Involute Gear Cutter Question

Module cutters are also only 20 degrees where dp can be either 14.5 degrees and 20 degrees.
 
I have purchased several sets of these from Russia and China. The module gear cutters are always the opposite of the DP gear cutters. This is also true for Chinese cutters in DP sizes. In other words, a metric country made DP gear cutters using their own metric dimensions.
 
If you can get past the naming convention on foreign made DP style cutters, & have a 7/8" arbor, you can save a lot of money on cutters. USA made DP cutters for a 1" arbor are $500 for a set of 8 if a common size is sought.
 
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