How to calculate the force to cut a log?

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Discussion Overview

The discussion revolves around calculating the force required to cut a log with specific dimensions (5 cm diameter and 120 cm length). Participants explore the necessary formulas and considerations for both perpendicular and parallel cuts, as well as factors influencing the cutting process such as saw thickness and RPM.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant seeks formulas to calculate the cutting force for a log and asks about determining saw thickness and RPM.
  • Another participant mentions finding resources online that provide formulas for circular saw design.
  • A woodworker shares that cutting speed and the type of wood significantly affect the power needed, suggesting that softer woods require less power compared to harder woods.
  • There is a repeated emphasis on the variability of power requirements based on cutting speed and wood type.
  • One participant expresses a need for more specifications to provide a more accurate calculation.

Areas of Agreement / Disagreement

Participants generally agree that cutting speed and wood type are critical factors in determining the force required, but there is no consensus on specific formulas or calculations to use.

Contextual Notes

Participants have not provided specific formulas or detailed calculations, and there are unresolved questions regarding the exact parameters needed for accurate force calculations.

Who May Find This Useful

This discussion may be useful for individuals interested in woodworking, mechanical design, or those looking to understand the dynamics of cutting forces in practical applications.

andrewtirtawijaya
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Good morning guys,

So i want to make mechanism to cut log with diameter 5 cm and 120 cm length. So how i can calculate the force to cut this log perpendicular and paralel. What is tbe formula i can use? And how i can determine the saw thickness and rpm needed to cut this log? Thanks guys for your concern. It will be usefull for me

Thanks ^^
 
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I tried a google search on "Circular saw design" and found lots of sites and calculators that provide formulas. For example:
http://www.thinkerf.com/formulas.htm
 
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My own experience as a wood worker suggests that a lot depends on how fast you want to cut that log. If you are willing to take it slow and easy, low power may be sufficient. If you are in a hurry, plan on lots more power. It also depends a lot on what kind of wood you are cutting. Soft woods cut more easily that dry, rock hard maple or oak.
 
Dr.D said:
My own experience as a wood worker suggests that a lot depends on how fast you want to cut that log. If you are willing to take it slow and easy, low power may be sufficient. If you are in a hurry, plan on lots more power. It also depends a lot on what kind of wood you are cutting. Soft woods cut more easily that dry, rock hard maple or oak.
Well I'll try to ask for more specification to my supervisor. But is there any formula that i can use to calculate it?
 

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