I found the technique Jeff describes to be the most economical, I first tried using cemented carbides on RC60 ballscrews then found it was getting quite expensive I then switched to using a 4" angle grinder to get below the hard surface then turned them.
This resulted in getting my lathe filthy as the coolant needed between grinds turned the dust to cement, I also had to source some discs for stainless to get almost acceptable wear (stock disc 2 minutes stainless disc 5 minutes to unusable)
The very last Ballscrew I did I used the bench grinder with a fine wheel turning it by hand to get the size I wanted + 1 mm then turned it in the lathe with a small radius cemented tip and really REALLY wish I'd done them all this way! (Thanks Jeff
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