Pressure Angle On Pm 1440 Change Gears

Does anyone know, of the top of their head, what the pressure angle is for these change gears? I want to order some cutters and make a few more change gears. In particular a 46 tooth gear so I can cut 11.5 tpi.
-Brian

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I did some more digging and measuring and I think these change gears have a 20° pressure angle. I would still like some confirmation before I order cutters though. Just in case anyone else would like to know the diametral pitch is 20 for these particular change gears.
-Brian

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Okay, more digging and measuring this evening and have determined that they aren't 20 diametral pitch, they are a module 1.25, 20° pressure angle. A 20 diametral pitch 20° pressure angle would probably work just fine as a change gear but I am getting the 1.25 mod hob, so they will match. Guess I should have assumed that the gearing on this machine would be metric.
-Brian

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