDF or JPEG?

When thinking of impacts, think more in terms of "impulse" rather that force. You can search for more info on impulse to help out.

If you can get your image to Upload, we can be of more help.

I don't know why it won't show up. I tried to upload it on my phone, that's the problem I would guess. Unfortunately I don't have a url for any images. How ever if anyone uses on shape the file is called, sff001. I would also appreciate it if anyone could search treadle hammer and up load that...
 
Last edited by a moderator:
Okay so i did a little more googling and think what I am trying to find out is impact force. Basically if an extension spring's max load is 20 lbs and an 8 pound object is pulling on it, does the final mass for impact forge calculating 28 lbs?
 

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