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Large Spur gear design 
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#1
Feb1410, 11:13 AM

P: 4

Hi, Im 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 ?



#2
Feb1410, 05:37 PM

P: 588

What exactly are you trying to calculate? What do you mean by "tiny teeth"?



#3
Feb1510, 07:17 AM

P: 4

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 ya 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! 


#4
Feb1510, 10:28 AM

P: 77

Large Spur gear design
Pi is irrational, where do the left over digits go?



#5
Feb1510, 04:09 PM

P: 4




#6
Feb1510, 04:19 PM

P: 77

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.



#7
Feb1510, 04:32 PM

P: 4




#8
Feb1510, 09:28 PM

P: 588

QTC has their metric gear handbook online. The spur gear calculations are universal.
http://www.qtcgears.com/Q410/Q410Cat.htm 


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