I have only seen hobbing of splines done on a horizontal milling machine.

What is the material being splined?  If it is steel, this will be a slow process.  Therefore you likely will want to build a special machine tool which will accommodate multiple shafts to be splined simultaneously.

Jesus is THE life,
Leonard

Have you considered rolling the splines?

30 pieces per hour for the sizes you indicated would be a walk in the park for spline rolling. Superior finish, increased surface hardness and increased productivity are all reasons my first choice would be spline rolling.

I agree, folowing further investigation spline rolling seems to be the best option.

There's also a cold extrusion option you might want to consider.  Spline rolling is pretty much an industry standard, but there are a couple "rules of thumb" that might impact its applicability to your part:

Module = 1.5 or less
Must be an involute spline
pressure angle = 30 degrees or greater

There's also a slight difference in flank geometry between the flank that was leading during forming and the one that was trailing.

If you can't live with these (not a problem in most applications), cold extrusion may be a better option.  No limit to pressure angle, no process-induced requirement for involute form, and the module limits are somewhere beyond 4.0 (at 130mm pitch dia - probably still in the 2.0 range for parts such as your shaft).

Here are a couple links:

builder of specialized axial forming machines:
http://www.felss.de/felssEnglish/siteMaschinenAxialform.html?topID=30&navID=3&navID2=8&allID=3

Cold forging production house working with external splines on shorter parts:
http://www.mfccorp.com

Good luck!