Design Large Spur Gear - 44in CNC Shop Bot

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A user is designing a 44-inch spur gear for a CNC machine and is struggling with calculations for the number of teeth and diametral pitch to achieve larger teeth. They are unsure how to determine the appropriate number of teeth based on the pitch diameter and have ended up with teeth that are too small for their project. The discussion references the need for formulas from The Machinery Handbook and mentions the complexities of using irrational numbers like pi in practical applications. Additional resources, such as a specific gear catalog, are suggested for further guidance. The conversation emphasizes the importance of accurate calculations in gear design.
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Hi, I am new to this forum so forgive if i am mis posting or multi posting. I am in the process of designing a 44 inch gear to cut on my shop bot cnc machine. I have been up and down calculations but i end up with tiny teeth and can not find the right formulae to calculate an oversize spur gear. Any thoughts ?
 
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What exactly are you trying to calculate? What do you mean by "tiny teeth"?
 
pantaz said:
What exactly are you trying to calculate? What do you mean by "tiny teeth"?

I am trying to build an oversize gear with large teeth. Given a Pitch Diameter(D) of 44" I am trying to find how to base the number of teeth (N) in order to calculate Diametral pitch(P)

Pitch Diameter is D=N/P

Number of teeth is N=D x P

Diametral Pitch is P= N/D

Based on that, we have D but I am not sure what to do about knowing what the propper amount of teeth would be or do you just pick em and go with it.

I picked a number and went with it for fun and when i was done calculateing addendum, dedendum etc I ended up with teeth that were around 1/2 big. It would work, but i need larger teeth for this project.

I also need to check to see about the radius used to make the sides of the teeth. I read that there is a chart of info on this . Need to find my machneries handbook!
 
Pi is irrational, where do the left over digits go?
 
Doug Huffman said:
Pi is irrational, where do the left over digits go?

doug, what the hell you want me to do with that statement ?
 
I am traveling at the moment and for the week. I don't have my library handy. ISTR I seem to recall that there are formulas in The Machinery Handbook for setting up gear cutters. The extra digits of irrational numbers are a typical problem for real world problems.
 
Doug Huffman said:
I am traveling at the moment and for the week. I don't have my library handy. ISTR I seem to recall that there are formulas in The Machinery Handbook for setting up gear cutters. The extra digits of irrational numbers are a typical problem for real world problems.

im just trying to find my copy of MHB right now
 
QTC has their http://www.qtcgears.com/Q410/Q410Cat.htm" . The spur gear calculations are universal.
http://www.qtcgears.com/Q410/Q410Cat.htm
 
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