Hello guys. In the past i was trying to reverse-engineer a spline to use with some custom pulleys, and i couldn't get a standardised spline design to work. I was certain it was an involute spline but turns out it's not. I've checked ISO, BSI, JIS, DIN nothing worked. In the end i had my manufacturing guy take the shaft to someone with a 3D scanning service and here is what i've got back:
https://www.dropbox.com/s/nuzbt3wxwc1t1q7/0110-1A.... (siemens nx file - i've actually got an STP file from them that i converted - also I've had them scan the original pulley so i have both internal and external splines)
(which worked, but probably there was some processing done to get such accurate surfaces - really interested to find out what software and hardware was used to obtain this).

Also here's the old thread i made but it had to do more with design because i was certain it was an involute spline: https://www.eng-tips.com/viewthread.cfm?qid=418272

So can someone check and tell me what type of spline it is actually?

Kind regards