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Involute spline 9H Formula
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Source：Internet Author：Unknow Pubdate：2008-04-15
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Phlegyas (Automotive)
28 Sep 06 10:55
I have a Din 5480 Spline on my Blue Print N50 X 2 X 24 X 9H.
the 9H is where I can use some assistance. Is 9H the Space width tolerance? is 9 the class? (my 25 hand book only list 4-7) What is the formula that is used to calculate 9H . Any help is much appreciated
gearcutter (Industrial)
28 Sep 06 16:29
You are correct 9H is the tooth space tolerance.
To figure out how it relates to the actual measurments needed for a given pitch, pressure angle, diameter & number of teeth you'll need to get hold of the DIN5480 part 14 standard, easily obtainable via the web.
Here is a link to a calculator that may help you understand the DIN fit tolerancing system, you'll need Java to be enabled in your browser - http://www.tecnologix.net/en/tools/passungsrechner/passungsrechner_v05.html 字串6
In this case the BTL across 5 spaces would be 26.644 - 26.682 and across 3.5mm pins would be 42.673 - 42.762.
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