# Involute Gear Tooth Width Explanation

Which goes over construction of involute gears, Everything else makes sense but I am still confused on what defines the tooth width.

Does someone have an intuitive/easy explanation on how you derive the tooth width for an involute gear and why it makes sense?

• are you talking about the tooth width space?
– NMech
Feb 24, 2021 at 19:37
• Well, there is a difference between a ideal gear design and any real practical one. Theres a lot going on in there. One of the nifty features of involute geas is that they work even if you have a incorrect distance beween gears, and also slightly wrong values just as long as it can physically fit. Feb 24, 2021 at 21:33
• Which you allways can as you can move slightly fufther. But due to tolerancing the gap tends to be larger. But it does not have to be. Feb 24, 2021 at 21:40
• I was looking at the same page today. According to it, without any profile shift, then the empty spaces along the pitch circle are equal in arc/angle/distance to the tooth thicknesses. That's also what I got from equations 14-18 on their shape calculation tutorial. Intuitively, this makes some sense when you consider that two gears of equal sizes must be symmetric, so the spaces should equal the gaps in some way. Feb 26, 2021 at 2:22