This thread show the tools used by Empu Suparman, Surakarta, prior to 1995:-
http://www.vikingsword.com/vb/showthread.php?t=6905
see page 2
all of the keris that Empu Suparman made were made with these tools.
I have made about half a dozen keris, and I used similar hand tools.
However, the makers in Solo who came from the ASKI school did use electric tools, principally angle grinders, and then later on they used dremels, dentists drills and die cutting grinders.
The man in Jogja ( I cannot mention his name) who made reproductions of genuine older classifications of keris from immediately after WWII through to about year 2000 used all hand tools, similar to those used by Empu Suparman and myself.
I believe Empu Djeno Harumbrojo used hand tools, not electric tools, but again, I never saw him working.
I do not know what tools were/are used by the Madura makers, whether in Sumenep, Aeng Tong-tong or in East Jawa on the mainland, I have never seen these makers actually working.
An afterthought:-
I just read through this entire referenced thread, actually it is worth reading through, there is one hell of a lot of good info in it.